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Date:      Sat, 25 Jun 2011 23:43:28 -0700
From:      David Brodbeck <gull@gull.us>
To:        freebsd-questions@freebsd.org
Subject:   Re: NFS zfs serveur (hardware question)
Message-ID:  <BANLkTin5EaHGa--JDhhAQwxPrtLH7OnqjA@mail.gmail.com>
In-Reply-To: <4E05CF72.2040800@snap.net.nz>
References:  <20110622134158.GA2679@e4310> <808833D7-FAD4-46E2-ACB6-71993AD048FB@my.gd> <BANLkTimU3CbydO=rD0g=jMo=tf31pM9UMw@mail.gmail.com> <4E05CF72.2040800@snap.net.nz>

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On Sat, Jun 25, 2011 at 5:07 AM, Peter Toth <freebsd@snap.net.nz> wrote:
> 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.

Thanks, I'll look into that.

I do appreciate that ZFS tries to be more careful about sync writes
than most filesystems.  But I also have users who expect "tar xvf" to
complete in a reasonable amount of time, and having the ZIL enabled
reduces file creation performance by a factor of ten. ;)



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