[pve-devel] Volume live migration concurrency

[Andrei Perapiolkin via pve-devel <pve-devel@lists.proxmox.com>]

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From: Andrei Perapiolkin <andrei.perepiolkin@open-e.com>
To: Proxmox VE development discussion <pve-devel@lists.proxmox.com>
Subject: Volume live migration concurrency
Date: Mon, 26 May 2025 10:31:20 -0400
Message-ID: <6f0ab1f6-2d3f-41e3-8750-2567eb5b947d@open-e.com>

Hi Proxmox Community,

I'm curious whether there are any standard or guidelines that govern the 
order in which the methods: /activate_volume, deactivate_volume, path/ 
are called during VM live migration.

Assuming the storage plugin supports `live migration`:

1. Can/path/ be called before /activate_volume?/

2. When /vm /migrates from/node1/ to/node2, /might /activate_volume/ 
on/node2/ be invoked before /deactivate_volume/ has completed on /node1?
/

3. In the context of live migration: Will Proxmox skip calling 
/deactivate_volume/ for snapshots that have already been activated? 
Should the storage plugin explicitly deactivate all snapshots of a 
volume during migration?


Best regards,

Andrei Perepiolkin

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