Configure.help entry for CONFIG_MD_MULTIPATH

[Sven Heinicke]

I just spent a bit of time trying to figure out what Multipath I/O
support was because there was no Configure.help entry.  Here is a
slightly modified description of it from Ingo Molnar first post of the
code.  It would of saved me time if it was there.

$ diff -u Configure.copy.help Configure.help
--- Configure.copy.help	Thu Nov  8 10:36:57 2001
+++ Configure.help	Thu Nov  8 12:17:36 2001
@@ -1795,6 +1795,16 @@
 
   If unsure, say Y.
 
+Multipath I/O support
+CONFIG_MD_MULTIPATH
+  Multipath-IO is the ability of certain devices to address the same
+  physical disk over multiple 'IO paths'. The code ensures that such
+  paths can be defined and handled at runtime, and ensures that a
+  transparent failover to the backup path(s) happens if a IO errors
+  arrives on the primary path.
+
+  If unsure, say N.
+
 # AC tree only
 Support for IDE Raid controllers
 CONFIG_BLK_DEV_ATARAID