Thanks Alan. So is SET IOCDS_ACTIVE the command that initiates the compare and redefinition of what CP sees for I/O on the running z/VM system?
-Mike -----Original Message----- From: The IBM z/VM Operating System [mailto:IBMVM@LISTSERV.UARK.EDU] On Behalf Of Alan Altmark Sent: Tuesday, June 07, 2011 12:18 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: Dynamic Activation of New IODF On Tue, 7 Jun 2011 11:14:44 -0400, Michael Coffin <michaelcof...@mccci.com> wrote: > Is it even possible to store a new IOCDS, mark it >as active for the next POR AND have CP add/change/delete IO definitions by >comparing the prior IOCDS with the newly activated one? Yes, that's precisely what HCD does. HCD will compare the new I/O configuration and the current I/O configuration, and will dynamically update the current I/O configuration to match the new one. As it does that, each LPAR whose OS is enabled for dynamic I/O will receive notification of any updated I/O componentry. In CP's case, that means bringing paths and devices online (subject to SYSTEM CONFIG and prior VARY commands). Unlike HCD on z/VM, HCD on z/OS knows how to do everything for all devices used by all operating systems. This is why when VM and MVS are on the same box, you let HCD on MVS do all the heavy lifting. Alan Altmark IBM
