ctdb-daemon: Add AllowMixedVersions tunable

[samba.git] / ctdb / doc / ctdb-tunables.7.xml

diff --git a/ctdb/doc/ctdb-tunables.7.xml b/ctdb/doc/ctdb-tunables.7.xml
index e3d818049cd8e2d1a048899384818dfbf41b2fde..d0bb4508e240753bc639ef59d45f47d7a77e5e88 100644 (file)
--- a/ctdb/doc/ctdb-tunables.7.xml
+++ b/ctdb/doc/ctdb-tunables.7.xml
@@ -52,6 +52,30 @@
       </para>
     </refsect2>
 
+    <refsect2>
+      <title>AllowMixedVersions</title>
+      <para>Default: 0</para>
+      <para>
+       CTDB will not allow incompatible versions to co-exist in
+       a cluster.  If a version mismatch is found, then losing CTDB
+       will shutdown.  To disable the incompatible version check,
+       set this tunable to 1.
+      </para>
+      <para>
+       For version checking, CTDB uses major and minor version.
+       For example, CTDB 4.6.1 and CTDB CTDB 4.6.2 are matching versions;
+       CTDB 4.5.x and CTDB 4.6.y do not match.
+      </para>
+      <para>
+       CTDB with version check support will lose to CTDB without
+       version check support.  Between two different CTDB versions with
+       version check support, one running for less time will lose.
+       If the running time for both CTDB versions with version check
+       support is equal (to seconds), then the older version will lose.
+       The losing CTDB daemon will shutdown.
+      </para>
+    </refsect2>
+
     <refsect2>
       <title>AllowUnhealthyDBRead</title>
       <para>Default: 0</para>