Date: Wed, 17 Oct 2007 17:44:33 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: Eric Anderson <anderson@freebsd.org> Cc: Pawel Jakub Dawidek <pjd@freebsd.org>, freebsd-geom@freebsd.org Subject: Re: gjournal: FLUSHCACHE timed out Message-ID: <47161FD1.5010501@icyb.net.ua> In-Reply-To: <4715F4EE.9020104@freebsd.org> References: <4715C3D1.3070308@icyb.net.ua> <4715F4EE.9020104@freebsd.org>
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on 17/10/2007 14:41 Eric Anderson said the following: > Andriy Gapon wrote: >> ad4s1ge (please don't pay attention to its slightly unusual name, this >> is for historic reasons) is a journal partition/consumer for my /var >> filesystem/partition/provider. >> Size of /var is 16G, size of the journal is slightly less than 1G (1G - >> 32 sectors actually). /var is UFS2 with softupdates enabled. > > > Pawel, correct me if I'm wrong here - but I think you really need to > turn *off* softupdates on gjournaled file systems. I was under a big mis-impression that I have to have softupdates enabled for snapshots to work. Now that I know that I was wrong I will turn off the softupdates. But it seems that there is nothing that would preclude _in principle_ combination of softupdates/gjournal. Anyway, I care only out of curiosity. >> I noticed that I get these messages only when I run 'dump' on any of my >> filesystems. I think that dump is using /tmp or /var/tmp for some >> temporary data and in my setup both of those are in /var filesystem. >> >> So my I guess is that /var is being written "too" actively and I have to >> tune some parameters to make things smooth. > > A few things to note: > > - you can turn on 'async' option for your gjournaled file system, and > get better performance will do > - you might be able to at the 'noatime' option to your file system mount > also probably will do as well > - You might try turning your journal switch time from 10 down to 5, and > see if it alleviates some pressure on your disk. I already did this and it helped! I don't see the messages anymore. Thank you! I will try to set this back to 10 after I do away with softupdates and see what happens. Thank you very much again. -- Andriy Gapon
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