For some time I have maintained a document that details how to determine a WWPN for most common examples of Fibre Channel storage sold by IBM. This document is really useful when you're staring at a WWPN being reported by a Fibre Channel switch or device and you're trying to work out which port on your IBM Storage it comes from. It's great for when you're performing zoning, creating a build document or setting up mirroring between .
Version 6.4 is now online and can be found here:
You can also find and download it from :
One of the changes referenced in the new WWPN determination document is a corner case you might encounter if setting up mirroring from a or to a new DS8800, but only where the DS8800 has 8 port host adapters and where the mirroring is to the lower ports of that adapter. If I have lost you already, then the following document will not interest you. However if you need to configure such an environment, check out my document detailing a variation in the way the adapter ID is reported, which you can find here.