Thanks Jim - it is always good to get an answer from an expert. > On 24 Oct 2023, at 20:43, Jim Mulder <[email protected]> wrote: > > The Validated Boot enhancements to z/OS made a change to a channel program > that we > use to build the nucleus. The changed channel program is used regardless of > whether you are doing > a validated boot or not. z/VM minidisk caching screws up while emulating the > channel program. Last > I talked to the z/VM developers, they still had not figured out what the bug > is. As long as minidisk caching (MDC) > is turned off for at least the z/OS IPL device minidisk, the channel program > will be executed by the I/O subsystem, > which executes it correctly. The problem only occurs when you are IPLing > z/OS from a minidisk to which you > have LINKed (or is in your VM directory), with MDC enabled for that minidisk. > If you instead ATTACH the device to > the VM user, the problem will also not occur, since it is not being treated > as a minidisk in that case. > The type of processor or DASD controller is not relevant to the problem. > > Jim Mulder > > > >> To: [email protected] <[email protected]> >> Subject: Heads up: z/os 3.1 WAIT 006 under z/VM + DS6800 question >> >> For my first z/OS 3.1 IPL (under z/VM) I got WAIT 006. After a long search I >> found z/VM APAR VM66721: Z/OS GUEST IPLS FAIL AFTER APPLYING >> UJ92591/UJ92728. There is no PTF as
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