Promise Technology FastTrak TX2000 User Manual download pdf (Page 52)

FastTrak TX2000™ 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.

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Promise Technology FastTrak TX2000 User Manual Page 52