Date: Mon, 19 Sep 2011 11:12:42 -0400 From: Rotate 13 <rabgvzr@gmail.com> To: freebsd-fs@freebsd.org Subject: ZFS: deferring automounts/mounting root without bootfs [9.0-BETA2] Message-ID: <CADBSp1fW2M0Y4ccvW9tBMFHzeJApB4p8O38xKH6No%2BN5DQxKqw@mail.gmail.com>
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9.0-BETA2 system is booted off removable UFS volume, but root is mounted from ZFS. I try to meet the following two goals: 1. Not use bootfs property (too many limitations mentioned in docs) 2. Use ZFS inheritable mountpoints and management (not clutter up /etc/fstab... and not set mountpoint= on each child dataset!) Config info is below. Result: System boots, but hangs with init: can't exec getty '/usr/libexec/getty' for port /dev/ttyv0: No such file or directory (and many similar messages) I think I need some way other than bootfs to defer ZFS automatic mounting until after / is mounted. Apparently mount is not functioning right. I am guessing that ZFS tries to mount tank/usr, tank/var and so forth before root is mounted (thus mounts fail). However this is just a guess - based on what happens when I zpool import -f -o altroot. For obvious reason, I don't have logs of above problem; and I cannot review the messages that scrolled by, as this keyboard completely lacks a scroll lock key (guilty: Dell). Simplified config (have tried number of subtle variations): zpool create -O canmount=off -O mountpoint=/ setuid=off tank /path/to/disk zfs create -o mountpoint=legacy -o setuid=on tank/root [...create datasets for /usr, /var, and so forth, inheriting root mountpoint...] = On UFS volume: = /boot/etc/fstab: tank/root / zfs rw,noatime 0 0 /path/to/ufsboot /boot rw,noatime 0 0 /boot/loader.conf zfs_load="YES" vfs.root.mountfrom="zfs:tank/root" = On ZFS volume: = /etc/fstab: tank/root / zfs rw,noatime 0 0 /etc/rc.conf: zfs_enable="YES" (also tried placing this on UFS volume in /boot/etc/rc.conf) /boot on ZFS is kept in sync with /boot on UFS volume. Note, zpool is exported/imported and zpool.cache properly placed in /boot/zfs; before I did that, I got mountroot followed by panic. Off hand note: I get lots of lock order reversals mounting filesystems on 9.0-BETA2. But not specific only to ZFS. Thanks for any advices in making work an unusual, but very useful configuration.
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