I came across this today and it took me quite a while to figure out what happened. I migrated a vSphere 5 environment from vNetwork Standard Switch to vNetwork Distributed Switch. Afterwards I deleted all old Standard Switches, but I had two Portgroups in Home->Inventory->Networking with Virtual Machines connected to them. Strange, as the vSwitches were gone.
After checking logs and playing around I found that these VMs had a snapshot. After deleting the snapshots the orphaned Port Groups disappeared, so I can now head off to HP Discover in Vienna.
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Orphaned Port Groups after migrating to distributed vSwitch
Montag, 28. November 2011Does your ESX Server really get its time via NTP?
Montag, 15. Februar 2010If you want to check NTP on your ESX host, don’t rely on vSphere Client! Even if it looks okay it might not be working.