Promise Technology FastTrak TX4000 - Manual (Page 23)

Chapter 3: FastBuild Configuration Utility
19
Using a Hot Spare Drive
If a third drive is attached and is not assigned to a mirrored two-drive disk array
(one optimized for Security), it will be recognized as a spare drive. Such a drive
is immediately used as a standby replacement. It is automatically added to an
array once a disk member of the array has been detected as failed.
To restore fault tolerance as quickly as possible, FastTrak TX4000 begins to
perform an automatic data rebuild on the spare drive in the background without
the need to restart the system.
At a later time, the failed drive can be physically removed from the FastTrak
TX4000 card and an extra drive added in its place to function as the spare drive.
Important
The hot spare drive must have a capacity that is equal to or
larger than the smallest array member.
Creating Multiple Disk Arrays
If you plan to create multiple arrays,
1. Attach only the drives necessary to create the first disk array and complete
the Auto Setup (1).
2. Install the additional drives needed for the second array and again use the
Auto Setup (1).
Note
If you wish to customize the settings of individual disk
arrays (such as block size), you must manually create disk
arrays with the Define Array (3) option from the Main Menu.