Various changes to the allocation algorithms: Expect some fallout.

There is a lot to test.

Two new config settings added that are intended to make the code behave
closely to the way it did before - worth a try if you find problems.

WHATS_NEW

@@ -1,5 +1,9 @@
 Version 2.02.85 - 
 ===================================
+  Extend normal policy to allow mirror logs on same devs as images if necessary.
+  Improve cling policy to recognise devs already allocated in the transaction.
+  Improve normal allocation algorithm to include clinging to existing areas.
+  Add allocation/maximise_cling & mirror_logs_require_separate_pvs to lvm.conf.
   Fix metadata balance code to work with recent changes in metadata handling.
   Add old_uuid field to physical_volume and fix pvchange -u for recent changes.
   Allow pvresize on a PV with two metadata areas (for PVs not in a VG).

doc/example.conf.in

@@ -171,6 +171,19 @@ devices {
 #
 #    cling_tag_list = [ "@site1", "@site2" ]
 #    cling_tag_list = [ "@*" ]
+#
+#    Changes made in version 2.02.85 extended the reach of the 'cling'
+#    policies to detect more situations where data can be grouped
+#    onto the same disks.  Set this to 0 to revert to the previous
+#    algorithm.
+#
+#    maximise_cling = 1
+#
+#    Set to 1 to guarantee that mirror logs will always be placed on 
+#    different PVs from the mirror images.  This was the default
+#    until version 2.02.85.
+#
+#    mirror_logs_require_separate_pvs = 0
 #}
 
 # This section that allows you to configure the nature of the

lib/config/defaults.h

@@ -79,6 +79,8 @@
 #define DEFAULT_MAX_PV 0
 #define DEFAULT_MAX_LV 0
 #define DEFAULT_ALLOC_POLICY ALLOC_NORMAL
+#define DEFAULT_MIRROR_LOGS_REQUIRE_SEPARATE_PVS 0
+#define DEFAULT_MAXIMISE_CLING 1
 #define DEFAULT_CLUSTERED 0
 
 #define DEFAULT_MSG_PREFIX "  "