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-rw-r--r--docs-xml/smbdotconf/misc/ctdblocktimewarnthreshold.xml26
1 files changed, 19 insertions, 7 deletions
diff --git a/docs-xml/smbdotconf/misc/ctdblocktimewarnthreshold.xml b/docs-xml/smbdotconf/misc/ctdblocktimewarnthreshold.xml
index 149d8d67e3..a3289a93bc 100644
--- a/docs-xml/smbdotconf/misc/ctdblocktimewarnthreshold.xml
+++ b/docs-xml/smbdotconf/misc/ctdblocktimewarnthreshold.xml
@@ -4,13 +4,25 @@
advanced="1"
xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
<description>
- <para>In a cluster, ctdb is very unhappy if tdb database locks
- are held for extended periods of time. This parameter adds a
- warning threshold in milliseconds. If Samba holds a lock for
- longer that ctdb locktime warn threshold milliseconds, a debug
- level 0 message is printed when the lock is released. This is
- mainly a debugging aid for post-mortem analysis.</para>
- <para>If this parameter is set to 0, no message is printed.</para>
+
+ <para>
+ In a cluster environment using Samba and ctdb it is critical
+ that locks on central ctdb-hosted databases like locking.tdb
+ are not held for long. With the current Samba architecture
+ it happens that Samba takes a lock and while holding that
+ lock makes file system calls into the shared cluster file
+ system. This option makes Samba warn if it detects that it
+ has held locks for the specified number of milliseconds. If
+ this happens, <emphasis>smbd</emphasis> will emit a debug level 0
+ message into its logs and potentially into syslog. The most likely
+ reason for such a log message is that an operation of the cluster
+ file system Samba exports is taking longer than expected.
+ The messages are meant as a debugging aid for potential
+ cluster problems.
+ </para>
+
+ <para>The default value of 0 disables this logging.</para>
+
</description>
<value type="default">0</value>
</samba:parameter>