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Add note on RBD volume snapshots when snapshot.backup.to.secondary is false #688

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Add note on RBD volume snapshots when snapshot.backup.to.secondary is false #688

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6 changes: 6 additions & 0 deletions source/adminguide/storage.rst
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Expand Up @@ -1351,6 +1351,12 @@ to a different directory in the same primary storage as the volume; if it is tru
to the secondary storage. If the snapshot is being taken in a file-based storage (NFS, SharedMountPoint, Local),
it will be copied directly to its final storage location, according to the configuration.

.. note::
If ``snapshot.backup.to.secondary`` is false and the volume is on RBD (Ceph) primary storage, the Volume
Snapshots are kept in the storage layer, as RBD snapshots of the volume's image. Deleting such a volume
will therefore first delete all of its Volume Snapshots, as an RBD image cannot be removed while it still
has snapshots.

Since 4.21.0.0, ACS supports incremental snapshots for the KVM hypervisor when using file-based storage (NFS, SharedMountPoint, Local),
to enable incremental snapshots the ``kvm.incremental.snapshot`` configuration must be enabled. Furthermore, in order to take incremental snapshots
the KVM host must have at least Libvirt version 7.6.0+ and qemu version 6.1+. The size of the snapshot chains
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