Just a quick note here for people using VCBMounter / VCB: VCB does NOT support existing snapshots. We noticed a delay of 5 minutes during the (manual) execution of the VCBMounter command initialization & the actual snapshot failure. This results in a disconnected ESX host in VirtualCenter (30 seconds disconnect). This also means that the snapshot backup didn’t work.
You actually lose some functionality (namely: creating snapshots before an upgrade/service pack & testing it for a number of days before committing the snapshot). Something for VCB 2.0 maybe?