Showing posts with label take. Show all posts
Showing posts with label take. Show all posts
Sunday, December 4, 2016
How long does it take to detect array parameters
How long does it take to detect array parameters
RAID recovery time
RAID recovery time depends on both the time required to read a sample of data from a disk set and the time for analyzing the data sample and determining the array configuration parameters. However, read and analysis speeds depend on many other aspects and the resulted RAID recovery time will be limited by the worst of the components.
Statistical analysis time
The RAID recovery time depends directly on the data being analyzed. Based on some data the confident decision can be obtained immediately, while the other data can be absolutely useless for determining the parameters.
On top of that, it is practically beneficial to scan the disk not in a continuous pattern. Instead, the samples are picked randomly from a disk set.
These two factors together lead to the fact that the RAID recovery time can be different each time you run ReclaiMe Free RAID Recovery. In a successful scenario, the RAID can be recovered in minutes, in the worst case it will take several hours to complete recovery.
Disk throughput
RAID recovery involves reading a lot of data. In worst case, the entire disk set is to be read three times - for the RAID analysis, then for the filesystem analysis, and then when the files are copied out. The hardware setup affects the read speed significantly. Reconfiguring the storage subsystem can sometimes reduce recovery time by the factor of ten.
The following considerations apply:
- If you connect the disk to a SATA port on motherboard, you get 30 to 50 MB/sec throughput. A modern hard drive can deliver data faster, but realistic processing speed does not exceed 50 MB/sec with a rotational hard drive. The throughput is defined per SATA port, meaning that if you have two drives connected to SATA ports, data is processed twice as fast as long as CPU can handle it.
- If you use USB, make sure everything works in at least USB 2.0 mode. USB 1.1 is unacceptably slow for data recovery use; however, the USB 1.1 hubs are still produced. USB 3.0 devices are not very stable as of spring 2012. You should probably avoid USB 3.0 hubs till at least 2013. Anyway, if something goes wrong with an USB 3.0 device, it falls back to USB 2.0 mode, so you dont lose much.
- USB 2.0 provides about 15 MB/sec throughput per root port. If you connect several hard drives to an USB hub, their combined throughput is limited to 15 MB/sec.
- If you use multiple disk image files during RAID recovery, you should evenly distribute these image files across as many physical hard drives as possible. There is a singificant penalty associated with mechanical disk seeks if you put multiple images onto one hard drive.
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Tuesday, November 8, 2016
How to Take Care of Printer
How to Take Care of Printer
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How to Take Care of Printer |
For example, the Canon Pixma E400 printer is printing a test you have to do is to measure the alignment straight line that produced by the printer.
If it does not match expectations chardtridge head cleaning can be done, but this is very rare in the initial purchase of the printer. If the line has been dashed because of fair use and the age of the printer, then the calibration process or cleaning head can also be done to obtain good printing results.
Printers are already equipped facility, scanners, certainly not just a test print page, but it must be done at a test scanning. If this scanning process ignored the printer usually will do not oprations. This means that the step has to be done.
How to Take Care of Printer # 1:
A printer will also work with good air quality and well of course have to use original parts. One is the cartridge. It is now a lot cheaper cartridge but it risks occur in the printer and also a decrease in the age of prints. So, if we want to buy it must be smart in choosing a printer.How to Take Care of Printer # 2:
To prevent dry ink it should be at least once a week you use the printer to print the document. While the scanner is not anything to use as needed. While it is different from the ink infusion, can sometimes leak. So the printer as well as motore / car took first heat once a week if it is not often used is to avoid, in the dry ink. If you are not going to use in a very long period of time, the better Copt cartridge and store in a dry place.How to Take Care of Printer # 3:
Reduce printing with fast draft mode, if it is done regularly it will affect the quality of the head cartridge. Better to use the normal mode. May use fast draft mode but not to the light, and should not be your top choice to use that mode.How to Take Care of Printer # 4:
Use paper as needed, if the thicker the paper, the AKN more also absorb ink. Remember, recycled paper is not recommended, because the pores absorb more ink unless you use a laser printer types.How to Take Care of Printer # 5:
Do not let the small items that go into a roller printer, such as clips, staples may even small pins and coins. Roller is very sensitive because it served pull the paper, if jammed sought not pull the paper in the front and rear. The thing to do is to press the cancel button repeatedly, if you still can not be tries restart the printer to automatically seacara paper out.Hopefully can take advantage and make insight for us all.
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