Upgrading from 3.4-1 to latest - break ZFS mirror raid??

[den]

hey guys -

Im looking to upgrade proxmox to the latest from my current version.

Current Version:

proxmox-ve-2.6.32: 3.3-147 (running kernel: 2.6.32-37-pve)
pve-manager: 3.4-1 (running version: 3.4-1/3f2d890e)
pve-kernel-2.6.32-37-pve: 2.6.32-147​

I have a software mirrored disks as below (I used the install process in 3.4 to create a ZFS mirrored raid.).

What I was going to do was
1. Disconnect one of the sda3 drives (disk-B) (pull the cables out)
2. Boot up on 1 drive only. (disk-A)
3. Perform Upgrade
4. If upgrade successful, then power down and insert the original disk (disk-B) that was removed.
5. Power up - which I hope the old disk (disk-B) will get rebuild with the latest data from (disk-A).

6. If upgrade is unsuccessful, then
6.1 Remove (disk-A), and insert origional (disk-B)
6.2 Boot and test
6.3 Power down, insert (disk-A) and I hope (disk-A) will get rebuild with the latest data of (disk-B).


My question is this - Will my steps above work as intended?




pool: rpool
state: ONLINE
scan: scrub repaired 0 in 3h51m with 0 errors on Sun Apr 10 06:51:37 2016
config:

NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
sda3 ONLINE 0 0 0 //(disk-A)
sdb3 ONLINE 0 0 0 //(disk-B)

errors: No known data errors