Our controllers are clustered and we only have one inital igroup for for both of our ESX's called VMware that is mapped. Also the two viaRPC connections made by snapdrive for the two LUNs of the exchange server are not mapped to any visible LUN. I hope they figure out why SMVI does that. Thanks for response.
SMVI does not clean up an existing igroup when a LUN is unmounted and reuse it for future mounts.If there are no mounted backups and there are no VMFS-based virtual machine restore processes running, you can manually delete the igroup.