Staller, Allan wrote:
The issue is not technical, it is a business issue.
The traditional method of z/VM maint is to bring up the new release as a
guest under the current release. Migrate all of the guests on the
current release to the new release, and shut down the "old release".
This will promote the "new release" to be the true hypervisor. This
obviates the technical necessity for multiple LPARs.
However, if that LPAR needs to be shut down for any reason (Disrputive
microcode is the only thing I can think of at the moment), you have lost
all applications. You haven't stated if there are multiple CEC's
involved or just LPARs on a single CEC.
Presumably if you're updating the slushware, you have to shut down
everything anyway, the question is whether it's all at once or staged.
Unless (and I don't know this) you can migrate the running system to
different hardware (real or virtual) without IPL. We could almost do
this in the 70s on the 3168 (one could take out half an MP, but only one
half, not one at a time).
--
Cheers
John
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