We have a Windows 2008 VM that runs on an ESXi 3.5 server. It has two VMDKs attached to it: the boot drive and a 1TB data drive. The boot drive VMDK resides on some DAS drives on the server. The data drive sits on an iSCSI datastore.
We have been trying to migrate the VM to an ESXi 4.0 server. To save time we only converted the boot drive to the new ESXi server with the idea that we could attach the 1TB data vmdk later to the VM. The VM boots without the data vmdk attached. However, when we try booting the new VM with the data vmdk attached it POSTs but won't boot. The console shows a black screen; no Windows loading bar.
Does anyone have an idea why the VM would boot without the vmdk attached but won't boot with it attached? I really don't want to convert the VM again with the boot and data drive since it will take 7 days to complete.