On Tue, Jul 1, 2008 at 4:34 PM, <Madhan.Balasubramanian at sun.com> wrote:
> Hi,
>
> I am having difficulty understanding ZFS rollback option.
> I'll illustrate it with an example:
>
> 1.) I have created 2 FS with the following structure:
>
> bash-3.00# zfs list
> NAME USED AVAIL REFER MOUNTPOINT
> test 137K 19.6G 26.5K /test
> test/testfs 50K 19.6G 25.5K /test/testfs
> test/testfs/1 24.5K 19.6G 24.5K /test/testfs/1
>
>
> 2.) I take a snapshot of the complete pool:
>
> bash-3.00# zfs snapshot -r test at complete
>
> 3.) Now I touch a file to differentitate between the snapshot and current
> state of the FS.
>
> bash-3.00# touch /test/testfs/1/test
>
> 4.) I rollback to the snapshot:
>
> bash-3.00# zfs rollback test at complete
> bash-3.00# zfs list
> NAME USED AVAIL REFER MOUNTPOINT
> test 205K 19.6G 26.5K /test
> test at complete 0 - 26.5K -
> test/testfs 94K 19.6G 25.5K /test/testfs
> test/testfs at complete 21.5K - 25.5K -
> test/testfs/1 47K 19.6G 24.5K /test/testfs/1
> test/testfs/1 at complete 22.5K - 24.5K -
>
> 5.) Ideally, I'd expect that the file that was created after taking snapshot
> be gone. However, I find that it is still present.
> bash-3.00# ls -l /test/testfs/1/test
> -rw-r--r-- 1 root root 0 Jul 1 04:40 /test/testfs/1/test
>
> I'll be glad if someone can help me understand why the file hasn't been
> rolled back.
You should be using zfs rollback -r ... otherwise the individual
filesystem snapshots are not rolled back.
Regards,
Moinak.
>
> Best Regards,
> Madhan Kumar
>
>
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