PROBLEM
Snapshots in a VMware virtual environment can have a significant impact on server performance. Therefore we recommend that VMware snapshot best practices are followed as detailed in the VMware knowledge base article https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1025279
Please refer to the System Engineering Guide for your version of MiContact Center Business for information on compatible versions.SYMPTOMS
Unexplained performance degradation with no obvious increase in CPU or memory usage.
CAUSE
Taking a VMware snapshot results in a change log being created. By running a chain of snapshot there will be a series of change logs that can result in the virtual machine having to access multiple files for ever action. This causes a large increase in I/O operations and a degradation in performance.
RESOLUTION
If you have a chain of snapshots you must consolidate these onto the parent disk by using the delete function in snapshot manager. Deleting snapshots involves large amounts of disk reads and writes, which can reduce virtual machine performance until consolidation is complete.
APPLIES TO
MiCC 6.X or newer
Keywords: VMWare Virtual Virtualization Snapshot memory usage performance