You can always add a new VDEV to the pool (man zpool-add). Expanding a
raidz2 VDEV itself is only possible with ZFS 2.3 AFAIU and we do not
ship that yet [0].
But if this is for VM storage, you might want to consider a ZFS pool of
multiple mirrored VDEVs. [1] has more details.
While performance might not be much of an issue anymore with recent
NVMEs that provide a ton of IOPS, the additional space usage might still
be something to think about in a raidz pool used for VMs (ZVOL).
[0]
https://forum.proxmox.com/threads/proxmox-ve-8-4-released.164821/#post-762367
[1]
https://pve.proxmox.com/pve-docs/pve-admin-guide.html#sysadmin_zfs_raid_considerations
On 2025-05-20 03:24, Randy Bush wrote:
running 8.4.1 with images on 4x2tb raidz2 ssds (zfs-2.2.7-pve2). we
want to double the space. the net of a million lies says all sorts of
things about expanding raidz2. as we do full replication, we could just
create a new pool for replocation and call it a day. but i am curious
if we can just expand the current pool. my reading says doubtful, but
am not deeply clued.
randy
---
https://forum.proxmox.com/threads/raidz-expansion.135413/
https://github.com/openzfs/zfs/pull/15022
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