Date: Wed, 02 Mar 2011 09:57:12 +0100 From: Alexander Leidinger <Alexander@Leidinger.net> To: Dr Josef Karthauser <joe@tao.org.uk> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS on a single disk? Message-ID: <20110302095712.129650oisvocoq4o@webmail.leidinger.net> In-Reply-To: <20110302001650.GB49147@icarus.home.lan> References: <0E00DAFC-C39F-47DC-B9AF-16419C20997F@tao.org.uk> <615F1346-E830-42E2-B229-4181B8BC56BD@exonetric.com> <53FA69D2-2EF0-4CBF-985B-6E710F15FE02@tao.org.uk> <20110302001650.GB49147@icarus.home.lan>
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Quoting Jeremy Chadwick <freebsd@jdc.parodius.com> (from Tue, 1 Mar 2011 16:16:50 -0800): > On Wed, Mar 02, 2011 at 12:00:24AM +0000, Dr Josef Karthauser wrote: >> On 1 Mar 2011, at 23:49, Mark Blackman wrote: >> > >> > On 1 Mar 2011, at 23:27, Dr Josef Karthauser wrote: >> > >> >> Does it make sense to run zfs on a single disk? >> >> >> >> I'm setting up a FreeBSD host over at a Xen provider, with a >> single 80GB disk image. Ideally I'd like to run ZFS on this system, >> for snapshot and flexible creation of filesystems and quotas. Has >> anyone got any recommendations for me in this regard? Am I crazy? >> > >> > Not crazy, I do this as well, all the time just to get the >> management capabilities and >> > leave hardware RAID to manage the availability. >> > >> > - Mark >> >> Any idea what the performance implications are? Can I get away >> without a ZIL or ARC and still get a decent performance? > > Do not disable the ZIL. I hate referring to the Solaris documentation > for FreeBSD, but it applies: > > http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Disabling_the_ZIL_.28Don.27t.29 > > And you cannot disable the ARC, so just tune it appropriately (which > you'll need to do on FreeBSD anyway). In fact, by getting rid of the > ARC (as you proposed), you would suffer worse performance than if you > had it in use. If you are not satisfied with the performance, you can add a USB memory stick as a cache device to the pool. See the following link to get a glue about what to expect and when it makes sense and when not: http://www.leidinger.net/blog/2010/02/10/making-zfs-faster/ Bye, Alexander. -- To add insult to injury. -- Phaedrus http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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