[CentOS] RAID 5 setup?
John R Pierce
pierce at hogranch.com
Fri Mar 26 02:12:00 UTC 2010
Christopher Chan wrote:
>> but with RAID 10, data is safe after many types of failures.
> Except for the case when a mirror dies after which the whole thing is
> toast but in theory you can survive up to four disks going down.
if you have a 8 drive raid1+0, and a random drive fails, you can survive
any other drive failing *except* the mirror of the failed one. so if a
second drive fails, there's only a 1 in 7 chance that its the 'fatal'
one. on a 4 drive raid10, its a 1 in 3 chance. meanwhile, a raid10
can rebuild from a hotspare in like an hour, if the system isn't busy,
and a few hours in the background if its busy and active.
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