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new 1b8984bc Add docs regarding Disk-only File-based Storage Instance
Snapshot on KVM (#541)
1b8984bc is described below
commit 1b8984bc5010ef2f219d93945efecee01154d70c
Author: João Jandre <[email protected]>
AuthorDate: Thu Aug 28 05:20:12 2025 -0300
Add docs regarding Disk-only File-based Storage Instance Snapshot on KVM
(#541)
---
source/adminguide/virtual_machines.rst | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/source/adminguide/virtual_machines.rst
b/source/adminguide/virtual_machines.rst
index 786ec6d3..545e44d2 100644
--- a/source/adminguide/virtual_machines.rst
+++ b/source/adminguide/virtual_machines.rst
@@ -1265,6 +1265,19 @@ When the snapshotting is complete, the Instance is
thawed.
You can use this functionality on Instances with raw block storages (E.g.
Ceph/SolidFire/Linstor).
+Disk-only File-based Storage Instance Snapshot on KVM
+-----------------------------------------------------
+
+Since version 4.21, CloudStack supports incremental disk-only instance
snapshots for VMs on KVM that are running on file-based storages (NFS, local,
shared mount point).
+Different from :ref:`Storage-based-Instance-Snapshots-on-KVM`, the VM is not
frozen by default; only if the ``quiescevm`` parameter is provided.
Furthermore, if ``quiescevm`` is true
+the VM is only frozen during the operation of creating the deltas on the
volumes of the VM, thus the downtime is minimal.
+
+When using this snapshot strategy, you will not be able to create volume
snapshots, as these two features are not compatible. If you want to use both
volume snapshots and instance snapshots
+at the same time, you may inform the value
``KvmFileBasedStorageVmSnapshotStrategy`` on the
``vmSnapshot.strategies.exclude`` configuration, so that
+this strategy is not used and the
:ref:`Storage-based-Instance-Snapshots-on-KVM` feature is used instead.
+
+More information on this feature may be found in the `specification
<https://github.com/apache/cloudstack/issues/9524>`_.
+
Limitations on Instance Snapshots
---------------------------------
