While the snapshot isn't RW, the clone is and would certainly be helpful
in this case....
Isn't the whole idea to:
0) boot into single-user/boot-archive if you're paranoid (or just quiess
and clone if you feel lucky)
1) "clone" the primary OS instance+relevant-slices & boot into the
primary OS
2) apply "alternate root" patches to the cloned file systems (leaving
the original OS COMPLETELY UNTOUCHED)
(run a DTRACE watch-dog to make sure bugs in patch
pre/post-install don't act against the primary OS instead
of the alternate root.... (this would NEVER happen would
it????))
3) add entries for the cloned file system in GRUB, making them a valid
boot option
(possibly clean up a few /etc/vfstab path issues in the cloned
FS while we're at it)
Boot the clone, or backout to the original ( by booting that menu
option) if not 100% happy...
If you're happy on the clone say after a week, "zfs promote" the clone
to become the primary.
((grub gets cleaned up accordingly so its not confused) and your
backout option is GONE/recycled)
(Wait, we haven't used live-upgrade yet... What to do?)
Thoughts on this scenario working for the zfs-boot initial release?
Thanks,
-- MikeE
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Lin Ling
Sent: Sunday, March 11, 2007 3:49 PM
To: Matty
Cc: zfs-discuss@opensolaris.org
Subject: Re: [zfs-discuss] Re: Re: update on zfs boot support
Matty wrote:
> I am curious how snapshots and clones will be integrated with grub.
> Will it be posible to boot from a snapshot? I think this would be
> useful when applying patches, since you could snapshot / ,/var and
> /opt, patch the system, and revert back (by choosing a snapshot from
> the grub menu) to the snapshot if something went awry. Is this how the
> zfs boot team envisions this working?
You can snapshot/clone, and revert back by choosing the clone from the
grub menu to boot.
Since snapshot is a read-only filesystem, directly booting from it is
not supported for the initial release.
However, it is on our to-investigate list.
Lin
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