Questions about proxmox upgrade 8 to 9

[Giovanni_IT]

Hello,

I have several questions about upgrading from Proxmox 8 to 9.

Here is my configuration:
I have a cluster of 8 Proxmox VEs with VMs distributed across them.
The storage volumes for these VMs are on two iSCSI storage devices.

Here are my questions:
After running pve8to9 --full, I get this:

WARN: Starting with PVE 9, autoactivation will be disabled for new LVM/LVM-thin guest volumes. This system has some volumes that still have autoactivation enabled. Some affected volumes are on shared LVM storages, which has known issues (Bugzilla #4997). Disabling autoactivation for those is strongly recommended!

You can run the following command to disable autoactivation for existing LVM/LVM-thin guest volumes:
/usr/share/pve-manager/migrations/pve-lvm-disable-autoactivation

- Should this be done BEFORE or AFTER migration?
- Is there a risk of disabling autoactivation on both iSCSI storages when one Proxmox is running version 9 and the others are running version 8 awaiting upgrade?
- Is there a risk of data corruption on volumes stored on VMs that are still running Proxmox VE version 8?
- Will my VMs on Proxmox 8 (awaiting upgrade) but with LVM volumes that have autoactivation disabled still work?

Thanks for your support!

 

[Lokytech]

I'm speaking after finishing my first migration of 24 servers. What i can say is :

- Should this be done BEFORE or AFTER migration?

BEFORE

- Is there a risk of disabling autoactivation on both iSCSI storages when one Proxmox is running version 9 and the others are running version 8 awaiting upgrade?

The risk is a full shutdown. You should not run with fragmented versions for a long period of time. You can migrate VM from 8 to 9 but not from 9 to 8.

- Is there a risk of data corruption on volumes stored on VMs that are still running Proxmox VE version 8?

There is always a risk. But i did it with to iSCSI backend and nothing happened. LVM stays active of node with their running VM but are disable on node where those VM does not run. Which is ... normal.

- Will my VMs on Proxmox 8 (awaiting upgrade) but with LVM volumes that have autoactivation disabled still work?

Yes. Answer in previous point.