The array data struct for DGC (CLARiiON) shows that LUNZ is blacklisted; but any tine that LUN is “visible” during a reboot; the host will hang.
EMC did state this was an issue in their DM config guide; but I thought black listing would circumvent the issue.
features 1 queue_if_no_path
hardware_handler 1 emc
prio_callout /sbin/mpath_prio_emc /dev/%n