I have a Windows 2008 server running Backup Exec. And it is successfully backing up to a spanned disk which is 6 TB composed of 8 smaller volumes shared through iSCSI. What makes me nervous is that windows doesn't report the size or disk usage in properties for the volume. And I can't access the volume through Explorer. But Backup Exec seems to be happy with it. And it is showing as a healthy volume in disk manager.
Disk manager can report the free and used space. So... What is a poor boy to think?