Date: Wed, 25 Apr 2007 09:29:47 -0500 From: Barry Pederson <bp@barryp.org> To: freebsd-fs@FreeBSD.org Subject: ZFS: inherited mountpoints with root filesystem Message-ID: <462F65DB.5010305@barryp.org>
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I've been fooling with using ZFS for the root filesystem, and a CompactFlash device to hold a UFS /boot - It seems to work very well, CF devices are big enough that you can put a pretty full install of FreeBSD on it which is nice for recovery/maintenance work on the real disk. One problem I've noticed though is that there's a difference between the mountpoint of a pool's root filesystem that FreeBSD sees and what ZFS sees. For example, the "mount" command shows" tank on / (zfs, local) but "zfs list" shows: NAME USED AVAIL REFER MOUNTPOINT tank 1.98G 16.4G 16.7M /tank I'm finding that having the "tank" filesystem be "/" and "/tank" simultaneously makes it awkward when creating sub-filesystems, say for example "tank/usr" and "tank/var". Currently, they inherit the "/tank" mountpoint, and show up as "/tank/usr" and "/tank/var" - where I'd like them to inherit "/" and end up as "/usr" and "/var". For now, I've worked around this with symlinks in the "tank" filesystem like: usr -> tank/usr , but the problem is that when mounting the CompactFlash as root and importing "tank", it complains that it can't mount "tank/usr" (because the symlink is in the way). I've also tried explicity setting the mountpoint for "tank/usr" to "/usr", which is fine except again for when the CF is used as root, which would then conflict with the CF filesystem's "/usr" Is this double-mountpoint setup the way things should be? If so, is/can there be an option to have the ZFS-mountpoint for a root-mounted filesystem also be "/", so that inherited mountpoints for sub-filesystems are under "/" instead of "/<pool-name>"? Barry
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