Hi Matthew,
Just attach disk3 to existing mirrored tlv
Wait for resilvering to complete
Dettach disk0 and disk1
This will leave you with only disk3 in your pool.
You will loose ZFS redundancy fancy features (self healing, ...).
# zpool create test mirror /export/disk0 /export/disk1
# zpool status
pool: test
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
test ONLINE 0 0 0
mirror ONLINE 0 0 0
/export/disk0 ONLINE 0 0 0
/export/disk1 ONLINE 0 0 0
errors: No known data errors
# zpool attach test /export/disk1 /export/disk3
# zpool status
pool: test
state: ONLINE
scrub: resilver completed after 0h0m with 0 errors on Thu Mar 26
19:55:24 2009
config:
NAME STATE READ WRITE CKSUM
test ONLINE 0 0 0
mirror ONLINE 0 0 0
/export/disk0 ONLINE 0 0 0
/export/disk1 ONLINE 0 0 0
/export/disk3 ONLINE 0 0 0 71.5K resilvered
# zpool detach test /export/disk0
# zpool detach test /export/disk1
# zpool status
pool: test
state: ONLINE
scrub: resilver completed after 0h0m with 0 errors on Thu Mar 26
19:55:24 2009
config:
NAME STATE READ WRITE CKSUM
test ONLINE 0 0 0
/export/disk3 ONLINE 0 0 0 71.5K resilvered
errors: No known data errors
F.
On 03/26/09 08:20, Matthew Angelo wrote:
Assuming I have a zpool which consists of a simple 2 disk mirror.
How do I attach a third disk (disk3) to this zpool to mirror the
existing data? Then split this mirror and remove disk0 and disk1,
leaving a single disk zpool which consist of the new disk3. AKA.
Online data migration.
[root]# zpool status -v
pool: apps
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
apps ONLINE 0 0 0
mirror ONLINE 0 0 0
/root/zfs/disk0 ONLINE 0 0 0
/root/zfs/disk1 ONLINE 0 0 0
errors: No known data errors
The use case here is, we've implemented new Storage. The new (3rd) LUN
is a RAID10 Hitachi SAN with the existing mirror being local SAS Disks.
Back in the VxVM world, this would be done by mirroring the dg then
splitting the mirror. I understand we are moving away from a ZFS
mirror to a single stripe.
Thanks
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