FastTrak100 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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