Clarification request – SAN FC shared storage, Proxmox snapshots and Veeam backup compatibility

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katti

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Dec 20, 2025
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Hello,

I am currently running a Proxmox VE 9.1.4 cluster with two nodes and a QDevice for quorum. My shared storage is an HP 3PAR SAN connected via Fibre Channel (FC).

Current Configuration:

  • Storage Type: LVM (Shared)
  • Connection: Fibre Channel
  • Disk Format: RAW
  • Backup Solution: Veeam Backup for Proxmox VE (using the official plugin)
The Challenge:I am unable to perform live backups with Veeam

Questions:

  1. Is there a recommended way to enable snapshot support on a shared FC LUN without moving to Ceph?
  2. Would moving from LVM to a clustered file system (like OCFS2 or GFS2) declared as a "Shared Directory" in Proxmox be a supported way to use .qcow2 files and thus enable snapshots?
  3. Are there any specific storage plugins or configurations for HP 3PAR that allow thin-provisioning/snapshots in a shared environment?
Thank you for your help.
 
Hi @katti,
You do not need storage snapshots for Veeam backup of any type of storage pool in PVE.

1 Yes, you can have snapshots with FC SAN by using new tech-preview feature: https://forum.proxmox.com/threads/proxmox-ve-9-lvm-snapshot-feature-still-tech-preview.175210/

2 Using QCOW on any file system is a supported way to use QCOW. Using QCOW enables you to use snapshots. Using OCFS2 or GFS is not officially supported by PVE, as in - it is not tested.

3 I am not aware of any official 3PAR plugins. Its unlikely that one would be developed based on where in technology lifecycle the 3PAR storage is. You can use your SAN with above mentioned experimental feature. There may be still some wrinkles to work out there, i.e. https://forum.proxmox.com/threads/possible-bug-with-qemu-img-zeroinit-and-lvm.180171


Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
 
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katti said:
hello @bbgeek17

https://community.veeam.com/blogs-a...xi-sACEl-C6qpnR4fQ_aem_5C3vGQ0lI0K007TJIS2WKg

FYI
Click to expand...
Thank you for the link @katti.
It so happens that we, at Blockbridge, are somewhat familiar with how Veeam operates:
https://forums.veeam.com/proxmox-ve-f79/fyi-potential-data-corruption-issue-with-proxmox-t95796.html

The forum post you referenced does not spell it out, but the changes in PVE that were needed to implement block level snapshots required a new virtual block driver. This broke Veeam plugin until Veeam updated the plugin to accommodate for the change.

As far as we know, Veeam continues to have unique integration with VMware (not available for PVE) in its ability to initiate storage snapshots and backup data from snapshot/clone.

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
 
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