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BBK
Asked: 2012-02-12 09:55:49 +0800 CST

Ubuntu: How to mount zfs snapshot?

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I'm trying to mount zfs snapshot. It should to be so easy...but I can't do that. I'm using Ubuntu Server 11.10 Oneric, kernel 3.0.0-15-server.

Installed ZFS from ppa also I'm using zfs-auto-snapshot. With manually created snapshots the same situations.

How to mount zfs snapshot?

root@us1:/# zfs list -t snapshot
NAME                                                            USED  AVAIL  REFER  MOUNTPOINT
tank/www@zfs-auto-snap_hourly-2012-02-11-1917                   0      -   268K  -

root@us1:/# zfs mount tank/www@zfs-auto-snap_hourly-2012-02-11-1917 /mnt/snapshot/tank/www
too many arguments
usage:
        mount
        mount [-vO] [-o opts] <-a | filesystem>

For the property list, run: zfs set|get

For the delegated permission list, run: zfs allow|unallow

root@us1:/# zfs mount tank/www@zfs-auto-snap_hourly-2012-02-11-1917
cannot open 'tank/www@zfs-auto-snap_hourly-2012-02-11-1917': operation not applicable to datasets of this type
mount zfs

2 Answers

  1. As of today, ZFS on Linux (ZoL) now also supports read-only access to snapshots via a invisible (not hidden, invisible) directory in the root of the dataset. 

    # ls -a /tank/test
./  ../  boot.tar  text.tar  text.tar.2
# cd /tank/test/.zfs/
# ls -a
./  ../  shares/  snapshot/

    In the snapshot directory you'll find read-only copies of all your snapshots.

    You can make .zfs visible via zfs set snapdir=visible tank/test.

    Source: https://pthree.org/2012/12/19/zfs-administration-part-xii-snapshots-and-clones/

    • 34
  2. Best Answer

    Running ZoL, just use the regular mount command like this:

    mount -t zfs tank/www@zfs-auto-snap_hourly-2012-02-11-1917 /mnt/snapshot/tank/www

    Dismount it like this:

    umount /mnt/snapshot/tank/www

    This is a bug that is being tracked at https://github.com/zfsonlinux/zfs/issues/173

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