User manual

Fast Trak TX2200 / TX4200 User Manual

Mirror (RAID 1)

Writes duplicate data on to a pair of drives while reads are performed in parallel.

RAID 1 is fault tolerant because each drive of a mirrored pair is installed on

separate channels. If one of the mirrored drives suffers a mechanical failure or

does not respond to the controller, the remaining drive will continue to function.

Or, if one drive has a physical sector error, the mirrored drive will continue to

function.

On the next reboot, the FastBuild™ Utility will display an error in the logical disk

and recommend replacing the failed drive. You can continue using your PC,

however Promise recommends replacing the failed drive as soon as possible.

Due to redundancy, the drive capacity of the logical disk is half the total drive

capacity. For example, two 100 GB drives that have a combined capacity of 200

GB would have 100 GB of usable storage. With drives of different capacities,

there may be unused capacity on the larger drive.

RAID 1 logical disks on FastTrak consist of two disk drives only.

Hot Spare Drive – For a RAID 1 logical disk, you can attach a third disk drive to

the FastTrak card without assigning it to the logical disk. FastTrak will activate the

drive and use it to replace a failed drive that was part of the mirrored logical disk.

A rebuild operation copies the good drive data to the spare automatically and in

the background.

At a later time, power off the system and replace the failed drive. Spare drives

must be the same or larger capacity than the smallest logical disk member.

For more information on how to set up a hot spare drive, see page 33.

Disk Drives

Data Mirror