for me moving from 2.3 to 2.4, (I waiting some time to upgrade to Z22
mode) , I have to enlarge my CKPT datasets then $ACTIVATE,LEVEL=Z22
you can $DACTIVATE to check if your current CKPT's meet the requirements.
I performed the CKPT change using the checkpoint dialog to move to
newckpt1 and 2 (larger than ckpt1 and 2) , deleted old ckpt1 and 2 and
reallocated 1 and 2 larger and then used the dialog to get me back to
ckpt1 and 2
I cannot recall the last time a cold start being required, I've done
cold starts after offloading and reloading spool migrating to new DASD
perhaps before the migrate facility was available in JES2
Carmen
On 8/19/2022 1:59 PM, Marna WALLE wrote:
Hello,
A couple of questions I had in email, which I hope will help here:
I was asked about if a COLD START was required in z/OS V2.5: There is NO COLD
START required for z/OS V2.5. I haven’t seen a required COLD start, in like
forever, and I can’t recall that we have needed it during my whole career, at
least while working on z/OS migrations. I'm sure folks here go back further
than I do, and probably will take up a thread on this :).
What is really required on z/OS V2.5: Carefully read the z/OS V2.5 Upgrade
Workflow (which was linked in a prior append), it says that z22 is required,
but it should be done while still on your V2.3/V2.4 system. On those systems,
you can fallback to z11 if you must while on z/OS V2.3/V2.4, but you have to be
at z22 on those systems *before* you introduce V2.5.
There was a defect in this area, but it didn't affect the z22 upgrade requirement. The APAR mentioned in a prior post was the one I was thinking of. I have not been aware of this z22 requirement being debated or possibly not happening in z/OS V2.5. I knew it was happening for quite a while, and it was in the z/OS V2.5 Upgrade Workflow even in the first version of it. And nicely, we've had a Health Check to do that encouragement for a long time now.
I do know that z11 hasn’t been scrubbed from the z/OS V2.5 books – I’m not sure exactly why, so it may not be worth reading too much into it. Maybe it was an oversight or maybe it was intentional so that folks looking at V2.5 manuals while on V2.3/V2.4 still get the z11 updated information, since we don't update the V2.3/V2.4 books anymore. That’s something to do a Feedback on so it can get to the right manual writer for attention. They are pretty good about following up with Feedback from IBM Documentation, so it would be worth the comment, please.
So let’s recap: with z/OS V2.5, z22 is absolutely required with no COLD start. Use the health check to get the a-ok before going to V2.5.
Hope to see many of you at SHARE next week!
-Marna WALLE
z/OS Installation and Upgrade
IBM Poughkeepsie
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