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From kmccormick <...@git.apache.org>
Subject [GitHub] cloudstack pull request: CLOUDSTACK-8678: Reserve RAM for KVM host...
Date Wed, 02 Sep 2015 16:26:26 GMT
Github user kmccormick commented on the pull request:

    https://github.com/apache/cloudstack/pull/766#issuecomment-137155599
  
    Regarding the upgrade scenario, I believe that this would not affect any running VMs.
Can anyone confirm? Besides just running VMs, it is still a potential problem for an installation
that is already near capacity, as the upgrade would remove a little bit of capacity. For both
issues, I think a mention in the release notes would be sufficient. To keep the old behavior,
admins just need to add host.reserved.ram.mb=0 to their agent.properties file.
    
    CPU I don't think is an issue, as memory is typically the limiting factor in virtualization.
If the CPU gets overly taxed, things slow down, where if all the memory gets used up, VMs
or other processes get killed.


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