Hello together,
i have a big problem with my migration function on our ESX 5.1 Cluster. We have two ESX-Hosts which are connected by iSCSI and using two SAN. Also there are two switches, so we have an redundancy on all parts of the cluster. The virtual machines working on the esxhost-A and have their vmdk and so on stored on the SAN-A. A replication makes different replications to the second host (esxhost-B). Now i had to increase the RAM in both of the esx host without have a downtime. My idea was to shut down esxhost-B at first (there are no virtual machines working) and increase the RAM. Than start esxhost-B and migrate all machines from esxhost-A to esxhost-B. All works fine and fast. After that i increased the RAM in esxhost-A and started it up. Now i wanted to migrate all the machines back to esxhost-A. And this doesnt work 
If i try to migrate a machine back to esxhost-A there pop up an error after 65% of migration:
I cant increase the switchover time because i have to shut down the VMs and for that and thats no possibility for me.
Can anybody help me out?
Sincerely,
Thomas G.