[PVE-User] ZFS: different upgrade level in cluster for replica and migration...

[Marco Gaiarin]

> After upgrading to PVE8 we are in the process of upgrading pool, but we
> cannot upgrade the sparring partner server because of known GRUB
> compatibility.
> 
> We have upgraded a test server, and replica works as expected, so seems that
> replica (and migration) does not depend on zpool upgrade status.
> 
> But i ask here confirmation.

I try to restate hoping on feedback; current situation:

Main server, UEFI/systemd-boot, done a 'zpool upgrade':

 root at sdpve1:~# zpool status rpool
   pool: rpool
  state: ONLINE
   scan: scrub repaired 0B in 00:11:24 with 0 errors on Sun Jan 11 00:35:25 2026
 config:
 
 	NAME                                      STATE     READ WRITE CKSUM
 	rpool                                     ONLINE       0     0     0
 	  mirror-0                                ONLINE       0     0     0
 	    ata-MTFDDAK480TDT_2112303EC385-part3  ONLINE       0     0     0
 	    ata-MTFDDAK480TDT_2112303EC3A2-part3  ONLINE       0     0     0
 
 errors: No known data errors

Sparring partner server, BIOS/GRUB, NOT done a 'zpool upgrade' for the known
GRUB incompatibility with the new zpool format:

 root at sdpve2:~# zpool status rpool
   pool: rpool
  state: ONLINE
 status: Some supported and requested features are not enabled on the pool.
 	The pool can still be used, but some features are unavailable.
 action: Enable all features using 'zpool upgrade'. Once this is done,
 	the pool may no longer be accessible by software that does not support
 	the features. See zpool-features(7) for details.
   scan: scrub repaired 0B in 01:02:57 with 0 errors on Sun Jan 11 01:26:58 2026
 config:
 
 	NAME                                        STATE     READ WRITE CKSUM
 	rpool                                       ONLINE       0     0     0
 	  mirror-0                                  ONLINE       0     0     0
 	    ata-ST1000NM004A-2MN130_WRF08R4V-part3  ONLINE       0     0     0
 	    ata-ST1000NM004A-2MN130_WRF08GWM-part3  ONLINE       0     0     0
 
 errors: No known data errors

replica and migration between the two server work as expected, i'm simply
asking if this can be a source of trouble or i'm safe.


Thanks.

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