User`s manual

FastTrak100 TX/LP™ Series User Manual

Under RAID 0+1, the array maintains data integrity if any 1, 2 combination survives.

Event Failed Drives Array Status Why?

1 A1/A2 Working B1/B2 retain array integrity

2 B2/B1 Working A1/A2 retain array integrity

3 A1/B2 Working B1/A2 retain array integrity

4 B1/A2 Working A1/B2 retain array integrity

5 A1/B1 Offline B2/A2 contain only half of array

data

6 B2/A2 Offline A1/B1 contain only half of array

data

Spanning (JBOD)

A Spanning disk array (also aptly named as JBOD for “Just a Bunch of Drives”) is

equal to the sum of all drives when the drives used are of different capacities.

Spanning stores data on to a drive until it is full, then proceeds to store files onto the

next drive in the array. There are no additional performance or fault tolerance array

features in this array. When any disk member fails, the failure affects the entire array.