You can use Live Partition Mobility to move a running partition between systems to remove outages caused by planned hardware (compute or storage) maintenance. But if you need an OS upgrade/PTFs etc, the OS must be restarted. You know the frequency of those outages in your environment better than I do. For those outages, you can use PowerHA to reduce the downtime (my customer experiences is 15-20 minutes for a switch) but it won't zero the outage needed to move the disk assignment. For failures, PowerHA and/or HMC Remote restart can be used to automate recovery for less hands on.
Patrick Bingham | Principal, Converged Infrastructure Architect
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From: Graap, Kenneth [mailto:Kenneth.Graap-EwKdArkbKgQSfirstname.lastname@example.org]
Sent: Tuesday, October 21, 2014 10:09 AM
To: Midrange Systems Technical Discussion (midrange-l-Zwy7GipZuJhWk0Htik3Jemail@example.com)
Subject: PowerHA for IBMi
I would be interested to know if anyone is using PowerHA for IBMi along with Live Partition Mobility.
Specifically how one might use these processes to perform monthly maintenance, such as loading a Technology Refresh, without interrupting service to Telnet users.
My "incomplete" understanding of these processes seems to indicate that if I want to do an IPL to apply PTF's followed by running a SAVSYS backup, I'd still have to take the system from my telnet connected application users. Is this true? If so, how can I ever have a truly 7x24 IBMi environment?
Also, using PowerHA, External Disk (V840 SAN), and VIOS, how could I automatically SWAP to my HA system in the event I lose my primary system unexpectedly (i.e. power outage or system crash)?
Kenneth E. Graap
System Administrator for IBM Power Systems
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