Morning,
Got an odd one. We have a virtual Windows vCenter Server. When we take a snapshot (with or without memory) all hosts on the vCenter briefly disconnect. This happens in the last second of snapshot creation.
The backup of the virtual server takes a snapshot during the evening so the host disconnection is triggered every evening.
The strange thing is if I take a manual snapshot I can replicate the issue. If I delete the snapshot and then create another the issue no longer occurs. It seems to only occur after a period of time.
vCenter Version 5.0.0 build 455964.
14 x ProLiant DL380 G7
2 x 8GB Fibre Channel
1GB NICS
100GB RAM
12 x 3GHz CPU
Only 83 VM's.
Any tips on how I can diagnose this?
Not sure if you resolved, but perhaps try this setting:
Sadly a different issue.
This is still happening but for now we created a rule to keep the vCenter server away from this host to prevent it from happening. Not exactly a fix but a workaround.
Only a guess. Did you already take a look at the guest's event logs? Maybe this is a VSS related issue where VMware KB: Troubleshooting Volume Shadow Copy (VSS) quiesce related issues can help!?
André
Sadly the Windows event logs show nothing other than the host disconnections event (ID 701 in the application log).
ESXHOSTNAME01: Alarm 'Host connection and power state' on ESXHOSTNAME01 changed from Green to Red
ESXHOSTNAME02: Alarm 'Host connection and power state' on ESXHOSTNAME02 changed from Green to Red
ESXHOSTNAME03: Alarm 'Host connection and power state' on ESXHOSTNAME03 changed from Green to Red
etc