[linux-lvm] [PATCH] man: document that 2 times poolmetadatasize is allocated for lvmthin

[Scott Moser]

diff --git a/man/lvmthin.7_main b/man/lvmthin.7_main
index ce2343183..e21e516c9 100644
--- a/man/lvmthin.7_main
+++ b/man/lvmthin.7_main
@@ -1101,6 +1101,11 @@ specified with the --poolmetadatasize option.
When this option is not
 given, LVM automatically chooses a size based on the data size and chunk
 size.

+The space allocated by creation of a thinpool will include
+a spare metadata LV by default (see "Spare metadata LV").  As a result,
+the VG must have enough space for the --size option plus twice
+the specified (or calculated) --poolmetadata value.
+
 It can be hard to predict the amount of metadata space that will be
 needed, so it is recommended to start with a size of 1GiB which should be
 enough for all practical purposes.  A thin pool metadata LV can later be