[osuosl-openpower] Planned outage for POWER9 VMs - Wednesday April 3, 2019 9:00AM PDT (1600 UTC)

[Lance Albertson]

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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