Virtual Machine Stuns
VMware’s Distributed Resource Scheduler (DRS/SDRS) can move a virtual machine depending on the need and availability of resources. This will “stun” a virtual machine, which can also occur during a virtual machine backup or snapshot delete.
Here are some VMware knowledge base articles on this subject:
- Virtual machine performance degrades while a vMotion is being performed - http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2007595
- A snapshot removal can stop a virtual machine for long time - http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1002836
- Taking a snapshot with virtual machine memory renders the virtual machine to an inactive state - http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1013163
Be aware of how a virtual machine environment might result in performance degradation when vMotion events are performed, snapshots removed, and backups taken. If necessary, reserve resources for the ActiveMatrix BPM and database systems in order to improve performance.
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