Re: Mount by WWN (FC, using qlogic 2200)

[James Bottomley <James.Bottomley@steeleye.com>]

On Thu, 2004-02-05 at 08:56, Tom Coughlan wrote:
> Each identifier on the SPC-3 Device Identification VPD page (page 83)
> has an "association" field, with one of the following values:
> 
> - The IDENTIFIER field is associated with the addressed logical unit. 
> - The IDENTIFIER field is associated with the SCSI target port that
> received the request. 
> - The IDENTIFIER field is associated with the SCSI target device that
> contains the addressed logical unit. 
> 
> So, an identifier on page 83 may be either an LU WWN, WWPN, or a WWNN. 

Actually, this isn't an either/or, the page may contain a list. 
However, the standard is very clear (7.6.4.11.3) that each LUN that is
not a well known LUN shall have at least one identifier of association 0
(Logical Unit Identifier).

> We need to check the association field, and use the identifier
> appropriately, and we need to insist that storage vendors implement it
> correctly.

I agree, but I see this as a userspace issue.

James