Subject: Re: [zfs-discuss] Adding mirrors to an existing zfs-pool
Date: Tue, 26 Jul 2011 08:54:38 -0600
From: Cindy Swearingen <cindy.swearin...@oracle.com>
To: Bernd W. Hennig <consult...@hennig-consulting.com>
References: <342994905.11311662049567.JavaMail.Twebapp@sf-app1>
Hi Bernd,
If you are talking about attaching 4 new disks to a non redundant pool
with 4 disks, and then you want to detach the previous disks then yes,
this is possible and a good way to migrate to new disks.
The new disks must be the equivalent size or larger than the original
disks.
See the hypothetical example below.
If you mean something else, then please provide your zpool status
output.
Thanks,
Cindy
# zpool status tank
pool: tank
state: ONLINE
scan: resilvered 1018K in 0h0m with 0 errors on Fri Jul 22 15:54:52 2011
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
c4t1d0 ONLINE 0 0 0
c4t2d0 ONLINE 0 0 0
c4t3d0 ONLINE 0 0 0
c4t4d0 ONLINE 0 0 0
# zpool attach tank c4t1d0 c6t1d0
# zpool attach tank c4t2d0 c6t2d0
# zpool attach tank c4t3d0 c6t3d0
# zpool attach tank c4t4d0 c6t4d0
The above syntax will create 4 mirrored pairs of disks.
Attach each new disk, wait for it to resilver, attach the next disk,
resilver, and so on. I would scrub the pool after resilvering is
complete, and check fmdump to ensure all new devices are operational.
When all the disks are replaced and the pool is operational, detach
the original disks.
# zpool detach tank c4t1d0
# zpool detach tank c4t2d0
# zpool detach tank c4t3d0
# zpool detach tank c4t4d0
On 07/26/11 00:33, Bernd W. Hennig wrote:
G'Day,
- zfs pool with 4 disks (from Clariion A)
- must migrate to Clariion B (so I created 4 disks with the same size,
avaiable for the zfs)
The zfs pool has no mirrors, my idea was to add the new 4 disks from
the Clariion B to the 4 disks which are still in the pool - and later
remove the original 4 disks.
I only found in all example how to create a new pool with mirrors
but no example how to add to a pool without mirrors a mirror disk
for each "disk" in the pool.
- is it possible to add disks to each disk in the pool (they have different
sizes, so I have exact add the correct disks form Clariion B to the
original disk from Clariion B)
- can I later "remove" the disks from the Clariion A, pool is intact, user
can work with the pool
??
Sorry for the beginner questions....
Tnx for help
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