From 6d50daecb4ce673331c9e56cbd7b976416c10695 Mon Sep 17 00:00:00 2001
From: Anthony D'Atri <anthonyeleven@users.noreply.github.com>
Date: Fri, 11 Apr 2025 10:29:52 -0400
Subject: [PATCH] doc/cephadm: Add admonition re restarting an OSD service

Signed-off-by: Anthony D'Atri <anthonyeleven@users.noreply.github.com>
(cherry picked from commit 524db4609f5f0b4639828b327cfc972243e08ce7)
---
 doc/cephadm/operations.rst   | 18 ++++++++++++------
 doc/cephadm/services/osd.rst |  7 +++++++
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/doc/cephadm/operations.rst b/doc/cephadm/operations.rst
index 716f260dae696..1f72445ef66b0 100644
--- a/doc/cephadm/operations.rst
+++ b/doc/cephadm/operations.rst
@@ -51,17 +51,23 @@ You can stop, start, or restart a daemon with:
 
 .. prompt:: bash #
 
-   ceph orch daemon stop <name>
-   ceph orch daemon start <name>
-   ceph orch daemon restart <name>
+   ceph orch daemon stop <daemonid>
+   ceph orch daemon start <daemonid>
+   ceph orch daemon restart <daemonid>
 
 You can also do the same for all daemons for a service with:   
 
 .. prompt:: bash #
 
-   ceph orch stop <name>
-   ceph orch start <name>
-   ceph orch restart <name>
+   ceph orch stop <serviceid>
+   ceph orch start <serviceid>
+   ceph orch restart <serviceid>
+
+.. note::
+    It is usually not safe to run ``ceph orch restart osd.myosdservice`` on a
+    running cluster, as attention is not paid to CRUSH failure domains, and
+    parallel OSD restarts may lead to temporary data unavailability or in rare
+    cases even data loss.
 
 
 Redeploying or reconfiguring a daemon
diff --git a/doc/cephadm/services/osd.rst b/doc/cephadm/services/osd.rst
index e4f68d20b88d7..928cc91282946 100644
--- a/doc/cephadm/services/osd.rst
+++ b/doc/cephadm/services/osd.rst
@@ -1144,6 +1144,13 @@ This procedure assumes the existence of two hosts: ``ceph01`` and ``ceph04``.
 post pertinent to its development can be seen here:*
 `Eugen Block's "Cephadm: Activate existing OSDs" blog post <https://heiterbiswolkig.blogs.nde.ag/2025/02/06/cephadm-activate-existing-osds/>`_.
 
+.. note::
+    It is usually not safe to run ``ceph orch restart osd.myosdservice`` on a
+    running cluster, as attention is not paid to CRUSH failure domains, and
+    parallel OSD restarts may lead to temporary data unavailability or in rare
+    cases even data loss.
+
+
 Further Reading
 ===============
 
-- 
2.39.5