Does an HMC reboot require downtime?
AnthonyEnglish 270000RKFN Comments (4) Visits (8819)
A client asked: "Do I need downtime to reboot the HMC?"
Short answer: No (but good luck finding that short answer)
Finding that answer (with --verbose enabled):
Of course, a reboot of the HMC involves downtime of the HMC itself, but what about the logical partitions (LPARs) and the IBM Power Systems they belong to?
First, let's check the official documentation. The Hardware Management Console V7 Handbook has a section on HMC Shut Down or Restart:
This has explained how to shut down (and restart) the HMC, but what we don't know is what the impact might be to the Managed Systems and their LPARs.
The IBM Systems Hardware info
However, we happen to find this little snippet in the section of the HMC V7 Handbook on upgrading the HMC's firmware:
Well, any HMC-specific activities will be interrupted by a reboot of the HMC. So that would include
So, what turned out to be a simple, and very common question: "what's the business impact of an HMC reboot?" is not such a simple one to find the answer to. Of course, like all things, it's easy if you've done it before.