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.
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
Hi Francis,
Thanks for confirming. That did the trick. I kept thinking I had to mirror
at the highest level (zpool), then split. I actually did it in one less
step than you mention by using replace instead of attach then detach but
what you said is 100% correct.
zpool replace /root/zfs/disk0
