RHEL5 Xen Guests Blocked After SAN Upgrade

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Issue

Xen Guests Blocked After SAN Upgrade
Powered off all systems, virtual and hosts, in order to update SAN. Updated the SAN, powered up the hosts without issue, but the virtual guests won't start. They show a status of 'blocked'. Multipath -ll shows all the LUNs presented, active and ready on the hosts.

Environment

Red Hat Enterprise Linux 5
Multipath SAN
Virsch Xen

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