Date: Mon, 28 Mar 2011 16:41:13 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Claus Guttesen <kometen@gmail.com> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: zfs, nfs and zil Message-ID: <20110328164113.70512us1tv7w5gcg@webmail.leidinger.net> In-Reply-To: <BANLkTinZvLDkmUNHmDGQpQFRr31s=hyHuQ@mail.gmail.com> References: <BANLkTinZvLDkmUNHmDGQpQFRr31s=hyHuQ@mail.gmail.com>
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Quoting Claus Guttesen <kometen@gmail.com> (from Mon, 28 Mar 2011 13:22:00 +0200): > I've setup a server with FreeBSD 8.2 (prerelase) and patched zfs to > ver. 28. The server has 11 disks each 2 TB in raidz2. The performance > is very good and I've got approx. 117 MB/s on plain GB nics using > iscsi. > > I'm mounting the FreeBSD-server from a couple of vmware esxi 4.1 > servers using nfs, but when there is alot of i/o the server becomes > unresponsive, easily triggered by installing ie. ms-sql. The server > itself is up but is not reachable from the network. When I take the > nic down and up again connection to the network is reestablished > (ip-wise). > > A friend of mine has suggested that I disable the zil. The page > http://wiki.freebsd.org/ZFSTuningGuide says 'Disabling ZIL is not > recommended where data consistency is required (such as database > servers) but will not result in file system corruption.' > > Has anyone tried to disable zil and achieved better performance and > still maintain a consistent filesystem? The ZIL is not linked to NIC down/up events. It is a completely different topic. I suggest to find the real problem instead of doing some random tuning (which is not tuning in this case but foot-shooting). FYI: disabling the ZIL is someting to do if you are desperate, do not care about production incidents, and everything else (if the ZIL is the problem -- which most probably it isn't by reading your message -- a (maybe write optimized) SSD as a log device could be a solution) does not solve the issue. Bye, Alexander. -- I'll eat ANYTHING that's BRIGHT BLUE!! http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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