Now I'm migrating to 11.2 NAS4Free and my disks show the 4K / Old Pool not advance Format Errors. Add to that I regret not having a single POOL with multiple vdevs.
So here I'm aiming for a large pool with vdevs on a N4F 11.
Existing Disks & POOLS
POOL1= 8x3TB zfs2 (15.7TB/93% Occupied);
POOL2 = (5x3TB,3x4TB mixed disk size) zfs2 (15.7TB/20% Occupied)
BACKUP = 4x2TB zfs2
N4F 9.2 (Shigawire) / 512B Allocation - No Advance Format
*Disks used are of Multiple Types: WD Reds / WD Purples / Even a WD Green remaining
/ IronWolfOPTION-A
1) Upgrade POOL1 N4F R9.2 pool to latest zfs revision (assuming this has no other side impacts) - Fully used: 14.5TB of 15.7TB
2) Kill POOL2 (BackupData)
3) Add the vdev of POOL2 to POOL1 to net 31.4TB
4) Copy BACKUP Data to main POOL1
OPTION-B
1) Backup Data & Kill Both Pools
2)New Pool with 6disk zfs2 vdevs or 3disk zfs1 vdevs:
Pool TypeX with zfs2 vdev:
X-1) Create 6x3TB zfs2 vdev's (10.4TB Usable)
X-2) Create NEWPOOL with vdev1,vdev2,vdev3 & net 31.2TB
Pool TypeY with zfs1 vdev:
Y-1) Create 3x3TB zfs1 vdev's (5.2TB Usable)
Y-2) Create NEWPOOL with vdev1,vdev2,vdev3,vdev4,vdev5,vdev6 & net 31.2TB
pros of optionA:
-able to maintain POOL1 as is without having to copy data across backup pools
-fastest setup time / lowest disk thrashing
pros of optionB:
-Worried of zfs pool version upgrade in option1 causing any issues on production data or pool loss
option1
-smaller disk qty to building new vdevs (option 1 vdevs use 8 disks zfs2) & better performance with
option2
-even smaller disk qty to building new vdevs (option 1 vdevs use 8 disks zfs2)
-better performance with
cons: need 2 more disks for parity
cons: zfs1 vdevs may not be a good idea?
Above is what I could understand from reading the forums - I'd definitely like a second opinion to decide between option1 & option2 or any other.