The diagnostic utility vxdmpinq has been renamed to vxscsiinq as it is related to sending SCSI commands  and operate on any device and are not DMP specific.

The commands vxdmpinq and vxscsiinq can be used to directly query the disk array LUN information.

These are examples of their use.

Prior to Storage Foundation, 5.1 this command issued.

# /usr/lib/vxvm/diag.d/vxdmpinq EMC_CLARiiON0_0

Inquiry for/dev/vx/rdmp/EMC_CLARiiON0_0, evpd 0x0, page code0x0
       Vendorid                        :DGC
       Productid                      : RAID5
       Revision                        : 0219
       SerialNumber                    :5E0000D6BBCL

From 5.1, this command is used.

#/usr/lib/vxvm/diag.d/vxscsiinq hds9500-alua0_96
 

Inquiry for/dev/vx/rdmp/hds9500-alua0_96, evpd 0x0, page code 0x0

       Vendorid                        :HITACHI

       Productid                      : DF600F

       Revision                        : 0000

                   SerialNumber                    :D60001D30060

The most important part of that output is the LUN SerialNumber which disk array manufacturers guarantee to be unique. The commands vxdmpinq and vxscsiinq can be used to find out if Volume Manager is discovering the same LUN more than once or if different servers are discovering the same LUN.