man lvmcache: add writecache cleaner info

diff --git a/man/lvmcache.7_main b/man/lvmcache.7_main
index 37d0e3359c6f9733871b26c1c175e83954e8de96..85d4d9e340f4df4905b9f0783f06330cf5dd4a1d 100644 (file)
--- a/man/lvmcache.7_main
+++ b/man/lvmcache.7_main
@@ -303,6 +303,16 @@ afterwards.  Some underlying devices perform better with fua, some with
 nofua.  Testing is necessary to determine which.
 Applicable only to persistent memory.
 
+.IP \[bu] 2
+cleaner = 0|1
+
+Setting cleaner=1 enables the writecache cleaner mode in which data is
+gradually flushed from the cache.  If this is done prior to detaching the
+writecache, then the splitcache command will have little or no flushing to
+perform.  If not done beforehand, the splitcache command enables the
+cleaner mode and waits for flushing to complete before detaching the
+writecache.  Adding cleaner=0 to the splitcache command will skip the
+cleaner mode, and any required flushing is performed in device suspend.
 
 .SS dm-cache with separate data and metadata LVs