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Subject: [dm-devel] multipath-tools/multipath multipath.8
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--- multipath-tools/multipath/multipath.8	2006/11/30 23:25:13	1.9
+++ multipath-tools/multipath/multipath.8	2009/11/24 22:12:35	1.9.2.1
@@ -75,6 +75,10 @@
 is in the /dev/sdb (as shown by udev in the $DEVNAME variable) or major:minor format.
 .I device
 may alternatively be a multipath mapname
+.SH NOTES
+a map may be unused if, eg, the file system on it is not mounted or
+there are no open file descriptors against the device file, as in a
+raw device.
 .SH "SEE ALSO"
 .BR udev (8),
 .BR dmsetup (8)