Proxmox Cluster ZFS shared storage for VM backups/ISO


New Member
Oct 3, 2023
Hello everyone.
I have a configuration of 3 PVE 8 nodes in cluster, and wanted to setup a ZFS storage w/directory for VM backups/ISO etc.
Setup is pretty simple, 2 disks in mirror w/compression lz4 on node 1, which I want to share with other nodes for VM backups.
Created ZFS pool storage shows on all nodes, but problem is that it shows with full capacity only on the node where it was created (5.3TB), and on other nodes it's only 100 GB. I've searched the forum but couldn't find the answer.

What am I doing wrong here?

Is there a better way utilizing 2 disks in RAID1/mirror mainly for VM backup purposes?

- ZFS is not suitable for "shared" storage functionality. It is not a Cluster Aware Filesystem. It is a _local_ filesystem
- On the node where this ZFS pool was created and _mounted_ you see its expected size
- On the nodes where it does not exist, you see the available space of the root filesystem where an empty folder was created

As far as PVE is concerned, based on your screenshots and description, it does not know that there is ZFS involved. You pointed PVE to a directory. What is behind that directory is up to you.

To achieve your goal of having a shared location for backups/ISO you need to export this location either directly from hypervisor or via VM that will play a NAS role. The export would most likely be done via NFS , but can also be CIFS.

Good luck

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