What does 'Uptime' column in vCenter referes to?

Whuu... big customer all red flags raised. All VMs reboot during vMotion and svMotion, migration project stopped...

Virtual Machine which interest us is dc2 with uptime 10 minutes.

We choose dc2 and vMotion to second esxi host.

1..2..3 vmotion me..

After vmotion we see uptime 21 seconds !!! OMG my VM crash, rebooted ? NO ;-) Everything Okay...

The 'Uptime' column referes to the uptime of a given VM process on ESXi and it is unfortunate that it's often interpreted as guest OS uptime. The behaviour is expected since a new vmx process and associateed world ID is created for a VM on migration so logic dictates the 'Uptime' is reset during vMotion/svMotion. Let's say sometimes 'less is more' ;-)