[CentOS] 40TB File System Recommendations

Tue Apr 12 17:50:37 UTC 2011
aurfalien at gmail.com <aurfalien at gmail.com>

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