Vault drives do not use Hot Spare unless you have created a Pool using the vault disks. If you do not use the Vault drives for user data (not configured in a Pool), then there is no Hot Spare requirement. When a Vault Drive fails, you just replace the drive (Vault drives can only be physically in the first four slots).  glen
When i'm configuring a new Unity with the "Unity Sizer", the tool ask me for add hot spares, but never takes in count the vault drives as disks that need a hot spare. For example, i can configure a pool with SAS 1,2 TB disks, and vault drives with SAS 600 GB disks, and never asks for spares to support the vault drives. It is necessary add manually spare disks for the vault drives or these disks doesn't need a spare disk?  Thanks in advance.
Unity Spare Drives