[CentOS] RAID 5 setup?

Christopher Chan christopher.chan at bradbury.edu.hk
Fri Mar 26 02:36:41 UTC 2010


On Friday, March 26, 2010 09:12 AM, John R Pierce wrote:
> 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

That's what I said right? I did not say when a mirror is broken...


> 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.

yeah, I thought the raid10 module would be able to rebuild automatically 
from a hotspare and would therefore be better than using nested raid1+0. 
I better stop the nested raid1+0 thing...does ananconda support the 
raid10 module during install yet? I mean rather, is the raid10 module 
included in the installation initrd yet?


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