doc/cephadm/administration: add a note about the 'removed' dir

(and other paths)

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/doc/cephadm/administration.rst b/doc/cephadm/administration.rst
index afc1dd21cfec0af2fda952f47188e4e18e3c588a..4daa59ceaa623faab61afd8f23afacf653749a30 100644 (file)
--- a/doc/cephadm/administration.rst
+++ b/doc/cephadm/administration.rst
@@ -28,6 +28,26 @@ To clear this value use the command:
 
     # ceph cephadm clear-ssh-config
 
+Data location
+=============
+
+Cephadm daemon data and logs in slightly different locations than older
+versions of ceph:
+
+* ``/var/log/ceph/<cluster-fsid>`` contains all cluster logs.  Note
+  that by default cephadm logs via stderr and the container runtime,
+  so these logs are normally not present.
+* ``/var/lib/ceph/<cluster-fsid>`` contains all cluster daemon data
+  (besides logs).
+* ``/var/lib/ceph/<cluster-fsid>/<daemon-name>`` contains all data for
+  an individual daemon.
+* ``/var/lib/ceph/<cluster-fsid>/crash`` contains crash reports for
+  the cluster.
+* ``/var/lib/ceph/<cluster-fsid>/removed`` contains old daemon
+  data directories for stateful daemons (e.g., monitor, prometheus)
+  that have been removed by cephadm.
+
+
 Health checks
 =============