26 Mar
2010
26 Mar
'10
2:12 a.m.
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.