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

[Emmanuel Florac]

Le Mon, 9 Apr 2012 10:19:43 +1000 vous écriviez:

> A decent RAID controller with a BBWC and a single LUN benefits from
> parallelism just as much as a large disk arrays do because the BBWC
> minimises the write IO latency and the controller to do a better job
> of scheduling its IO.

BTW recently I've found that for storage servers, noop io scheduler
often is the best choice, I suppose precisely because it doesn't try to
outsmart the RAID controller logic...

-- 
------------------------------------------------------------------------
Emmanuel Florac     |   Direction technique
                    |   Intellique
                    |	<eflorac at intellique.com>
                    |   +33 1 78 94 84 02
------------------------------------------------------------------------