Ray, You mention number of usable NPIV subchannels are subject to the switch limitations.
Are switch limitations what the IBM Redbook is referencing when it says don't "use more than 32 subchannels per physical channel in NPIV mode"? With the Brocade switch I could use 255 subchannels in NPIV mode? (see "Introducing N_Port Identifier Virtualization for IBM System z9" page 4 http://www.redbooks.ibm.com/redpapers/pdfs/redp4125.pdf ) " Configuration considerations Some general recommendations for using NPIV include: Do not use more than 32 subchannels per physical channel in NPIV mode. Also, do not perform more than 128 total target logins (for example, in a configuration with 32 subchannels, limit the number of target logins to no more than an average of 4). Using more subchannels, target logins, or both can create timeouts." -------------------------------------------------------- This e-mail, including any attachments, may be confidential, privileged or otherwise legally protected. It is intended only for the addressee. If you received this e-mail in error or from someone who was not authorized to send it to you, do not disseminate, copy or otherwise use this e-mail or its attachments. Please notify the sender immediately by reply e-mail and delete the e-mail from your system. ________________________________________ From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Raymond Higgs Sent: Saturday, December 08, 2007 2:01 PM To: [email protected] Subject: Re: SAN and Linux on zSeries <snip> Not all 480 subchannels can be used with NPIV because of switch limitations. The 480 number was chosen arbitrarily from the layout of the SIGA vector long before NPIV was implemented. I think Brocade supports the most virtual nports per physical port, 255. Ray Higgs System z FCP Development Bld. 706, B24 2455 South Road Poughkeepsie, NY 12601 (845) 435-8666, T/L 295-8666 [EMAIL PROTECTED]
