Date: Wed, 05 Oct 2011 21:51:42 -0400 From: Daniel Staal <DStaal@usa.net> To: Dave Cundiff <syshackmin@gmail.com> Cc: freebsd-fs@freebsd.org, questions@freebsd.org Subject: Re: ZFS Write Lockup Message-ID: <15370081D51E465D77FAAA41@mac-pro.magehandbook.com> In-Reply-To: <CAKHEz2ZyZm5QHBZ4RS7jUZX64WfZTYs8Wy9F6h7h2pkQza-KNw@mail.gmail.com> References: <CAKHEz2a%2BRFmcCyEMnooDmb8vERA-qg0A474LZ9mLtPvoij8Xmw@mail.gmail.com> <EB6EF2AF144081215CE275CC@mac-pro.magehandbook.com> <CAKHEz2ZyZm5QHBZ4RS7jUZX64WfZTYs8Wy9F6h7h2pkQza-KNw@mail.gmail.com>
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--As of October 5, 2011 6:37:17 PM -0400, Dave Cundiff is alleged to have said: > Its for a backup service I've been working on. It takes a snapshot > hourly of all 17 zvols. I was planning on keeping them for a month. > > I had the same thought about the snapshots and deleted them all > yesterday. It appears there is some issue with keeping that many. I > removed them all and the zvols are now functioning correctly. Its > strange that the large number didn't cause incremental slowdown. While > the snapshots were still there the IO was normal when it wasn't acting > up. Just it would have spurts of almost total lockup until I performed > a snapshot removal operation or 2. --As for the rest, it is mine. Look at sysutils/zfs-periodic. It does that type of backup, although it doesn't keep quite as many. (Several hourly, daily, weekly, and monthly. Configurable. I have 38 filesystems, and 780 snapshots. (Only one volume, though.)) And that definitely sounds like a bug. Gradual slowdowns would be expected if you were just reaching performance limits, but sudden stops sound like there's a condition that doesn't work someplace, or some loop the system can get into. Daniel T. Staal --------------------------------------------------------------- This email copyright the author. Unless otherwise noted, you are expressly allowed to retransmit, quote, or otherwise use the contents for non-commercial purposes. This copyright will expire 5 years after the author's death, or in 30 years, whichever is longer, unless such a period is in excess of local copyright law. ---------------------------------------------------------------
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