Promise Technology 150TX2 - Manual (Page 27)

Chapter 2: Getting Started
23
Using a Hot Spare Drive
Caution
With some models of hard drives, if the Master hard drive fails, it
may cause the Slave hard drive to be unrecognized by the
computer's operating system. Where a RAID 1 (Mirroring) array
exists on the Master/Slave pair, this condition may cause the
operating system to freeze.
Do NOT create a RAID 1 (Mirroring) array with two Parallel ATA
hard drives using the Master/Slave arrangement on Channel 3
(the Parallel ATA port).
You can create a RAID 1 (Mirroring) array by combining hard
drives on:
•
Channels 1 and 2 (Serial ATA only)
• Channels 1 and 3 (one Serial, one Parallel)
• Channels 2 and 3 (one Serial, one Parallel)
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 S150 TX2plus 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
S150 TX2plus 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.