On Tuesday, 07/08/2008 at 03:05 EDT, Brian France <[EMAIL PROTECTED]> wrote: > Thanx Alan. Looks like I need to do some reading on NPIV. By the > way, I'm pretty sure, thos you have me second guessing, that if you > have several chpds on a frame, they all have the same WWPN which > comes from the machine.
No. Without NPIV (N_Port ID Virtualization), each FCP chpid has a single unique WWPN that is shared by all subchannels on it. This means that all Linux guests sharing an FCP chpid have the same WWPN; the switches and controllers cannot tell the difference, so all guests have the same access rights. With NPIV, every FCP subchannel on the box has a unique WWPN. Therefore the fabric can differentiate among the guests, and give proper access rights. Alan Altmark z/VM Development IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
