Unsure how you got to this disk configuration (1TB + 100GB), but that is not how it is supposed to be. During installation, a 30GB or 40GB disk should come with the VM image import. Then you add the second disk depending on the appliance size, for the C2000V that should be 1000GB. So for the C2000V you should have a 30GB or 40GB disk as first HDD and a 1000GB as second HDD.
As you disk setup is quite different, I would either work with Aruba TAC to get this setup right or the faster alternative is to create a backup, spin up a new appliance with the correct disk setup and specs and restore the backup (then rejoin AD, reinstall certificates).