Raid-5 data recovery

A

ayurganov2011-01-11 16:22:01

RAID

ayurganov, 2011-01-11 16:22:01

As I understand it, if at least one disk breaks when using Raid-5, then you will have to restore all the data.
Is it so?

How to recover data from Raid-5?

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4 answer(s)

B

BasilioCat, 2011-01-11
@BasilioCat

When assembling the array, I recommend that you provide one spare (spare) disk and enable automatic rebuilding of the array - in the event of a failure of one disk, the array will be in degraded mode, but will immediately start rebuilding to a spare disk. Also, if the controller allows, you can turn on the so-called. disk scraping - during periods of least activity, the raid will read the entire contents of each disk for errors - this reduces the likelihood that when one disk crashes and the array is rebuilt (in this case, all disks will be read), another disk will be added due to for increased load. This feature is not available on all hardware controllers.

K

Konstantin Vlasov, 2011-01-11
@CaptainFlint

No, the data will be intact. It will only be necessary to rebuild the array after replacing the failed disk with a new one in order for the data to become consistent.

X

XaBoK, 2011-01-11
@XaBoK

I can only add that the process of restructuring can be long. In case of failures of the seven (the problem of Intel firewood for 64bit), 2tb were built for 19 hours. Although at this time you can continue to work. Just do not forget that if two of the three disks are lost, the data cannot be recovered, so if one fails, quickly find a replacement for it.

P

Puma Thailand, 2011-01-11
@opium

I recommend you refrain from raids.