[T10] EUI-48s & the Software Interface Identification VPD page

Ralph Weber Ralph.Weber at wdc.com
Sun Oct 11 10:00:51 PDT 2020


In keeping with its original specification in T10/02-075r1 (see https://www.t10.org/cgi-bin/ac.pl?t=d&f=02-075r1.pdf), the Software Interface Identification VPD page uses EUI-48s to indicate available software interfaces.

The proposal author's justification for this reads as follows...
Considerable utility may be made of the processor model's generic SEND and RECEIVE command set were it possible to identify the message set of a device by other than vendor specific means. A software interface identifier already in widespread use, the IEEE EUI-48, could enable a standard method to discover message set support in a processor device.

One very well known use of EUI-48s is as Ethernet MAC Addresses, a situation which places the EUI-48 directly in the crosshairs of the recent IEEE changes in OUI definitions and uses.

Consider now the SPC-6 definition of the Software Interface Identification VPD page...

  *   should the definition continue to be restricted to using EUI-48s (which may severely restrict a developer's ability to obtain workable values from the IEEE),
or
  *   should the SPC-6 proposal that switches away from using OUIs (aka IEEE company identifiers) make changes in the VPD page definition that allow the use of either EUI-48s or ELI-48s (the latter numbers being much easier to obtain from the IEEE)?

Curious in Dallas.

All the best, .Ralph



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