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[dm-devel] EMC Clariion ghost devices

	I've just tried using the multipath-tools (SLES9 SP2,
multipath-tools-0.4.4-0.22) with my EMC clariion.  Now, this clariion is
an active/passive system, and the second path is showing a ghost LUN 0
(this is expected).
	During normal boot, the device (/dev/sdap) returns an I/O error
when the kernel tries to get the partition table.  No problem.  If later
someone scans the disk, they get an I/O error.  No problem.
	Then I fire up multipathd and multipath.  Multipath creates a dm
device for the ghost, and tries to run kpartx on it.  That kpartx hangs.
In fact, I don't know how, but it ends up in a frozen I/O state.  It's
unkillable.  I'd expect an I/O error, but no, it just plain doesn't
exit.  Ditto any other access to the associated dm.
	Now, is this a dm problem (the device not seeing the error and
returning it)?  Is it a multipath problem (multipath should notice the
ghost and not try to dm it)?  Is it a configuration problem (I should
somehow know which name the ghost got, and configure multipath to ignore



Life's Little Instruction Book #182

	"Be romantic."

Joel Becker
Senior Member of Technical Staff
E-mail: joel becker oracle com
Phone: (650) 506-8127

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