Some VM's drop many pings after a vmotion

[tekhie999]

HI all

I have 22 VM's on a host and if i vmotion, some vm's drop no pings, some drop 1 ping (normal beahviour in my opinion) however some VM's drop up to 60 pings.

If i set a continuous ping from within each GuestOS to an admin server elsewhere on the network and repeat the vmotion, 1 ping maximum is dropped for all vm's.

It looks like the VMs are sending the switch ports a fake frame to let the switch know they have moved so no issue there, but why some respond straight away, and others take a long time, unless pinging from within the GuestOS to the network, in which case no issue for any of the vm's?

Anyone encountered this issue before ?

thanks

[a_p_]

Strange.

Have you verified that none of the physical switch ports has spanning tree enabled, and that there are no ARP cache related issues on the physical switches?

Can you - for troubleshooting purposes - run a continuous ping to the VMs that you vMotion from a VM that's already running on the target host.

André