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

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

[Marco Gaiarin]

We have a set of clusters composed of two servers, installed on PVE6; main
server get installed as UEFI and use systemd-bootd; sparring partner server
was installed in legacy mode, and so use GRUB.

Some critical VMs get replicated from the two nodes.


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.


Thanks.

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Re: [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@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@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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