+https://wiki.samba.org/index.php/LDB_Greater_than_and_Less_than_indexing
+
+Improvements to ldb search performance
+--------------------------------------
+
+Search performance on large LDB databases has been improved by
+reducing memory allocations made on each object.
+
+Improvements to subtree rename performance
+------------------------------------------
+
+Improvements have been made to Samba's handling of subtree renames,
+for example of containers and organisational units, however large
+renames are still not recommended.
+
+CTDB changes
+============
+
+* nfs-linux-kernel-callout now defaults to using systemd service names
+
+ The Red Hat service names continue to be the default.
+
+ Other distributions should patch this file when packaging it.
+
+* The onnode -o option has been removed
+
+* ctdbd logs when it is using more than 90% of a CPU thread
+
+ ctdbd is single threaded, so can become saturated if it uses the
+ full capacity of a CPU thread. To help detect this situation, ctdbd
+ now logs messages when CPU utilisation exceeds 90%. Each change in
+ CPU utilisation over 90% is logged. A message is also logged when
+ CPU utilisation drops below the 90% threshold.
+
+* Script configuration variable CTDB_MONITOR_SWAP_USAGE has been removed
+
+ 05.system.script now monitors total memory (i.e. physical memory +
+ swap) utilisation using the existing CTDB_MONITOR_MEMORY_USAGE
+ script configuration variable.