Date: Sun, 26 Jun 2011 00:07:14 +1200 From: Peter Toth <freebsd@snap.net.nz> To: freebsd-questions@freebsd.org Subject: Re: NFS zfs serveur (hardware question) Message-ID: <4E05CF72.2040800@snap.net.nz> In-Reply-To: <BANLkTimU3CbydO=rD0g=jMo=tf31pM9UMw@mail.gmail.com> References: <20110622134158.GA2679@e4310> <808833D7-FAD4-46E2-ACB6-71993AD048FB@my.gd> <BANLkTimU3CbydO=rD0g=jMo=tf31pM9UMw@mail.gmail.com>
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On 06/24/11 10:17, David Brodbeck wrote: > On Wed, Jun 22, 2011 at 6:26 PM, Damien Fleuriot <ml@my.gd> wrote: >> As a rule of thumb and for a serious server, I would recommend 1 SSD as dedicated cache and 2 SSD for a mirrored ZIL (you don't want to lose this data). >> However I think ppl posted about running intro trouble when using both ZIL and cache disks, so I suggest you only get the ZIL. > Definitely get the ZIL device. NFS performance will be almost > intolerable without it. It used to be you could work around this, at > cost of an increased risk of data loss if the server crashed, by > turning off the ZIL; but as of 9.0 this is no longer allowed, so a ZIL > device is pretty much mandatory. I'm looking at ways to add one to > one of my machines for this reason. > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > There is still a way to increase NFS performance in 9.0 (without a ZIL SSD) by setting zfs property "sync=disabled", which will disable synchronous writes - comes with some risks, research it before switching it off. Also, this will only disable sync for the ZFS filesystem not for the whole pool.
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