Part Three: hmc/firmware upgrades.
Basically make sure that your upgrading just keeps compatibility between your HMC and the firmware on your Power system. You do not want to upgrade one to the point where it is no longer compatible with the other. We had quite a thread on this recently.
IBM's Fix Level Recommendation Tool, or FLRT, will help you with this.
There's also a chart of compatibility between firmware and hmc code.
See the following for some nice links.
https://archive.midrange.com/midrange-l/202112/msg00408.html
Rob Berendt
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