doc/cephfs: add note for config option pause_purging and pause_cloning

Update documentation for add information about mgr/vol config options
"pause_purging" and "pause_cloning".

Signed-off-by: Rishabh Dave <ridave@redhat.com>
(cherry picked from commit 1f0bfe1c599769ac67d3b1b41f37bb3482e27839)

diff --git a/doc/cephfs/fs-volumes.rst b/doc/cephfs/fs-volumes.rst
index b745252f1ea659ccc969499faa13b435ab55897b..1c478c4dbf99c66d2f7a1e1a4adc451897e5b2cf 100644 (file)
--- a/doc/cephfs/fs-volumes.rst
+++ b/doc/cephfs/fs-volumes.rst
@@ -951,6 +951,32 @@ Configure the maximum number of concurrent clone operations. The default is 4:
 
    ceph config set mgr mgr/volumes/max_concurrent_clones <value>
 
+Pause the threads that asynchronously purge trashed subvolumes. This option is
+useful during cluster recovery scenarios:
+
+.. prompt:: bash #
+
+    ceph config set mgr/volumes/pause_purging true
+
+To resume purging threads:
+
+.. prompt:: bash #
+
+    ceph config set mgr/volumes/pause_purging false
+
+Pause the threads that asynchronously clone subvolume snapshots. This option is
+useful during cluster recovery scenarios:
+
+.. prompt:: bash #
+
+    ceph config set mgr/volumes/pause_cloning true
+
+To resume cloning threads:
+
+.. prompt:: bash #
+
+    ceph config set mgr/volumes/pause_cloning false
+
 Configure the ``snapshot_clone_no_wait`` option:
 
 The ``snapshot_clone_no_wait`` config option is used to reject clone-creation

diff --git a/doc/cephfs/troubleshooting.rst b/doc/cephfs/troubleshooting.rst
index c5c956cf667664cf716d9ce61e79680a182701e2..492313a9da0271256d0158fd660334ddec2a062b 100644 (file)
--- a/doc/cephfs/troubleshooting.rst
+++ b/doc/cephfs/troubleshooting.rst
@@ -129,6 +129,31 @@ things to do:
   That prevents any clients from establishing new sessions with the MDS.
 
 
+* **Turn off async purge threads** The volumes plugin spawns threads for
+  asynchronously purging trashed/deleted subvolumes. To help troubleshooting or
+  recovery effort, these purge threads can be disabled using:
+
+.. code:: bash
+
+    ceph config set mgr mgr/volumes/pause_purging true
+
+  To resume purging run::
+
+    ceph config set mgr mgr/volumes/pause_purging false
+
+* **Turn off async cloner threads** The volumes plugin spawns threads for
+  asynchronously cloning subvolume snapshots. To help troubleshooting or
+  recovery effort, these cloner threads can be disabled using:
+
+.. code:: bash
+
+    ceph config set mgr mgr/volumes/pause_cloning true
+
+  To resume cloning run::
+
+    ceph config set mgr mgr/volumes/pause_cloning false
+
+
 
 Expediting MDS journal trim
 ===========================