Date: Mon, 09 Apr 2007 10:51:34 +0200 From: Alex Dupre <ale@FreeBSD.org> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: freebsd-fs@FreeBSD.org, freebsd-current@FreeBSD.org Subject: Re: ZFS: amd64, devd, root file system. Message-ID: <4619FE96.2010508@FreeBSD.org> In-Reply-To: <20070409102240.u6yxvjr72888cc04@webmail.leidinger.net> References: <20070409011723.GB74547@garage.freebsd.pl> <20070409102240.u6yxvjr72888cc04@webmail.leidinger.net>
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Alexander Leidinger wrote: > Do you have a quick guide how to do this? It's the same as having a graid3 or geli root fs: you need a simple ufs partition with /boot and then everything else on zfs. > I'm a little bit puzzled how the FS layout would look like. Just from > thinking about it I would do the following, but I like to know if this > is the right way: > - ad0s1a -> contains a / with contains only the boot directory > - some zpool which contains / with everything except the boot > directory It's not mandatory to remove the boot directory from zfs, but yes, that's the idea. Usually you have ad0s1a on a removable media, or (g)mirror all the adXs1a partitions so that a disk failure doesn't prevent booting into a usable system. > In one scenario I would just hope that ZFS DTRT magically, but this > would imply that ZFS does some kind of union/overlay/underlay mount. > > So I lean more towards a ad0s1a mounted by hand to somewhere else in the > ZFS namespace and a symlink from the zfs /boot directory to the real > location where the UFS is mounted. Why a symlink? You can mount it exactly there. > In both scenarios I'm not sure how the fstab would look like. Currently I'm using a removable media, so I don't automatically mount /boot from it, but I have a copy. If you use the gmirrored disk slices, you can design your /etc/fstab like: /dev/zfs/tank/root / /dev/gmirror/boot /boot /dev/zvol/tank/swap <swap> /dev/zfs/tank/usr /usr ... (This is the general idea, I haven't looked how zfs fs entries should appear in fstab, yet, so I cannot give you the exact fstab dump). -- Alex Dupre
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