[CentOS] Question about a hard drive error

Benjamin Franz jfranz at freerun.com
Tue Nov 16 14:07:48 EST 2010


On 11/16/2010 10:47 AM, John R Pierce wrote:
>
> raid sets really shouldn't be much bigger than about 8 drives,
> anyways.   rebuild times for a 12 drive raid6 would be astronomical.
>

You are ok up to here. Rebuild time for replacement of a failed drive 
scales by drive size, not raid set size, regardless of whether it is 
RAID1, 5, 6 or 10. It remains roughly the amount of time it takes to 
completely write one drive at full speed (at least unless you run out of 
bus bandwidth - but that takes a lot of drives).

However, system availability/performance is much better for RAID10 than 
for the others during a rebuild because of the isolation of the rebuild 
work to only the involved spindles.

-- 
Benjamin Franz



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