Date: Tue, 23 Jun 2009 14:24:02 +0200 From: Gary Jennejohn <gary.jennejohn@freenet.de> To: Simun Mikecin <numisemis@yahoo.com> Cc: freebsd-fs@freebsd.org Subject: Re: 7.2-STABLE: swap on ZFS v13 Message-ID: <20090623142402.2c8d4b65@ernst.jennejohn.org> In-Reply-To: <288239.1376.qm@web37303.mail.mud.yahoo.com> References: <288239.1376.qm@web37303.mail.mud.yahoo.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, 23 Jun 2009 03:01:53 -0700 (PDT) Simun Mikecin <numisemis@yahoo.com> wrote: > Before ZFS v13 import to the 7-STABLE branch, it was a well known fact that swap on ZFS volume (zvol) will not work. > Recently, I tried to use swap on ZFS v13 (7-STABLE/amd64). It seems that it works. > > I used 4k for the volblocksize as that is equivalent to hardware page size. > I tried with compression enabled and disabled. Enabling compression reduces number of bytes that need to be swapped in and out to the zvol. > > zfs create -o volblocksize=4k -o compression=on -o org.freebsd:swap=on -V 4g tank/swap > swapon /dev/zvol/tank/swap > > Is there anybody else who tried 7-STABLE/amd64 with swap on ZFS v13? Does it work or not? > I doubt that you can generate a crash dump using ZFS as swap, especially if you have compression enabled. But I might be wrong. Does anyone know? --- Gary Jennejohn
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20090623142402.2c8d4b65>