XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?)

[Stan Hoeppner]

On 4/7/2012 3:49 AM, Emmanuel Florac wrote:
> Le Fri, 06 Apr 2012 18:28:37 -0500 vous écriviez:
> 
>> Creating four 60 drive RAID10 arrays, let alone 60 drive RAID6
>> arrays, would be silly.
> 
> From my experience, with modern arrays don't make much of a difference.
> I've reached decent IOPS (i. e. about 4000 IOPS) on large arrays of up
> to 46 drives provided there are enough threads -- more threads than
> spindles, preferably.

Are you speaking of a mixed metadata/data heavy IOPS workload similar to
that which is the focus of this thread, or another type of workload?  Is
this 46 drive array RAID10 or RAID6?

-- 
Stan