On 18/05/2021 2:05 am, Kirk Wolf wrote:
Sorry, I meant to add that agree with David. If you have big Java
apps that use significant CPU, you really need to run them on zIIP or
the costs will be intolerable.
In the particular case of the large Australian customer, I wonder why
they didn't see the issue coming early on?
Good question. It's my understanding that they did indeed plan for
growth but the workload surpassed capacity planning. The application was
a customer facing mobile application and mobile workloads have shocked a
lot of mainframe customers over the last decade.
There is a ratio of the maximum number of zIIPs tied to the number of
GCPs. This used to be 1:1 but I believe it is now 2:1. IIRC, they also
added a caching layer to optimize the application.
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