Date: Sun, 13 Mar 2011 18:26:19 +0000 From: Tim Bishop <tim@bishnet.net> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS system unresponsive Message-ID: <20110313182619.GC977@carrick-users.bishnet.net> In-Reply-To: <20110313180759.GA3266@icarus.home.lan> References: <AANLkTinmbYRWz8kG=e1AECpj51cNRvjt2MjjCXixYxjU@mail.gmail.com> <20110313164430.GA977@carrick-users.bishnet.net> <20110313180759.GA3266@icarus.home.lan>
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Hi Jeremy, On Sun, Mar 13, 2011 at 11:07:59AM -0700, Jeremy Chadwick wrote: > I'm snipping the statistics that instead people can read via the mailing > list archive URL: > > http://lists.freebsd.org/pipermail/freebsd-fs/2011-February/010796.html > > On Sun, Mar 13, 2011 at 04:44:30PM +0000, Tim Bishop wrote: > > I did the upgrade to 8-STABLE and it didn't help. I'm still seeing the > > same issue. > > > > Someone else in another thread mentioned about graphing the zfs-stats > > output with munin, so I thought I'd give that a whirl. Here are the > > results: > > > > (static snapshot of data so it doesn't change between when I write this > > and when somebody reads it) > > > > http://www.bishnet.net/tim/tmp/munin/carrick/carrick/index.html > > > > This slow down is triggered by the tarsnap backups I run each day. They > > start about 01:15 (in the same timezone as the graphs) and finished at > > around 11:15 after I poked it. It slows down when processing my Maildir > > folders, but doesn't actually stop - it's processing a single file every > > couple of seconds. > > The below may be informational to you, or at least give you something to > ponder. It may not be the problem you're experiencing, so I don't want > to divert you from your efforts. Please keep that in mind when reading > the below. [snip ZFS and Maildir notes] Thanks for your reply. I'll check those details over to see if there's anything of relevance. But I just wanted to point out that this doesn't happen all the time. It happens maybe 1 night in 5 when backing up. So it doesn't seem like it's an inherent issue with Maildir on ZFS. But yes, I do agree Maildir on ZFS is poor. I also have a Maildir+Solaris+NFS setup at work :-) Tim. -- Tim Bishop http://www.bishnet.net/tim/ PGP Key: 0x5AE7D984
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