[CentOS] RAID 5 setup?

Rainer Duffner rainer at ultra-secure.de
Thu Mar 25 21:27:56 UTC 2010

Am 25.03.2010 um 22:07 schrieb Boris Epstein:
> Robert,
> Why is the size a factor here? Why would this be OK with smaller
> disks? How would you partition this instead?
> Thanks.
> Boris.

This has been discussed before.

The root of the problem lies in the fact that when a disk fails, you  
have to read-out the data from the other disks to re-build the RAID.
Reads from disks have a certain probability to contain an error.
The larger the disk and the larger the array, the more probable it is  
to encounter such an error while rebuilding the RAID (and if that  
happens, you're RAID is just a piece of scrap-metal)


RAID5 works OK-ish for a couple of 146GB SAS-disks.

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