Some common configuration errors can lead to a virtual machine becoming unresponsive, such as while waiting for a resource. Review the virtual machine and host configuration. For more information, see:
Thank you for the feedback. Unfortunately none of the conditions listed in the articles exist in my configuration. The articles only mention the VM performance being affected, not the entire host. When I have a snapshot on a vm the entire host becomes unresponsive for 1-2 seconds at a time, every few seconds, as long as that vm is active. I can have only 2 vms running, 1 with a snapshot, and it tanks the host responsiveness both in the web interface and ssh keystrokes. As soon as I delete the snapshot everything is fine.
Performance is still terrible across the entire host when a single vm has a snapshot with the ESXi 6.5 dec updates, guests running 10.13.3. A 600mb file copy from one folder on the desktop to another in a different VM takes 5 minutes with long periods of no progress.
How many snapshots are we talking about? Having too many snapshots will have a performance impact.
May be you can try the following:
1. Shutdown the problematic VM.
2. Create another VM with a single snapshot and run your tests (Read/write to disk, VM power on etc). If you are seeing a better performance, may be you can consolidate the snapshots.
3. Also have you gone through the performance charts, Disk, CPU, Memory etc?