fstrim: add hint to man page

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/sys-utils/fstrim.8 b/sys-utils/fstrim.8
index 8f68351b158b36c06ec35c00091a86576ee19e4e..ae331e310ee237f7768406150ce91ff3a50c5418 100644 (file)
--- a/sys-utils/fstrim.8
+++ b/sys-utils/fstrim.8
@@ -29,6 +29,15 @@ The
 .I mountpoint
 argument is the pathname of the directory where the filesystem
 is mounted.
+.PP
+Running
+.B fstrim
+more frequently or even using
+.B mount -o discard
+might affect lifetime of the poor quality SSD devices. The usual sufficient
+frequency is once a week for most desktop and server systems. Note that not all
+devices support queued trim, so each trim command incur a performance penalty
+to whatever else might be trying to use the disk at the time.
 
 .SH OPTIONS
 The \fIoffset\fR, \fIlength\fR, and \fIminimum-free-extent\fR arguments may be