All, I need to have a short outage for all POWER9 virtual machines running on our cluster. I've been doing kernel upgrades on the hypervisors and I ran into an interesting problem on the POWER9 machines.
For whatever reason, I'm not able to complete a live migration between a POWER9 hypervisor running the 4.14 kernel onto a machine which has the newer 4.19 kernel. I've confirmed that once the a VM has been moved to a machine running the newer kernel, live migrations work between nodes running the newer kernel. I did not run into this problem with the POWER8 nodes. My plan is to issue a "migrate" command for each POWER9 VM running at 9AM PDT (1600 UTC) which will gracefully shutdown the VM and power it up on another server. I expect the outage should last no more than a few minutes per VM. If this is a problem for your project, please let me know ASAP. Thanks- -- Lance Albertson Director Oregon State University | Open Source Lab
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