[zfs-discuss] is it possible to add a mirror device later?

[Tommaso Boccali]

is there a way to do it "via software" ? (attach remove add detach)....

if not else, it would help me quite a lot to understand the underlying
zfs mechanism ...
thanks

;)

tom

On Sun, Jul 6, 2008 at 10:27 AM, Jeff Bonwick <Jeff.Bonwick at sun.com> wrote:
> I would just swap the physical locations of the drives, so that the
> second half of the mirror is in the right location to be bootable.
> ZFS won't mind -- it tracks the disks by content, not by pathname.
> Note that SATA is not hotplug-happy, so you're probably best off
> doing this while the box is powered off.  Upon reboot, ZFS should
> figure out what happened, update the device paths, and... that's it.
>
> Jeff
>
> On Sun, Jul 06, 2008 at 08:47:25AM +0200, Tommaso Boccali wrote:
>> >
>> > As Edna and Robert mentioned, zpool attach will add the mirror.
>> > But note that the X4500 has only two possible boot devices:
>> > c5t0d0 and c5t4d0.  This is a BIOS limitation.  So you will want
>> > to mirror with c5t4d0 and configure the disks for boot.  See the
>> > docs on ZFS boot for details on how to configure the boot sectors
>> > and grub.
>> > -- richard
>> >
>>
>> uhm, bad.
>>
>> I did not know this, so now the root is
>> bash-3.2# zpool status rpool
>>   pool: rpool
>>  state: ONLINE
>>  scrub: resilver completed after 0h8m with 0 errors on Wed Jul  2 16:09:14 2008
>> config:
>>
>>         NAME          STATE     READ WRITE CKSUM
>>         rpool         ONLINE       0     0     0
>>           mirror      ONLINE       0     0     0
>>             c5t0d0s0  ONLINE       0     0     0
>>             c1t7d0    ONLINE       0     0     0
>>         spares
>>           c0t7d0      AVAIL
>>           c1t6d0      AVAIL
>>
>>
>> while c5t4d0 belongs to a raiz pool:
>>
>> ...
>>           raidz1    ONLINE       0     0     0
>>             c0t4d0  ONLINE       0     0     0
>>             c1t4d0  ONLINE       0     0     0
>>             c5t4d0  ONLINE       0     0     0
>>             c6t7d0  ONLINE       0     0     0
>>             c5t5d0  ONLINE       0     0     0
>>             c5t6d0  ONLINE       0     0     0
>>             c5t7d0  ONLINE       0     0     0
>>             c1t5d0  ONLINE       0     0     0
>> ...
>>
>> is it possible to restore the good behavior?
>> something like
>> - detach c1t7d0 from rpool
>> - detach c5t4d0 from the other pool (the pool still survives since it is raidz)
>> - reattach in reverse order? (and so reform mirror and raidz?)
>>
>> thanks a lot again!!!!
>>
>> tommaso
>> >
>>
>>
>>
>> --
>> Tommaso Boccali
>> INFN Pisa
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>> zfs-discuss mailing list
>> zfs-discuss at opensolaris.org
>> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
>



-- 
Tommaso Boccali
INFN Pisa