|Description |PVE type |Level |Shared|Snapshots|Stable
|ZFS (local) |zfspool |file |no |yes |yes
|Directory |dir |file |no |no^1^ |yes
+|BTRFS |btrfs |file |no |yes |technology preview
|NFS |nfs |file |yes |no^1^ |yes
|CIFS |cifs |file |yes |no^1^ |yes
|Proxmox Backup |pbs |both |yes |n/a |yes
Default image format (`raw|qcow2|vmdk`)
+preallocation::
+
+Preallocation mode (`off|metadata|falloc|full`) for `raw` and `qcow2` images on
+file-based storages. The default is `metadata`, which is treated like `off` for
+`raw` images. When using network storages in combination with large `qcow2`
+images, using `off` can help to avoid timeouts.
WARNING: It is not advisable to use the same storage pool on different
{pve} clusters. Some storage operation need exclusive access to the
include::pve-storage-btrfs.adoc[]
+include::pve-storage-zfs.adoc[]
+
ifdef::manvolnum[]
include::pve-copyright.adoc[]