On Apr 12, 2011, at 12:31 AM, John R Pierce wrote:
> On 04/12/11 12:23 AM, Matthew Feinberg wrote:
>> Hello All
>>
>> I have a brand spanking new 40TB Hardware Raid6 array
>
> never mind file systems... is that one raid set? do you have any
> idea
> how LONG rebuilding that is going to take when there are any drive
> hiccups? or how painfully slow writes will be until its rebuilt? is
> that something like 22 x 2TB or 16 x 3TB? I'll bet a raid rebuild
> takes nearly a WEEK, maybe even longer..
>
> I am very strongly NOT in favor of raid6, even for nearline bulk
> backup
> storage. I would sacrifice the space and format that as raid10, and
> have at LEAST a couple hot spares too.
+1 for the 1+0 and a few hot spares.
Raid 6 + spare ran great but rebuilds took 2 days. The likely hood of
2+ failed drives is less then 1 failed drive but I actually had 2
failed drives so RAID6 + spare saved me.
Hence why I switched to RAID 1+0 + spares.
A tuned XFS fs will work great.
I run my large RAID XFS fs with logbufs=8, and no(atime.dirtime).
I also run iozone for testing my tuned options for optimum performance
in my env.
- aurf
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