Date: Tue, 19 Jan 2010 09:45:58 -0500 From: jhell <jhell@DataIX.net> To: freebsd-hackers@freebsd.org Subject: Re: Setting "zfs_arc_max" value in FreeBSD 8. Message-ID: <4B55C5A6.2020109@DataIX.net> In-Reply-To: <7f14551c1001190216w49814186n1ada2b721380502b@mail.gmail.com> References: <7f14551c1001190119x46c6b04dx2362cd1252f0d81@mail.gmail.com> <hj3v0i$i2p$1@ger.gmane.org> <7f14551c1001190216w49814186n1ada2b721380502b@mail.gmail.com>
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On 1/19/2010 5:16 AM, Sherin George wrote: > Thanks Ivan :) > > I found It. add following in /boot/loader.conf > > =================== > vfs.zfs.arc_max="10244M" > =================== > > -- > Best Regards, > Sherin > > On Tue, Jan 19, 2010 at 3:15 PM, Ivan Voras <ivoras@freebsd.org> wrote: > >> On 01/19/10 10:19, Sherin George wrote: >> >>> Hello, >>> >>> I am trying to tune ZFS file system by setting "zfs_arc_max" value in >>> FreeBSD 8. >>> >>> In solaris, it is achieved like this >>> >>> ================================================= >>> For example, if an application needs 5 GBytes of memory on a system with >>> 36-GBytes of memory, you could set the arc maximum to 30 GBytes, >>> (0x780000000 or 32212254720 bytes). Set the zfs:zfs_arc_max parameter in >>> the >>> /etc/system file: >>> >>> set zfs:zfs_arc_max = 0x780000000 >>> >>> or >>> >>> set zfs:zfs_arc_max = 32212254720 >>> ================================================= >>> >>> But, I couldn't find /etc/system file in FreeBSD. >>> >>> Could some one please guide me to correctly configure "zfs_arc_max" in >>> FreeBSD 8. >>> >> >> You should probably start here: >> >> http://wiki.freebsd.org/ZFSTuningGuide >> >> and more generally, here: >> >> http://wiki.freebsd.org/ZFS >> I just thought I would give a shout at this for stable/7 as of last week. I am not sure if this is just me but I had tried to adjust zfs_arc_max and found out that it was unadjusted to my value after the system came back up. Anyone know if it is adjustable on a system with 1024MB of ram ? Is this just being auto calculated by some other value ? -- jhell
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