FastTrak TX2000™ Series User Manual
48
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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