Hello All,
We have built another VMware environment with a SAN and 4 host. It's an iSCSI SAN. The old infrastructure has also 4 hosts with a iSCSI SAN. The iSCSI SANs don't see each other. To move VMs I have to shut them down an migrate. This is an easy tasks for each VM when the VM is not a Vcenter Server. 
Well to move the Vcenter Server I thought to restore the VM using Backup Exec and restore to the new environment, but leave it turned off until I have shut down the old Vcenter VM. After I shut down the Vcenter server I logged in to the host with the restored Vcenter Server using the Windows Vsphere client and powered it on. Actually my plan worked and I could log in after a few minutes with the web client. All looked great except one ESXi host was shown disconnected. It was the ESXi host to which I restored the Vcenter VM.
After a few attempt to reconnect the host to Vcenter using the webclient I discovered that I was unable to ping the ESXi host inside the restored Vcenter server. This explains why I couldn't reconnect the host because the restore Vcenter server was unable to locate it on the network. However from my management computer I was able to ping the ESXi host. What puzzled me that even inside the restored Vcenter Server I could ping any other server server in my LAN which indicates that the restore Vcenter server has connectivity to the LAN.
Any hint what went wrong after my Vcenter was restored from the backup?
Thanks,
Edy