On Thursday, 07/21/2011 at 03:32 EDT, Sherry Everhart <severh...@maccnet.com> wrote: > I am interested in knowing how to configure a "spare" ESCON channel to our > DASD so that if one of the existing eight shared channels goes belly-up > (like it did last week) we can just move the cable over and not have to > POR. > > I'm currently looking in the "System z Input/Output Configuration Program > User's Guide for ICP IOCP" but I'm not sure what to look for.
IOCP is complaining because you are trying to assign more than 8 paths to a Control Unit. (See Machine Limits appendix.) The service rep will use PCHID/CHPID reassignment on the SE to logically move the CHPID associated with the failing port (PCHID) to a good port on the *same card*. Check out the IBM System z Connectivity Handbook (redbook). It has an extensive discussion on ESCON channel sparing. Alan Altmark Senior Managing z/VM and Linux Consultant IBM System Lab Services and Training ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott
