[Note: This discussion started in another thread
Subject: about backup and mirrored pools
but the subject has been significantly changed so started a new
thread]
Bob Friesenhahn <bfrie...@simple.dallas.tx.us> writes:
> Luckily, since you are using mirrors, you can easily migrate disks
> from your existing extra pools to the coalesced pool. Just make sure
> to scrub first in order to have confidence that there won't be data
> loss.
Reading some of the info at the migration documentation:
http://docs.huihoo.com/opensolaris/solaris-zfs-administration-guide/html/ch04s06.html
I'm getting a little (read horribly) confused how to go about doing
something like creating a single zpool of 3 sets of currently mirrored
disks that for each pair, constitute a zpool themselves.
So, I have rpool z2 z3. Each has 2 disks setup in mirror
configuration.
zpool list
NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
rpool 466G 377G 88.7G 80% 1.00x ONLINE -
z2 464G 365G 99.1G 78% 1.00x ONLINE -
z3 696G 130G 566G 18% 1.00x ONLINE -
(`zpool status' on all pools is inlined at the end of this post)
Whats confusing me is how to do this when all elements of the new
zpool are already in use as zpools themselves, especially since one of
them is rpool.
`export' apparently at least tries to unmount the pool so taking them
out of service, but I guess whats bugging me is how to create a zpool
when the drives you plan to use are already zpools.
I'd like the existing mirrored sets to become the vdevs (I hope that's
the right term) making up the new zpool. So not sure how to create
the new pool.
My only experience so far has been creating zpools from empty
hard drives I'd installed for that purpose.
Apparently some kind of usage of export/import will get this done.
But the docs at the above address are leaving me too unprepared to
attempt it without some first hand guidance from someone who has done
it. Especially regarding rpool.
Can you create a zpool with no drives/vdevs and then `import' each of the
current pools into it, letting them become the vdevs?
When I export rpool it will be unmounted I guess, so does that have to
be done from a livecd?
In the case I'm describing I guess rpool will be the only pool when
its completed. Is that a sensible thing to do?
Or would it make more sense to leave rpool alone and make a single
zpool of the other two mirrored pairs?
------- --------- ---=--- --------- --------
pool: rpool
state: ONLINE
scrub: scrub completed after 4h36m with 0 errors on Sat Apr 10 07:40:12 2010
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c3d0s0 ONLINE 0 0 0
c3d1s0 ONLINE 0 0 0
errors: No known data errors
pool: z2
state: ONLINE
scrub: scrub completed after 3h44m with 0 errors on Fri Apr 9 06:48:10 2010
config:
NAME STATE READ WRITE CKSUM
z2 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c4d0 ONLINE 0 0 0
c4d1 ONLINE 0 0 0
errors: No known data errors
pool: z3
state: ONLINE
scrub: scrub completed after 0h54m with 0 errors on Thu Apr 8 03:58:45 2010
config:
NAME STATE READ WRITE CKSUM
z3 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c5d0 ONLINE 0 0 0 60.5K repaired
c6d0 ONLINE 0 0 0
errors: No known data errors
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