-udid <Udid_Val> Specifies the user defined identifier for VVs for OpenVMS hosts. Udid value should be between 0 to 65535 and can be identical for several VVs.
To migrate the VMS existing LUNS to new LUNS the UDID can not match. However once migrated we need to change the udid to match that of the migrated LUN.
When creating a VV from the CLI we can give the LUN a number that sets LUNID, BSID and UDID to be the same. However when we change the udid (setvv -udid "some number" "vv name") it doesn't change the LUNID or the BSID.
This method works for migrations but I was looking for a command to change all ID to match for consistancy.
I found the only way to achive this is by cloning the migrated LUN and giving the clone the ID needed. Mapping it to the host and the host removing the old lun.
Both methods work, cloning is a few extra steps but cleaner and consistant.