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I just spent a bit of time trying to figure out what Multipath I/O
support was because there was no 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
--- Thu Nov 8 10:36:57 2001
+++ Thu Nov 8 12:17:36 2001
@@ -1795,6 +1795,16 @@

If unsure, say Y.

+Multipath I/O support
+ 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
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