On Mon, Apr 09, 2012 at 01:39:13PM +0200, Emmanuel Florac wrote: > 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... We've been recommending the use of the no-op (or worst case, deadline) scheduler for XFS on hardware RAID for quite a few years. I only test against the no-op scheduler, because I got sick of having to track down regressions caused by "smart" CFQ heuristics.... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
