From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id BCB9A7F66 for ; Wed, 26 Jun 2013 20:48:19 -0500 (CDT) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay3.corp.sgi.com (Postfix) with ESMTP id 5529EAC001 for ; Wed, 26 Jun 2013 18:48:15 -0700 (PDT) Received: from ipmail06.adl2.internode.on.net (ipmail06.adl2.internode.on.net [150.101.137.129]) by cuda.sgi.com with ESMTP id IAF7IvZW25GeaPGK for ; Wed, 26 Jun 2013 18:48:14 -0700 (PDT) Date: Thu, 27 Jun 2013 11:48:10 +1000 From: Dave Chinner Subject: Re: sizing log - is there a too big? Message-ID: <20130627014810.GA29790@dastard> References: <55C24454-59E9-4285-9A4C-C4BD24EDBEEC@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <55C24454-59E9-4285-9A4C-C4BD24EDBEEC@gmail.com> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: aurfalien Cc: xfs@oss.sgi.com 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. Cheers, Dave. -- Dave Chinner david@fromorbit.com _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs