Replace a two disk mirror within a ZFS pool with a single larger disk
Question
I have a ZFS pool set-up like this in an HP Microserver. Each disk is 3TB in size and all server disk bays are filled:
pool: disks
state: ONLINE
scan: scrub repaired 0B in 15h50m with 0 errors on Sun Sep 13 16:14:06 2020
config:
NAME STATE READ WRITE CKSUM
disks ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
ata-Hitachi_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ONLINE 0 0 0
ata-Hitachi_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
ata-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ONLINE 0 0 0
ata-Hitachi_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ONLINE 0 0 0
errors: No known data errors
Is it possible to migrate, for example, mirror-1 to a single larger 10TB drive?
If so, what is the recommended way of doing this?
The ultimate plan would be to move to this arrangement, where each disk is 10TB:
NAME STATE READ WRITE CKSUM
disks ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
ata-Hitachi_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
ata-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ONLINE 0 0 0
mirror-2 ONLINE 0 0 0
ata-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ONLINE 0 0 0
1 answers
solution1
3 2020-10-02 07:27:58
Yes. Replace one of the disks in a mirror with a larger drive, wait for it to resilver, then detach the other drive. It will turn the vdev into a single, non-mirrored disk.
Be aware that if you lose that disk, you will lose the entire pool, and without redundancy probability of data loss is non-trivial.
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