[OpenIndiana-discuss] ZFS Rollback Question

[Timothy Coalson]

On Fri, Mar 8, 2013 at 6:18 PM, DormitionSkete at hotmail.com <
dormitionskete at hotmail.com> wrote:

>
> On Mar 8, 2013, at 5:04 PM, Timothy Coalson wrote:
>
> > Correction to 1)...first off, you did use -r, but second, from the man
> page:
> >
> > "       The -rR options do not  recursively  destroy  the  child
> >         snapshots  of  a  recursive snapshot. Only the top-level
> >         recursive snapshot  is  destroyed  by  either  of  these
> >         options.  To  completely roll back a recursive snapshot,
> >         you must rollback the individual child snapshots."
> >
> > Tim
> >
>
> Ok.  Now I'm real confused.  Assuming I had done something like this:
>
> zfs snapshot rpool/zones/tomcat/ROOT/zbe at whatever
>

Actually, you would have needed to use snapshot -r on the zone path
(without ROOT/zbe) for my answer to be relevant, my bad.


> Done my work.
>
> In the meantime, other auto snapshots were created...
>
> This would not have worked:
>
> zfs rollback -r rpool/zones/tomcat/ROOT/zbe at whatever
>

That would have worked with your changed snapshot line, yes.


> ?
>
> What would I have had to do to correct this?  Roll back each snapshot
> successively?  That could be kind of unpleasant if a lot of time had passed
> and a person needed to rollback through a lot of snapshots.
>


If you had used "zfs snapshot -r rpool/zones/tomcat at whatever", to get rid
of all newer snapshots and changes on all the filesystems, you would need
to do zfs rollback -r on all of:

rpool/zones/tomcat
rpool/zones/tomcat/ROOT
rpool/zones/tomcat/ROOT/zbe

However, the first two wouldn't really matter, since those filesystems are
empty, only the third would cause changes to the zone's files.

So, I guess the lesson learned is: don't do snapshots on zone paths without
ROOT/zbe, recursive or otherwise.

Tim