Showing posts with label recovery. Show all posts
Showing posts with label recovery. Show all posts
Wednesday, December 14, 2016
RAID 0 Recovery
RAID 0 Recovery
RAID 0 Recovery
Before you rush to recover RAID 0, you need to understand the causes of RAID 0 failure. There are two different types of RAID 0 failure:
- failure of one or several RAID 0 member disks;
- failure not associated with the member disks.
RAID 0 member disk failure
Since RAID 0 arrays are non-redundant, then if one of the member disks fails, then data that was on the failed disk is lost forever. Having data from the rest of the member disks you can try to recover files. However, only the files which are smaller than (N-1)*(block size) can be recovered. Even files smaller than that limit can be unrecoverable if the part of the file happens to be on a failed disk.
So in general, if one of the member disks fails beyond repair, it is impossible to recover data from RAID 0.
RAID 0 failures not associated with the loss of the member disks
Such RAID 0 failures include operator errors, controller failures, or RAID 0 controlling software failures. In this case RAID 0 configuration metadata is lost, but the member disks are working properly.
With these failures, it is possible to recover data from RAID 0. First, you should determine the array configuration. RAID 0 configuration includes:
- number of member disks,
- disk order, along with what disk was the first in the array,
- block size,
- start offset on the disks.
Manual RAID 0 recovery
How to determine the disk order
You can determine the disk order manually relying on the long text files, preferably log-files with timestamps. For searching the disk members for such files use any disk viewer tool, like WinHex. When a fragment of a suitable file would be found on one of the member disks it is needed to track what disk contains the next fragment and etc. This way, you can determine the disk order although it is impossible to find out what disk was the first.
How to determine the first disk
It is not difficult to determine what disk was the first in RAID 0. Once again, you need to use a disk viewer tool and search the member disks for:
- MBR in case of a hardware RAID - the disk that contains the MBR is the first RAID 0 disk.
- boot sector for a software RAID 0 - the disk that contains the boot sector at the beginning is the first disk.
How to determine block size (stripe size)
For a hardware RAID 0, you can determine block size by going over the possible values or look up what block size can be used in your RAID 0 implementation in the appropriate manual.
For a software RAID 0, use the standard value. For example, Windows uses a 128 sectors block for RAID 0.
How to determine start offset on the member disks
On a hardware RAID, data most likely starts at the start of the hard drive. This is equivalent to the offset of 0 (zero).
If a software RAID is used, the offsets are in most cases identical for all member disks. The offset to the start of the volume can be identified by locating the volume boot sector.
RAID 0 recovery with software
If the manual option seems too complex and time-consuming, try the automated RAID recovery software.
There are many tools capable of automatically recovering RAID 0 on the market (check the RAID recovery software comparison). These software utilize different algorithms (not necessary such as described above) and usually such tools are relatively expensive.
We offer a fully automated and free solution for the RAID 0 recovery situations. Our software ReclaiMe Free RAID Recovery determines the array configuration parameters for RAID 0, RAID 01/10, and RAID 5 using only the data contained on the member disks. Just download ReclaiMe Free RAID Recovery then select all the available member disks (dont forget to connect them to the PC separately), start RAID 0 recovery and get the recovered RAID 0 configuration. More instructions on how to recover RAID tutorial page.
Go to link download
Monday, December 5, 2016
Data Recovery from RAID 5 to Computers failure
Data Recovery from RAID 5 to Computers failure
Introduction
So, youve ignored SAM and gone and run on a RAID 5. Then, through some elder gods handiwork, two of your disks drop off the RAID at the same time rendering your RAID 5 inaccessible. Your skin pales as you realise your last backup was *coughcough* months ago and close to useless. What to do? WHAT TO DO!?!
First things first - stop. Stop everything. Well, keep breathing, but stop everything else. Slow your mind and calm down.
Two disks dropping out of a RAID 5 simultaneously is odd. Its unlikely to be a hardware issue on both drives, so it could be a software issue.. possibly an incorrectly referenced or corrupt RAID config. If so, things may not be as bad as they seem and indeed, you may be able to recover everything.
This How-To addresses recovering data from failed RAID 5 arrays on Desktop PCs, a situation we all dread (and should avoid by running OBR 10). It is generic, and where assumptions are made they are stated.
Failing to have a recent backup is going to be expensive. Hopefully you already have the necessary hardware available to recover but if not, youll need to make a few purchases.
Depending on how the following steps pan out, you may not be successful in data recovery and you should accept that is a possibility. A lot of variables have to align to allow you to recover, but before admitting defeat stick your chin up, take a deep breath, and ... switch your PC off.
Steps (10 total)
First things first, shut your PC down.
Reason: your existing PC is a plague to your RAIDed disks at the moment, the controller can likely still access your disks and thinks its in its old raid config. While like this, there is the potential for extra writes to occur on those disks and this risk needs to be eliminated.
Keep it shut off. Dont switch it back on until you can pass the next step. Where possible, the entire RAID recovery needs to be performed in one long period without interruption.
Reason: your existing PC is a plague to your RAIDed disks at the moment, the controller can likely still access your disks and thinks its in its old raid config. While like this, there is the potential for extra writes to occur on those disks and this risk needs to be eliminated.
Keep it shut off. Dont switch it back on until you can pass the next step. Where possible, the entire RAID recovery needs to be performed in one long period without interruption.
To enable you to recover the data, youll need to have the necessary hardware.
1. A NAS or spare PC with significantly large network storage share.
Reason: an equal amount of space available somewhere else. If you had 3 x 1TB disks in RAID 5, you will need at least 3TB storage elsewhere. Likewise, if you had 5 x 3TB drives, youll need 15TB storage available on the network. This How To assumes you have a NAS with enough spare storage available, and is accessible on the network and ready for writing. Ka-ching!
Reason: an equal amount of space available somewhere else. If you had 3 x 1TB disks in RAID 5, you will need at least 3TB storage elsewhere. Likewise, if you had 5 x 3TB drives, youll need 15TB storage available on the network. This How To assumes you have a NAS with enough spare storage available, and is accessible on the network and ready for writing. Ka-ching!
2. An alternative disk connection. This can be a spare PC with spare disk ports, or an external HDD mount. This How To assumes you use a USB HDD dock
Reason: Since the RAID controller is the interface between your OS and the disks, your OS can only see the corrupted RAID, and may not even see the individual disks depending on the RAID corruption. Your disks will need to be removed from the existing controller and attached via an alternate means to a bootable Windows OS. If youre plugging them into a different PC, ensure the disk controller isnt the same model as the one controlling your failed RAID (which basically means ensure its a significantly different motherboard model). An external USB3 HDD dock is a safe bet, and not too expensive.
Reason: Since the RAID controller is the interface between your OS and the disks, your OS can only see the corrupted RAID, and may not even see the individual disks depending on the RAID corruption. Your disks will need to be removed from the existing controller and attached via an alternate means to a bootable Windows OS. If youre plugging them into a different PC, ensure the disk controller isnt the same model as the one controlling your failed RAID (which basically means ensure its a significantly different motherboard model). An external USB3 HDD dock is a safe bet, and not too expensive.
3. UPS me up, Scotty!
Reason: Youll need enough UPSs for all components during recovery. It/they need to be able to power a PC, a NAS, a switch/router and a USB HDD Dock in the event of a decent power failure. You know itll happen during this process (damn you elder gods!) so best protect against it.
Reason: Youll need enough UPSs for all components during recovery. It/they need to be able to power a PC, a NAS, a switch/router and a USB HDD Dock in the event of a decent power failure. You know itll happen during this process (damn you elder gods!) so best protect against it.
4. R-Studio Network Edition. Prepare to buy it, but not yet. Get the trial for now.
site: http://www.r-tt.com/
download: http://www.data-recovery-software.net/Data_Recovery_Download.shtml
store: https://secure.r-tt.com/cgi-bin/Store?id=1
Reason: Its the most stable, assured, and fastest RAID reconstruction/recovery tool Ive encountered (from recent experience, Jan 2013). There are other tools such as Zero Assumption Recovery that will probably suffice, but my personal recommendation is R-Studio. Since this How-To assumes youre recovering to and from a NAS or network share, the Network Edition is required. If you have uber space locally, the standard version is fine.
If you make it through to seeing your files later in this process, youll need to then purchase R-Studio, but in the meantime just download the trial. Install it.
site: http://www.r-tt.com/
download: http://www.data-recovery-software.net/Data_Recovery_Download.shtml
store: https://secure.r-tt.com/cgi-bin/Store?id=1
Reason: Its the most stable, assured, and fastest RAID reconstruction/recovery tool Ive encountered (from recent experience, Jan 2013). There are other tools such as Zero Assumption Recovery that will probably suffice, but my personal recommendation is R-Studio. Since this How-To assumes youre recovering to and from a NAS or network share, the Network Edition is required. If you have uber space locally, the standard version is fine.
If you make it through to seeing your files later in this process, youll need to then purchase R-Studio, but in the meantime just download the trial. Install it.
5. ReclaiMe Free RAID Recovery
site: http://www.freeraidrecovery.com/
download: http://www.freeraidrecovery.com/download.aspx
Reason: This automates finding the correct parameters for reconstructing a virtual RAID, and gives clear and concise R-studio instructions when finished. And its free! If youre handy with a hex editor, you can ignore this program and follow the R-Studio tutorials on finding RAID parameters (http://www.r-tt.com/Articles/Finding_RAID_parameters/). This How To assumes youre using this program, so install it.
site: http://www.freeraidrecovery.com/
download: http://www.freeraidrecovery.com/download.aspx
Reason: This automates finding the correct parameters for reconstructing a virtual RAID, and gives clear and concise R-studio instructions when finished. And its free! If youre handy with a hex editor, you can ignore this program and follow the R-Studio tutorials on finding RAID parameters (http://www.r-tt.com/Articles/Finding_RAID_parameters/). This How To assumes youre using this program, so install it.
Youre about to pull your PC apart and take those failed drives out. At this point, I recommend documenting everything and labeling cables and drive placements. Its not entirely necessary but its good to know what connected to what and where if you ever want to escalate this to a forensic Data Recovery Center. The more info the better.. and the cheaper.
Once documented, anti-static yourself and carefully remove your failed RAID drives.
Once documented, anti-static yourself and carefully remove your failed RAID drives.
One by one youll need to verify the physical integrity of your drives by running your vendors checking utilities.. e.g:
IBM/Hitachi -- Drive Fitness Test
SeaGate -- SeaTools
Western Digital -- WD Diagnostics/Lifeguard
So, plug in each drive to the dock and run the tests. DO NOT ATTEMPT ANY REPAIRS, run this in read-only mode ONLY. A random write to the could wipe out your chances of recovery. We just want to make sure your drives are physically OK.
If two disks fail because of a mechanical issue or your drives are dead, unfortunately youre hosed. Nothing to do except take it to a Data Recovery Centre. Youre probably looking at around $1,000 per recovered disk to get the experts to do it. Sorry, but this is by and large your only shot from here.
If one disk fails and the rest are fine you still have a shot. Continue.
If none fail and all your disks are fine, great! Continue!
IBM/Hitachi -- Drive Fitness Test
SeaGate -- SeaTools
Western Digital -- WD Diagnostics/Lifeguard
So, plug in each drive to the dock and run the tests. DO NOT ATTEMPT ANY REPAIRS, run this in read-only mode ONLY. A random write to the could wipe out your chances of recovery. We just want to make sure your drives are physically OK.
If two disks fail because of a mechanical issue or your drives are dead, unfortunately youre hosed. Nothing to do except take it to a Data Recovery Centre. Youre probably looking at around $1,000 per recovered disk to get the experts to do it. Sorry, but this is by and large your only shot from here.
If one disk fails and the rest are fine you still have a shot. Continue.
If none fail and all your disks are fine, great! Continue!
One by one, assuming your disks are physically fine, you need to use R-studio to take disk images of your failed RAID drives. If any disks failed the integrity check in Step 4, dont image those as it can corrupt the overall integrity of the virtual RAID later on - only image your physically OK disks.
To do this:
- ensure you have a Mapped Drive to your NAS or network storage share. This How To will assume you labeled it S: (R-Studio didnt like using UNC paths to take images)
- attach a HDD to the USB dock and ensure its powered up and visible in Windows (if not readable).
- open R-Studio
- in the drive list on the left, right-click your failed drive and select "Create Image"
- in the popup window, Main Tab, select Byte-to-Byte image, and for the Image Filename, rename it to be unique and on the mapped network share (e.g. "S:disk-01.dsk")
- click OK and wait until finished (could be hours to days)
- repeat for all disks, uniquely naming each image file on the file share.
To do this:
- ensure you have a Mapped Drive to your NAS or network storage share. This How To will assume you labeled it S: (R-Studio didnt like using UNC paths to take images)
- attach a HDD to the USB dock and ensure its powered up and visible in Windows (if not readable).
- open R-Studio
- in the drive list on the left, right-click your failed drive and select "Create Image"
- in the popup window, Main Tab, select Byte-to-Byte image, and for the Image Filename, rename it to be unique and on the mapped network share (e.g. "S:disk-01.dsk")
- click OK and wait until finished (could be hours to days)
- repeat for all disks, uniquely naming each image file on the file share.
So, youve physcially checked your disks and theyre OK. Youve successfully created images of those disks and theyre ready on the network. Now the clincher - you need to find if the RAID is able to be deciphered.
Close R-Studio
Open ReclaiMe Free RAID Recovery.
- Click on the drop-down arrow on the Disks icon up the top and select "Open disk image"
- Navigate to your NAS share and select all your uniquely named .dsk files you just made in R-Studio.
- back at the main screen, tick the checkboxes next to each of your disk images.
- click the big green Start RAID 5 icon up the top.
- let it do its thing. This step can take hours or days, or even weeks. For 4 x 2TB images it took 2 days on my system. Let it be and try to keep anything away from the PC and NAS and router/switch while it runs.
Close R-Studio
Open ReclaiMe Free RAID Recovery.
- Click on the drop-down arrow on the Disks icon up the top and select "Open disk image"
- Navigate to your NAS share and select all your uniquely named .dsk files you just made in R-Studio.
- back at the main screen, tick the checkboxes next to each of your disk images.
- click the big green Start RAID 5 icon up the top.
- let it do its thing. This step can take hours or days, or even weeks. For 4 x 2TB images it took 2 days on my system. Let it be and try to keep anything away from the PC and NAS and router/switch while it runs.
There is a "Confidence" meter shown during analysis. If this gets to 100% before the "Progress" meter then things are looking good. If the Progress meter gets to 100% while Confidence is low, the amount of data you can recover is diminished, if any. For RAID data recovery, as in life, high Confidence is what youre after.
When finished, ReclaiMe will give you instructions for R-studio. Copy it into a document and save/print it for reference later.
When finished, ReclaiMe will give you instructions for R-studio. Copy it into a document and save/print it for reference later.
Using the instructions given to you by ReclaiMe, follow them exactly. And by exactly, I mean exactly.
Heres an example what youre likely to have:
-------------------------------------------------------
These instructions are provided for R-Studio version 5.1
1. Launch R-Studio
2. On the toolbar, click "Open image". Enter "S:ST2000DM001-9YN164CC4C-Disk3.dsk" as the file name, click "Open"
3. On the toolbar, click "Open image". Enter "S:ST2000DM001-9YN164CC4C-Disk1.dsk" as the file name, click "Open"
4. On the toolbar, click "Open image". Enter "S:ST2000DM001-9YN164CC4C-Disk2.dsk" as the file name, click "Open"
5. On the toolbar, click "Create Virtual RAID". Then, select "Create Virtual Block RAID" from the dropdown menu.
6. Right click the disk list on the right, select "Add S:ST2000DM001-9YN164CC4C-Disk3.dsk" from the pop-up menu.
7. Right click the disk list on the right, select "Add S:ST2000DM001-9YN164CC4C-Disk1.dsk" from the pop-up menu.
8. Right click the disk list on the right, select "Add S:ST2000DM001-9YN164CC4C-Disk2.dsk" from the pop-up menu.
9. On the right side of the R-Studio window, set "RAID type" to "RAID5".
10. Below that, set "Block size" to "64 KB".
11. Below that, set "Block order" to "Left Asynchronous".
12. In the "Parents" table, enter "0 Sectors" as "Offset" in all rows.
13. Below the RAID diagram, click "Apply".
14. On the left panel, "Virtual Block RAID 1" is the newly created RAID. Double click it to start recovery.
Generated by ReclaiMe Free RAID Recovery build 889, www.FreeRaidRecovery.com
-------------------------------------------------------
Notice that the order in which you load drive images is not sequential, nor is it when you add the images to the Virtual Block RAID. Perform the steps as instructed in the order it advises.
Heres an example what youre likely to have:
-------------------------------------------------------
These instructions are provided for R-Studio version 5.1
1. Launch R-Studio
2. On the toolbar, click "Open image". Enter "S:ST2000DM001-9YN164CC4C-Disk3.dsk" as the file name, click "Open"
3. On the toolbar, click "Open image". Enter "S:ST2000DM001-9YN164CC4C-Disk1.dsk" as the file name, click "Open"
4. On the toolbar, click "Open image". Enter "S:ST2000DM001-9YN164CC4C-Disk2.dsk" as the file name, click "Open"
5. On the toolbar, click "Create Virtual RAID". Then, select "Create Virtual Block RAID" from the dropdown menu.
6. Right click the disk list on the right, select "Add S:ST2000DM001-9YN164CC4C-Disk3.dsk" from the pop-up menu.
7. Right click the disk list on the right, select "Add S:ST2000DM001-9YN164CC4C-Disk1.dsk" from the pop-up menu.
8. Right click the disk list on the right, select "Add S:ST2000DM001-9YN164CC4C-Disk2.dsk" from the pop-up menu.
9. On the right side of the R-Studio window, set "RAID type" to "RAID5".
10. Below that, set "Block size" to "64 KB".
11. Below that, set "Block order" to "Left Asynchronous".
12. In the "Parents" table, enter "0 Sectors" as "Offset" in all rows.
13. Below the RAID diagram, click "Apply".
14. On the left panel, "Virtual Block RAID 1" is the newly created RAID. Double click it to start recovery.
Generated by ReclaiMe Free RAID Recovery build 889, www.FreeRaidRecovery.com
-------------------------------------------------------
Notice that the order in which you load drive images is not sequential, nor is it when you add the images to the Virtual Block RAID. Perform the steps as instructed in the order it advises.
Also, the last step (14) is slightly misleading. Double-click on the "Basic data partition" listed beneath the root Virtual Block RAID (rather than the "Virtual Block RAID 1" itself), and that will begin recovery.
The process of mapping the Virtual Block RAID is quite fast in comparison to what youve done so far, just a few minutes after beginning youll be presented with a data recovery screen that lists all the folders/files that it could find.
In the R-Studio "File View" window, the folder list on the left, expand the Basic Data Partition, expand the Root.
This lists all the folders/files that it could find. Hopefully for you, it lists a lot.. maybe even everything!
Time to test a single file recovery:
- navigate your folder list and find a file youd really like but that isnt too big,
- select it by ticking the checkbox beside it
- click the "Recover Marked" icon up the top and follow the prompts as to where youd like to save the file.
Sometimes recovering files can take some time. For me I recovered about 1.5TB per day across the network, but it could differ for you.
Test the recovered file - if its complete and satisfactory, make sure youve saved the instructions from ReclaiMe on how to set up the Virtual Block RAID for R-Studio.
This lists all the folders/files that it could find. Hopefully for you, it lists a lot.. maybe even everything!
Time to test a single file recovery:
- navigate your folder list and find a file youd really like but that isnt too big,
- select it by ticking the checkbox beside it
- click the "Recover Marked" icon up the top and follow the prompts as to where youd like to save the file.
Sometimes recovering files can take some time. For me I recovered about 1.5TB per day across the network, but it could differ for you.
Test the recovered file - if its complete and satisfactory, make sure youve saved the instructions from ReclaiMe on how to set up the Virtual Block RAID for R-Studio.
If successful, its time for you to purchase R-Studio Network Edition.
store: https://secure.r-tt.com/cgi-bin/Store?id=1
store: https://secure.r-tt.com/cgi-bin/Store?id=1
Its also time for some semi-drastic, but highly recommended action....
Youre ready to recover your data from the NAS to your PC, so youll need your disks back in your PC.
So to start off, close everything and shut down cleanly.
At this stage you should reconsider using a RAID 5 - it is inherently fragile for current drives (read up on some of Spiceworks SAMs posts on this). Where possible grab yourself an even number of disks, buy another one if you have an odd amount, and rebuild your RAID as a RAID 10.
So, take all your disks to the original PC, plug them all back (I do it in order that I took them out, but its of no consequence now), and start er up.
Jump into your RAID config and remove all existing RAID settings and create a new RAID 10 with all drives. RAID 10 is really the way to go. Its highly recommended.
This will destroy all data on your disks so just in case, keep your NAS running to minimise risk of corruption on restarts.
Also, if youve been using FakeRAID (RAID run by the motherboard controller) consider getting yourself a proper RAID card and running your drives from there. If the controller goes on the fritz, you could be paddling without a .. paddle ..
Wait until the new RAID 10 is configured and initialised and boot into Windows.
Following Step 7, get back into R-Studio and rebuild the Virtual Block RAID so that you can see all your files again.
Restore at will to your PC, back to whence they came.
Now that you have all the data you want back, time to do some housecleaning.
If you have the space, perform a backup now. If you need, you can delete the images of your disks off the NAS first, but only if absolutely necessary and youre confident that you wont lose anything.
Get a backup system in place, preferably automated. That means if you lose a RAID again its of no consequence due to having recent backups. Check your backups often to ensure theyre being taken successfully.
You maybe used to think you didnt need backups. I hope youve learned this is not the case.
So, in the wise words of every moderator in Spiceworks, "Backup, backup, backup"
"And ... backup"
"And ... backup"
Go to link download
RAID 1E Recovery
RAID 1E Recovery
RAID 1E Recovery
There are several subtypes of RAID 1E: near, far, and interleaved (see the RAID 1E diagrams). Regardless of the subtype, the RAID 1E metadata includes number of member disks, disk order, block size, and start offset on the disks. ReclaiMe Free RAID Recovery can detect RAID1E far parameters automatically. However, first you need to turn your RAID 1E to RAID 0 by truncating a half of the array using HPA and then recover the array as described below.
RAID 1E recovery with software
Before you start RAID 1E recovery consider creating disk image files (sector-by-sector copy of the disk content) if you suspect that one or several member disks are physically damaged.
- Download and start ReclaiMe Free RAID Recovery software.
- Select all the availbale RAID 1E member disks or disk image files. You can create or load disk image files using Disks button. Note that ReclaiMe Free RAID Recovery can only recover a RAID 1E with all disks present.
- Click Start RAID 0.
- Wait until ReclaiMe Free RAID Recovery detects the RAID 1E configuration.
- The restored RAID 1E configuration parameters will be displayed and then you can select any of the offered output options to finish recovery:
- Run ReclaiMe to recover data. Selecting this option you launch ReclaiMe data recovery software which will investigate filesystem structure and recover files and folders based on the restored RAID 1E configuration.
- Save layout to file (RAID XML). The recovered RAID 1E configuration parameters will be written to the file in XML format. This file can then be opened in ReclaiMe data recovery software to recover data off the array.
- Create the array image file, for later use with some other data recovery software, if you suspect there is a filesystem damage as well.
- Write array to disk, so that you can just plug it to the system and access the data. In some cases, however, the partition table has to be reconstructed before data can be accessed.
- Use with other data recovery software. This option allows you to transfer the recovered RAID1E configuration to most common data recovery tools. Note that the transferring instructions useRAID0 layout rather than RAID1E.
Alternative RAID 1E recovery options
Instead of using HPA to reduce RAID1E far member disks, you can create regions on the disks in professional data recovery software like ReclaiMe Pro and then try different recovery options.
Go to link download
Tuesday, November 8, 2016
RAID 6 Recovery
RAID 6 Recovery
RAID 6 Recovery
RAID 6 parameters
RAID 6 layout utilizes two different parity functions which helps a RAID 6 array survive up to double disk failure. Despite of the fact that RAID6 is perceived to be more reliable than a RAID 5, the probability of a controller failure is the same. So if your RAID6 fails, this will most likely be due to a controller failure. To recover a RAID6 from a controller failure, you need to know or recover the following parameters:
- number of member disks
- disk order and which disk was the first in the array
- block size
- start offset on the member disks
- positions of each parity function
- rotation of parity functions
- algorithm used to calculate the second parity function
- pattern of parity functions
You should know all these parameters to reconstuct RAID 6 successfully. Our software ReclaiMe Free RAID Recovery (download) can recover RAID6 configuration automatically. See the step-by-step RAID Recovery instructions.
RAID 6 variations
RAID 6 is significantly more complex than RAID 5.
- The first parity function (XOR, denoted as P on the diagrams) naturally comes from RAID5. However, there is no widely accepted standard for the second parity function (Q). Typically, a Reed-Solomon code or some variation thereof is used.
- Reed-Solomon code depends on the order in which input is provided. This produces four more variations: left-to-right or right-to-left and if P or Q is calculated first.
- There are several variations of layout accomodating two parity functions.
Missing disk limitations
Maximum of one missing disk is allowed. Although RAID 6 should be recoverable with two disks missing, the implementation of ReclaiMe Free RAID Recovery cannot work with two disks missing.
With Promise hardware RAID 6, no missing disks are allowed at all (as of build 381).
Go to link download
Monday, November 7, 2016
RAID recovery limitations
RAID recovery limitations
ReclaiMe Free RAID recovery limitations
There are either general limitations concerning all the types of RAID array like the requirement to have the same offset of data on the member disks or specific limitations applied to a particular RAID layout.
General limitations
- If the array data is stored not from the very start of the disk, but with a certain offset, the offset is required to be the same on all disks. All known hardware controllers and NAS devices satisfy this requirement.
- A disk set should belong to a single array. If there were several arrays on a set of disks, then it is required that one of the arrays should be significantly larger than others. A NAS device contains operating system data (usually Linux or sometimes Windows Embedded) on the same disks. Nevertheless, it is possible to recover RAID because operating system data takes up much less space on the array as compared to user data.
- It is impossible to recover empty or almost empty array using ReclaiMe Free RAID Recovery software. The less data is stored on the array, the more time it takes to complete the analysis, and the less reliable RAID configuration parameters are derived. Each member disk, including missing disks in RAID5/6/10/1E, must contain at least 10-20GB of data.
- Allowed block sizes are from 0.5KB (512 bytes, one sector) to 1MB.
Layout-specific limitations
RAID 0 - It is required to have all the member disks.
RAID 10
- Generally, a RAID10 survives a multiple disk failure without data loss. However, a disk set must contain at least one copy of each data block.
- ReclaiMe Free RAID Recovery is capable of recovering RAID 10 near and interleaved.
- If an array is almost empty (less than 30% filled with data), recovery time and memory use may increase significantly.
RAID 1E
- ReclaiMe Free RAID Recovery can recover only RAID 1E far arrays.
RAID 10 far and RAID 1E far
These RAID layouts consist of two different RAID0 arrays of the same size which are located on the same disk set one by one. If all the member disks are available, it is possible to use HPA/DCO to reduce size of disks in half and then recover RAID0 from the visible part of disks.
RAID 5 and RAID 5E
- One member disk may be missing.
- An array must be one of the following layouts:
- synchronous left,
- synchronous right,
- asynchronous left,
- asynchronous right.
- It is not allowed to have parity shift other than by one column per row.
- ReclaiMe Free RAID Recovery software recovers configuration parameters for the arrays with delayed parity. Allowed delay values are from 2 to 32 including those values that are not powers of two.
- RAID 5 must use even parity, i.e. XOR of all bits in a complete row (including parity bit) must be zero.
RAID 6
- ReclaiMe Free RAID Recovery only supports RAID6 based on Reed-Solomon parity function (Q). Certain controllers use their proprietary methods of calculating parity, like Vertical XOR. The list ofincompatible controllers includes, but may be not limited to
- Adaptec RAID 3405, 3805, 3085, 31205, 31605, ICP5045BL, ICP5085BL, ICP5805BL, ICP5125BR, ICP6165BR,
- Adaptec RAID 4800SAS, 4805SAS, ICP9085LI, ICP5085BR,
- Adaptec SATA II RAID 2420SA, 2820SA, ICP9047MA, ICP9087MA,
- Adaptec SCSI RAID 2130SLP, 2230SLP, ICP9014RO, ICP9024RO.
- Depending on how second parity function (Q) is calculated, sometimes all member disks are required (for RAID6 built using a Promise controller). In other cases, no more than one member disk may be missing.
- Despite of the fact that RAID6 survives failure of two member disks, ReclaiMe Free RAID Recovery is not able to recover RAID configuration parameters in this case.
- RAID 6 analysis requires a lot of computation and ReclaiMe Free RAID Recovery can use up to eight CPUs or cores, if available.
Hot spare
Hot spare drives must not be included in the list of analyzed disks. The only exception is RAID 10 for which hot spare presence doesnt influence the result of RAID recovery.
Special cases
ReclaiMe Free RAID Recovery works in some exotic cases, when other software does not:
- Delayed parity which is widely used on HP SmartArray controllers.
- RAID 5 with block size of one sector (JMicron JMB393 SATA port multiplier and other similar hardware RAID controllers).
- Promise RAID 6 with its awesome Q function computation.
- Promise RAID 1E interleaved.
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Wednesday, November 2, 2016
RAID10 recovery
RAID10 recovery
RAID10 recovery
Despite of the fact that RAID 10 has most overhead among standard RAID layouts, it is subject to various breakdowns like disk failure, controller failure, and operator errors.
To recover RAID10 array you need to either pick up the disks forming RAID0 and then proceed with a RAID0 recovery, or to use ReclaiMe Free RAID Recovery software and get the array configuration parameters automatically.
Manual RAID10 recovery
In order to reconstruct the parameters for a RAID10 (start offset, block size, disk order, and first disk) first you need to exclude member disks which contain the same data. To get rid of the excessive disks you can use any disk editor software which helps you to compare content on disks.
The remaining disks form a RAID0 array; therefore you need to proceed with recovery as described in theRAID0 recovery page.
RAID10 recovery with software
Nowadays, ReclaiMe Free RAID Recovery is the only software which is capable of recovering RAID 10 configuration automatically. All you need to do is to connect all the available RAID10 member disks to a PC directly, launch RAID10 recovery and follow the instructions below.
- Download and install ReclaiMe Free RAID Recovery software.
- Select all the available RAID10 member disks.
- Click Other RAIDs button and select Start RAID10 or 01.
- Once RAID recovery is completed, select one of the following output options depending on what you want to get:
- If you want to recover data files by files from the RAID10 array, then click Run ReclaiMe to recover data button.
- If you want to save the recovered array parameters in order to recover data later click Save layout to file (RAID XML) button.
- If you want to extract data using some other data recovery software see at the Use with other data recovery software section. Note that the instructions are provided only for the software which is capable of recovering data from RAIDs. Otherwise you need to click Create the array image file first and then feed it to data recovery software.
- If you are sure that the filesystem on the RAID10 array is not damaged you can try to get access to the array data. To do this click Write array to disk. However, in some cases you might have to reconstruct a partition table before accessing the data.
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Compatibility with other data recovery software
Compatibility with other data recovery software
Compatibility with other data recovery software
Unfortunately, there is no standard format to input the RAID parameters to data recovery software. In addition, no data recovery tool we know of has an ability to load .XML file with the RAID parameters.
Due to lack of a common standard, we have developed our own elements and attributes for the .XML file to which all the recovered RAID parameters are saved.
So we have implemented a feature to ReclaiMe Free RAID Recovery to provide the detailed instructions on how to transfer the recovered array parameters to most known RAID-capable data recovery software.
As of now, the step-by-step instructions are available for R-Studio, File Scavenger, UFS Explorer, and Zero Assumption Recovery software. If you have some other data recovery software and need the instructions,
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Sunday, October 30, 2016
RAID recovery software comparison
RAID recovery software comparison
RAID recovery software comparison
We tested the most well-known RAID recovery software to see how they perform in an almost real-life environment. The following tools were tested:
- DiskInternals - DiskInternals Raid Recovery version 2.7
- Runtime - Runtime RAID Reconstructor version 4.02
- ReclaiMe RAID - ReclaiMe Free RAID Recovery build 301
- R-Studio - R-Studio version 5.1
- ZAR - Zero Assumption Recovery version 8.5
There were a couple of others which did not make it to our RAID recovery review because we were not able to make them work at all.
It should be noted that R-Studio is not a RAID recovery software. R-Studio can only work with healthy arrays or if you provide the RAID configuration parameters. Considering that the RAID-capable recovery tools are few and far between, we still decided to include R-Studio into our RAID recovery software test.
| Parameter | DiskInternals | Runtime | ReclaiMe RAID | R-Studio | ZAR |
|---|---|---|---|---|---|
| RAID types1 | RAID 0, RAID 5 | RAID 0, RAID 5 | RAID 0, RAID 5 | RAID 0, RAID 5, RAID 4, RAID 6 | RAID 0, RAID 5 |
| Maximum number of disks2 | No data | Up to 14 | Unlimited | Unlimited | Unlimited |
| Missing disk in RAID 5? | No3 | Yes | Yes | Yes | Yes |
| Delayed parity support? | No data | No | Yes | Yes | No |
| Ease of use | Complicated | Easy | Easy | Complicated | Moderate |
| Efficiency | Low. We were not able to rebuild any but the very basic test disk sets. | Good4 | Good | N/A | Good but slow |
| Output capabilities5 |
| Recovered files | Recovered files | ||
| List price | $249.95 | $99 | Free | $79.99 | $59.95 ($29.95 on weekends) |
Notes
Note 1
RAID 10 and RAID 01 are supported in all cases as a special case of RAID 0.
RAID 10 and RAID 01 are supported in all cases as a special case of RAID 0.
Note 2
Vendor-provided information, not actually tested.
Vendor-provided information, not actually tested.
Note 3
Surprisingly true.
Surprisingly true.
Note 4
Requires certain non-default settings to work effectively. It is often required to increase the number of sectors to scan or probe at least by the factor of ten.
Requires certain non-default settings to work effectively. It is often required to increase the number of sectors to scan or probe at least by the factor of ten.
Note 5
All the software is capable of creating the array image files, although maybe through a complicated procedure.
All the software is capable of creating the array image files, although maybe through a complicated procedure.
Note 6
Runtime RAID Reconstructor provides array parameters as a textual description.
ReclaiMe Free RAID Recovery provides array parameters as an XML file to use with ReclaiMe data recovery software, or as instructions to use with either R-Studio or ZAR.
Runtime RAID Reconstructor provides array parameters as a textual description.
ReclaiMe Free RAID Recovery provides array parameters as an XML file to use with ReclaiMe data recovery software, or as instructions to use with either R-Studio or ZAR.
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ReclaiMe vs ReclaiMe Free RAID Recovery
ReclaiMe vs ReclaiMe Free RAID Recovery
Difference betweeen file recovery and RAID recovery
File recovery software aims to recover data from the broken filesystems and the result of data recovery is files and folders. The goal of RAID recovery is to find out the lost RAID configuration parameters.
We have developed both data recovery software (ReclaiMe File Recovery) and RAID recovery software (ReclaiMe Free RAID Recovery).
ReclaiMe File Recovery is a multipurpose data recovery software which
- Works with a single drive or partition.
- Recovers damaged filesystem.
- Produces files and folder structure.
ReclaiMe Free RAID Recovery is a tool to reconstruct a failed RAID which
- Works with multiple hard drives (RAID member disks).
- Recovers RAID parameters.
- Produces either a destriped array data as the image file, or the array parameter set.
Do I need the RAID recovery?
In some cases, it is obvious that there is a RAID failure. An extreme case would be a RAID controller card with visible burnt components, for which no replacement is available. Or, the RAID controller reports a double hard drive failure in a RAID5 and refuses to bring the array online.
There are other cases when the RAID recovery is not needed. First and foremost, the RAID recovery is not needed when there was no RAID. Surprisingly, the RAID recovery is not needed for a RAID1 (mirror). Mirror just holds two identical copies of data. Put either of the hard drives into the working machine and data should be readily accessible. In the worst case, youd need ReclaiMe File Recovery, but no RAID recovery is ever needed for a RAID1.
There are however cases when the exact nature of the problem is not obvious. For example, a volume may refuse to mount due to either a filesystem problem or an underlying RAID problem. If the RAID-related origin of the problem cannot be positively determined, the best is to leave the RAID setup as it is and try the filesystem recovery first. The RAID recovery, which involves disconnecting the drives from the controller, should only be attempted if the filesystem recovery of the array "as is" is not successful.
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Friday, October 28, 2016
RAID 5 recovery
RAID 5 recovery
RAID 5 recovery
In order to recover RAID 5 first you need to determine RAID 5 configuration parameters and then recover data.
RAID 5 array configuration consists of:
RAID 5 array configuration consists of:
- how many disks were in the RAID 5
- what was the disk sequence
- what block size was used in the array
- at what offset the array data began
- what the parity pattern was used in the RAID5
- in you deal with RAID 5 with delayed parity you need to know the parity delay pattern as well
- in case of RAID5E and RAID5 EE you need to know how spare blocks are located on the array
All these parameters can be determined both manually and automatically. However, if you decide to recover the RAID 5 configuration manually you should be aware that this will be a very long and tedious process which requires special techincal skills.
Manual RAID 5 recovery
The information on how to determine the array parameters manually is given on a RAID 0 recovery page. Unlike RAID 0, RAID 5 is a redundant array and stores the parity data. You need to determine the parity position and rotation as well to get the full configuration of your array.
How to determine parity position
The parity placement is controlled by two parameters, parity position and rotation as illustrated below. To determine the parity position you should look over each of array blocks. A block that looks most unlike data is the parity block.
RAID 5 recovery with software
If the manual option seems too complex and time-consuming, try ReclaiMe Free RAID Recovery software.
- Download and launch ReclaiMe Free RAID Recovery tool.
- If it is needed, open or create disk image files of the RAID 5 member disks using the Disks button.
- Select all the available member disks and click Start RAID 5. You should select at least two disks. Note that ReclaiMe Free RAID Recovery software is capable of recovering a RAID 5 with one disk missing.
- The RAID 5 recovery finishes when either Scan or Confidence progress is completely filled.
- When the RAID 5 configuration parameters are restored, you should select one of the following:
- Run ReclaiMe to recover data. If ReclaiMe data recovery software has been already installed on the computer, then it is launched in RAID recovery mode and displays the partitions on the array. If you do not have ReclaiMe, you will be offered to download ReclaiMe data recovery software.
- Save layout to the XML file. Save the recovered array parameters to the file in XML format. Note that you can open this file in ReclaiMe and start to recover data off the array using ReclaiMe RAID recovery mode.
- Use with other data recovery software. Provides step-by-step instructions on how to transfer the recovered parameters to certain well-known data recovery tools. Note that the instructions are created for each particular case of RAID and you should follow them exactly. Should the need arise, the instructions can be copied to the clipboard using Copy to the clipboard button.
More info on what to do before you start to recover your RAID 5 and more detailed instructions are provided on the how to recover RAID tutorial page.
If you want to try something else, there are other tools capable of automatically recovering RAID 5 on the market (check the RAID recovery software comparison). These software utilize different algorithms (not necessary such as described above) and usually such tools are relatively expensive. We offer a fully automated and free solution for the RAID 5 recovery situations. Our software ReclaiMe Free RAID Recovery determines the array configuration parameters for RAID 0, RAID 01/10, and RAID 5 using only the data contained on the member disks. Just download ReclaiMe Free RAID Recovery then select all the available member disks (dont forget to connect them to the PC separately), start RAID 5 recovery and get the recovered RAID 5 configuration. More instructions on how to recover RAID tutorial page.
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Friday, October 7, 2016
How To Root QMobile A10 A8 A500 A600 A950 Install Custom Recovery
How To Root QMobile A10 A8 A500 A600 A950 Install Custom Recovery
The origin method we are going to mention here is quite easy and after that we will guide you to install made-to-order Recovery in your telephone. This will endow to install made-to-order ROMs in your teletelephone and Enjoy most of it.
Disclaimer: The software packages provided here are not our development , so , if anything proceeds wrong we will not be held to blame.
You just need to Take care of few things while applying this method. Make certain you take following precautions.
- Make certain your phone is more than 60% or more charged.
- Make certain your phone’s drivers are absolutely established in your PC, Download it from here
- Turn On USB Debugging. From android Developers Settings.
HOW TO Root Your Qmobile?
Few things you need to download first are
- Download and establish Drivers for window before you start the process. You can use official suite of QMobile to establish drivers for your phone in your PC.
- Download Root package and extract it on desktop. recall the title of folder in which you have extracted these documents.
Method
- Connect your telephone to PC via USB twisted cord.
- Go to the folder where you have kept the extracted documents on desktop and find a file with title of “RUN.BAT”. twice click it to run it.
- A cmd window will open asking you to enter a choice. You should go in “1? and then press go in. Wait for the method to complete. After that your teletelephone will Reboot Automatically.root-qmobile-a10-a5
- Enjoy with your rooted Qmobile.
HOW TO Install custom Recovery:
- Proceed to the proceedogle playstore from your mobile. seek and establish ” MTK Mobile Uncle Tools”.
- Download Custom Recovery for your wireless and extract the downloaded documents in your PC.
- Go to the extracted documents where you will find a file entitled as “rec0very.img”. attach your to PC via USB twisted cord and move this File in SD business business business card of your telephone.
- Now proceed to App sliding shelf of your phone and Run “MTK wireless Uncle devices” and choose recovery revise option.
- Select “rec0very.img” from your SD business business card and wait for the process to complete . After that your teletelephone will have Root access with made-to-order Recovery establish. relish It ! and give us your feedback.
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Saturday, October 1, 2016
ReclaiMe Free RAID Recovery toolbar buttons Disks
ReclaiMe Free RAID Recovery toolbar buttons Disks
ReclaiMe Free RAID Recovery toolbar buttons
Disks
When you click the button, the window with three columns, Device name, Capacity, and Serial number, is displayed.
For the physical disks in the Device name column, "Disk N" will be displayed, where N is the disk number as listed in Disk Management, along with the disk model name. The Serial number contains a serial number for each physical disk connected to the computer.
For the devices connected via USB, in the Capacity column near the size value, "[USB]" will be displayed. In most cases, no serial number is available.
For the disk image files the full disk image file name is displayed in the Device name column. The Serial number column is blank.
Open disk image
Allows you to open the previously created disk image file of the RAID member disk.
Create disk image
Allows you to create the disk image file of the member disk and save it to the specified location.
Start RAID 0
The button becomes available when you select a minimum of two member disks. By clicking the button, recovery of the RAID parameters for RAID 0, RAID 0+1, and RAID 1+0 is launched.
Start RAID 5
You need to select a minimum of two member disks to enable the button. Although RAID 5 requires a minimum of three disks, ReclaiMe Free RAID Recovery software is capable of recovering the parameters for RAID 5 with one missing member disk, based on the array redundancy.
Note that once the RAID recovery process is started, only Stop and Help buttons are active. Keep in mind that clicking the Stop button returns to the disk list, and all the results are discarded.
Other RAIDs
Click this button if you want to recover RAID10, RAID5E or RAID6. You need to select at least two disks for RAID5E recovery, and three disks for RAID10 and RAID6 recovery.
Stop
When you launch the program, the button is disabled. It becomes available only when recovery of the array parameters is started. Clicking the button results in the program returns to the disk selection tab, but not to the results.
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Wednesday, September 28, 2016
Photo Recovery 3 0 2 1 Free Download Full vesion with Serial Keys
Photo Recovery 3 0 2 1 Free Download Full vesion with Serial Keys
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Photo Recovery 3.0.2.1: It can recover all deleted, formatted, lost and inaccessible photos, videos, and audio files from digital camera, memory card, USB drive, internal hard drive and other storage devices within a few mouse clicks.A nice digital photo recovery for both newbie and experts with no tech skills required.
Key Features & Benefits of Photo Recovery:
- High Quality and Security – High fidelity, no compression on your photos and no any further damage or overwriting to your data.
- Deep Scan – Recover photos that even overwritten or cannot be recovered found by other recovery tools to get complete photo recovery with intelligence.
- Precise Photo Recovery – File type options and file size filter can narrow the scan scope and help you find your target file effectively.
- Preview Ability – Preview thumbnail lets you preview all the recoverable photos, enjoy precise photo recovery and evaluate recovery quality in advance.
- Automatic Classification – All recoverable photos, videos and audio files are classified automatically according to formats to save you much time.
- Easy-to-use – Retrieve pictures within only 3 simple steps, just as easy as counting 1-2-3. No any recovery skills needed.
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