Promise Technology FAST TRAK100TM User Manual
Page 74
FastTrak100 User Manual
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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.