What is the VDID

VOM uses the VDID obtained from VxVM to identify the array as so has identifed an Hitachi USP-V (actually the USP is rebadged as StorageTek 9990V) as:

HITACHI_R600_SerialNo

This is not useful as I don't know what R600 means, so I am trying to understand what the VDID is.  I have looked in:

SF admin
VOM users
VOM Install
VOM Add-ons User

But I can't find any definitions in these.

I could only find an old VOM windows guide reference to it - http://sfdoccentral.symantec.com/vom/4.0/win_unix/html/vom_winadm_addon_users/SFW_VOM40/ch04s03s13.htm

which says:

The Veritas Disk ID (VDID) is a string that contains information that can identify the array that a disk is contained in. The VDID string is shown in the GUI as a part of the display of information for disks. The VDID string is also shown as a result of the vxdisk diskinfo and the vxdisk list CLI commands.

The format of the VDID string varies by array manufacturer and array model. The details of how to interpret the VDID string for a particular array are in an appendix.

and the next page gives a table for format of VDID Strings for Various Arrays including

Hitachi    9960, 9970, 9980, 9200, 9500,7700,USP    HITACHI_{Model}_{EnclosureID}_{CU}_{ LogicalDeviceID }
Hitachi    other models                                        WWWN+LUNID

vxdisk list does not give VDID (and vxdisk diskinfo is Windows syntax), but I can get VDID from vxlist which shows:

Enclosure:  hitachi_usp-v0
Status:             connected
Model:              HITACHI
Revision:           6008
Array Type:         A/A
Serial Number:      SerialNo
ASL:                name=libvxhdsusp.so version=vm-6.1-rev-1
I/O Policy:         default=MinimumQ current=MinimumQ
Partition Size:     default=512 current=512
Recovery Option:    Throttle cur=Nothrottle[0] def=Nothrottle[0] Error-Retry  cur=Timebound[300] def=Timebound[300]
Failover Policy:    default=Global current=Global
Redundancy:         default=0 current=0
Disk Count:         241
Path Count:         482
VDID:               HITACHI_R600_SerialNo
Target Ports:       5,5,6,6

As I understand, in vxdmpadm, the enclosure name is the enclosure type appended with a number (0, 1, 2 etc) so the enclosue is unqiue within the host, but not between hosts, so I understand the need to a unique identifier, but it would seem sensible to just append the serial number to the enclosure name.

So where can I find a recent definition for VDID on UNIX so I can find out what R600 means - perhaps this is the Enclosure_id - are there any vxvm commands I can run to obtain Enclosure_id

Thanks

Mike