ZFS ZFS snapshot root

J

jbo@

Developer
Is it possible to create & rollback a snapshot directly on the pool level? Or does this need to happen on the dataset level. Basically:
zfs snapshot -r zpool@mybackup

I noticed behavior on my "new" FreeBSD laptop that I would currently describe as "unexpected".
My procedure:
$> zfs snapshot -r zpool@mybackup
$> echo > "Hello World" ~/foo.txt
$> zfs rollback -R zpool@mybackup
$> cat ~/foo.txt

When running the last (4th) command I expect the shell to report that the file ~/foo.txt does not exist anymore as I'd expect it to vanish when rolling back to the snapshot taken prior to the file's creation. However, the shell just happily prints Hello World.

What (obvious?) thing am I missing here?
 
zfs rollback does not act recursively. Once recursive snapshot is created the snaps continue to live on their own. With the third command you rolled back only /zpool. The rollback -r and -R command line options stand for “recent”.

Appearantly there is no command to do a recursive rollback even if all sub-zfs have a snapshot with the that name.
 
joel.bodenmann said:
Is it possible to create & rollback a snapshot directly on the pool level? Or does this need to happen on the dataset level. Basically:
zfs snapshot -r zpool@mybackup

I noticed behavior on my "new" FreeBSD laptop that I would currently describe as "unexpected".
My procedure:
$> zfs snapshot -r zpool@mybackup
$> echo > "Hello World" ~/foo.txt
$> zfs rollback -R zpool@mybackup
$> cat ~/foo.txt

When running the last (4th) command I expect the shell to report that the file ~/foo.txt does not exist anymore as I'd expect it to vanish when rolling back to the snapshot taken prior to the file's creation. However, the shell just happily prints Hello World.

What (obvious?) thing am I missing here?
Click to expand...
I think only the dataset level. I have never seen anyone doing a zpool snapshot.
Could you post the output of zfs list -t snapshot?
 
I came here seeking an answer to the same question, with the same results.

My question is what do, to have ZFS back up and restore my whole drive? Including /root

-JJ
 
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