Date: Fri, 01 May 2009 17:27:49 -0400 From: Mike Tancsa <mike@sentex.net> To: Pete French <petefrench@ticketswitch.com>, freebsd-stable@freebsd.org Subject: Re: current zfs tuning in RELENG_7 (AMD64) suggestions ? Message-ID: <200905012126.n41LQiIk045684@lava.sentex.ca> In-Reply-To: <E1LzzjJ-0002eV-5A@dilbert.ticketswitch.com> References: <200905012041.n41Kf47B045440@lava.sentex.ca> <E1LzzjJ-0002eV-5A@dilbert.ticketswitch.com>
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At 04:53 PM 5/1/2009, Pete French wrote:
>The tuning isn't there to improve performance, it's there to prevent
>the box going titus due to a panic when the ARC gets too big, and
>you are missing the mian one, which is to limit the size of the ARC.
>On recent versions of BSD (and you are running 7.2, so thats fine) then
>the defaults for kmem size are fine, but you still need something like this:
>
>vfs.zfs.arc_max="256M"
>
>In there to stop the ARC growing. thats the only tuning I have on
>my 4 gig machine, which takes a steady stream of data and is used
>for taking backup snapshots. ZFS is excellent, and for me is perfectly
>stable, to the point where I am starting to roll it out to production
>machines, with the above tuning.
Thanks for the feedback. We too have had good results with zfs for
what we have used it for. Our primary backup server has a
traditional raid5 spool as well as a zfs spool and it has been
working quite well in the last 6months. In that period we did swap
out a dead drive, a dying drive and added a new drive to expand the
pool. We are just expanding our DR site's backup server and will
make use of ZFS there. Stability / reliability is our main goal for
this app so I will take a look at the arc_max setting
---Mike
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