How to Fix Proxmox PVE can’t create ZFS pool @Liv4IT

Uploaded August 2023 | Updated September 2026, 2 weeks ago

How to Fix Proxmox PVE can’t create ZFS pool

ZFS is a combined file system and logical volume manager designed by Sun Microsystems.
By using ZFS, its possible to achieve maximum enterprise features with low budget hardware.

General ZFS advantages:
Easy configuration and management with Proxmox VE GUI and CLI.
- Reliable
- Protection against data corruption
- Data compression on file system level
- Snapshots
- Copy-on-write clone
- Various raid levels: RAID0, RAID1, RAID10, RAIDZ-1, RAIDZ-2, RAIDZ-3, dRAID, dRAID2, dRAID3
- Can use SSD for cache
- Self healing
- Open Source
- Encryption

When trying to create a ZFS pool in Proxmox VE (PVE) or other platforms, we get an error like below

command ‘/sbin/zpool create -o ‘ashift=12′ mirror /dev/disk/by-id/xxxxxx /dev/disk/by-id/yyyyyy’ failed: exit code 1

Usually this error will appear, if we are trying to create a ZFS pool with disks which has existing partition tables or disks with different size.
- One of the disks has ext4 format or NTFS or any other partition tables etc.
- One of the disk is 1TB, another disk is 500G, we want to create a ZFS mirror or RAIDz etc.

Nevertheless, if we have to create a ZFS pool with disks that have existing partitions and in different size, yes we can still do it. In this case, we can use the -f option to force it to create the ZFS pool.

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