Am 29.07.2013 12:01, schrieb Dave Chinner: > On Mon, Jul 29, 2013 at 10:31:52AM +0200, Stefan Priebe - Profihost AG wrote: >> Am 29.07.2013 10:22, schrieb Dave Chinner: >>> On Mon, Jul 29, 2013 at 09:39:37AM +0200, Stefan Priebe - Profihost AG wrote: >>>> Hi, >>>> >>>> while running 3.0.78 and doing heavy rsync tasks on a raid 50 i'm gettig >>>> these call traces: >>> >>> Judging by the timestamps the problem clears and the system keeps >>> running? >> >> Yes. >> >>> If so, the problem is likely to be a combination of contention on a >>> specific AG for allocation and slow IO. Given it is RAID 50, it's >>> probably really slow IO, and probably lots of threads wanting the >>> lock and queuing up on it. >>> >>> What's 'iostat -m -x -d 5' look like when these messages are dumped >>> out? >> >> Don't have that but some nagios stats. There were 1000 iop/s and 8MB/s. > > Yup, that sounds like it was doing lots of small random IOs and > hence was IO bound... > >> But i can reduce the tasks done in parallel if this is the problem. > > Try and find out what the average IO times were when the messages > are being emitted. If that's up in the seconds, then it's a good > chance you are simply throwing too many small IOs at your storage. Thanks! Stefan _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
