On Jun 26, 2013, at 6:48 PM, Dave Chinner wrote: > On Wed, Jun 26, 2013 at 04:56:31PM -0700, aurfalien wrote: >> Hi all, >> >> Wondering if my log being just under 2GB is a bad idea. >> >> Noticing flush-253:2/kcopyd which is my XFS file system getting >> really high load avg and wait times via top). > > What has the log size got to do with something that is happening at > the block layer? What's your storage config? > >> Doing a simple rsync over NFS and after a bit, the system gets to a load of 24.... yikes... > > Let me guess - 24 nfsds blocked waiting for kcopyd to do it's stuff? > > Load average going up when the NFS server is busy generally means > your IO subsystem is heavily loaded - it's not uncommon to see large > NFS servers that are extremely busy sustain load averages over a > 100 (or even 1000) for hours/days on end.... > >> Upon killing the rsync, I am seeing loads going down to sub 1 >> after about 10 min. I have repeated this to verify 10 min. > > Sure. Processes blocked on IO contribute to the load average. Kill > the IO load, and the load average will return to nothing in 10-15 > minutes. Not so fast my fine feathered friend. Same work load, same hardware. Only diff is; External log, its 2GB And its Centos 6.4 which was previously 5.9. Its 16 drives in a hw raid 6, but 2 are for the mirrored journal and 1 for hot spare so 13 spindles. Before it was 14 spindles in raid 6 and 2 hot spare. I did power cycle it late last night and will more closely observe today. Very odd. - aurf _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
