Date: Tue, 8 Feb 2011 15:00:58 +0000 From: Tom Evans <tevans.uk@googlemail.com> To: "Patrick M. Hausen" <hausen@punkt.de> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: 8.1 amd64 lockup (maybe zfs or disk related) Message-ID: <AANLkTinqVpusdH8gQhvxC8raZUFD08GXgTKiLnAhCtjW@mail.gmail.com> In-Reply-To: <6E948342-DEFF-4DEB-B0DC-990B647549EB@punkt.de> References: <1297026074.23922.8.camel@ubuntu> <20110207045501.GA15568@icarus.home.lan> <1297065041.754.12.camel@ubuntu> <20110207085537.GA20545@icarus.home.lan> <6E948342-DEFF-4DEB-B0DC-990B647549EB@punkt.de>
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On Tue, Feb 8, 2011 at 2:52 PM, Patrick M. Hausen <hausen@punkt.de> wrote: > Hello, Jeremy, > > Am 07.02.2011 um 09:55 schrieb Jeremy Chadwick: >> The Wiki is outdated, I'm sorry to say. =C2=A0Given that you have 8GB RA= M, I >> would recommend these settings. >> ... > > Thank you very much for the insight. A current summary of recommended > settings is very much appreciated. > > Could you add values for amd64 machines with 4 and 16 GB of memory? > That would help me a lot. Storage around 4 and 11 TB, respectively. > Access pattern: backup storage. > > Kind regards, > Patrick My home file server is similar in spec to that - Core 2 Duo, 4 GB RAM and running 8.2-RC3/amd64, with a pool with two 6 x 1.5 TB raidz arrays, for a total capacity of ~16 TB. The only ZFS settings I have changed from default are: # Allow prefetch (normally disabled for 4GB or less RAM) vfs.zfs.prefetch_disable=3D0 # Don't let ZFS use UMA, restricts available memory vfs.zfs.zio.use_uma=3D0 I think vfs.zfs.zio.use_uma defaults to 0 now anyway. I've never had a crash related to memory pressure or any other ZFS issue - it doesn't get that stressed. YMMV! Cheers Tom
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