This patch adds the most basic dm-multipath hardware support for the
HP active/passive arrays.
Signed-off-by: NDave Wysochanski <dwysocha@redhat.com>
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Acked-by: NChandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>