This value, most generally, is derived from a WWID of some kind especially for LUNs from SAN, or VSCSI. There is a second attribute "unique_id" that may also be used. The primary means to identify a disk (volume) is to use the PVID - which is an ID that AIX assigns when the disk (aka volume) is first assigned to a volume group. * A related question (that you did not pose) is how does AIX keep track of a disk - is it new, or just moved within the system? ** So, who is responsible? The device driver would be my simple answer. On Linux, the device used as the server host ID must reside on eth0. Volume Serial Number Changer v.1. What I also recall is when VPD status is changed (e.g., a new disk drive firmware) the VPD is updated. You cannot use a volume serial number as the host ID for a Windows license server. * The VPD (or ODM file CuVPD (for Cu(rrent) VPD is primarily, perhaps solely, as a way to determine the firmware of a device without actually querying the device. * What I recall is that VPD is provided by the device (driver) via queries - as agent.kgb suggested.
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