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Bug 974888 - Why virtual guest is migrated when the virtual host move to maintenance mode ?
Why virtual guest is migrated when the virtual host move to maintenance mode ?
Product: Red Hat Enterprise Virtualization Manager
Classification: Red Hat
Component: Documentation (Show other bugs)
x86_64 Unspecified
unspecified Severity unspecified
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Assigned To: Tim Hildred
Depends On:
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Reported: 2013-06-16 23:18 EDT by Yoshinori Takahashi
Modified: 2015-09-22 09 EDT (History)
4 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2013-06-17 21:47:30 EDT
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Comment 1 Tim Hildred 2013-06-17 21:47:30 EDT
Hello Yoshinori-san,

From my understanding, virtual machines have to migrate from a host in maintenance mode, even though you've selected "do not migrate" as your policy.

The alternative is just having running virtual machines die, or not being able to put into maintenance mode any hosts in a cluster with "do not migrate" policy set. When a host unexpectedly shuts down, virtual machines are again on another host depending on your policy. 

"Do not migrate" means that virtual machine will not migrate in case of excessive load on a specific host. 

For a virtual machine to not migrate at all, you want to pin it to a host CPU. That means it needs a specific CPU and will not start on a different host if the host it is pinned to dies unexpectedly. 

Check out "CPU Pinning Topology" in this section:

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