Date: Tue, 19 Feb 2013 04:22:27 +0100 From: Polytropon <freebsd@edvax.de> To: Fbsd8 <fbsd8@a1poweruser.com> Cc: FreeBSD questions <questions@freebsd.org> Subject: Re: How to add zfs support to FreeBSD? Message-ID: <20130219042227.7bcc3477.freebsd@edvax.de> In-Reply-To: <5122D83F.6090107@a1poweruser.com> References: <51229B47.4070605@a1poweruser.com> <5122A3BA.2000907@a1poweruser.com> <20130219015600.68050fb2.freebsd@edvax.de> <5122D83F.6090107@a1poweruser.com>
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On Mon, 18 Feb 2013 20:41:19 -0500, Fbsd8 wrote: > So the next question is there any sh script code I can use to > check if zfs has been enabled by the rc.conf zfs_enable statement. > > I need to determine if zfs is enabled on the host. Even though the statement zfs_enable="YES" may be part of /etc/rc.conf, it's still possible that the ZFS subsystem is _currently_ not running. So in my opinion you should check with something that relies on ZFS actually running. So there could be a difference between "is enabled" and "is running". Regarding "is enabled", you can easily check if the corresponding line in /etc/rc.conf is present. This could result in a false-positive answer regarding "is running". For example, if I add zfs_enable="YES" to /etc/rc.conf and check its presence (e. g. using grep), but I don't do anything else; I'll get this: % zfs internal error: failed to initialize ZFS library Here's an example from a system not running ZFS: /sbin/zfs > /dev/null 2>&1 if [ $? -eq 0 ]; then echo "ZFS is currently running." else echo "ZFS is currently _not_ running." fi Check on a system running ZFS. :-) -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...
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