
FastTrak TX4310 User Manual
100
About Dual Data Redundancy
One unique (though rarely occurring) feature of RAID 10 is dual fault tolerance. In
some cases, two drives can fail simultaneously and still maintain the integrity of
data. There are six combinations in which two drives can fail. The FastTrak
TX4310 protects your data array in four of those cases. Assume the drives are
configured as follows:
•
CH indicates channels on the FastTrak Controller card.
•
A/B indicates which striped pair the drive belongs to.
•
1/2 indicates which part of stripe data.
Under RAID 10, the array maintains data integrity if any 1, 2 combination
survives.
CH1
CH2
CH3
CH4
Drive A1
Drive A2
Drive B1
Drive B2
Event
Failed
Drives
Logical Drive
Status
Why?
1
A1/A2
Functional
B1/B2 retain integrity
2
B1/B2
Functional
A1/A2 retain integrity
3
A1/B2
Functional
B1/A2 retain integrity
4
B1/A2
Functional
A1/B2 retain integrity
5
A1/B1
Offline
B2/A2 contain only half the data
6
B2/A2
Offline
A1/B1 contain only half the data
Summary of Contents for FastTrak TX4310
Page 1: ...FASTTRAK TX4310 USER MANUAL Version 1 1 ...
Page 4: ...FastTrak TX4310 User Manual iv ...
Page 14: ...FastTrak TX4310 User Manual 6 ...
Page 30: ...FastTrak TX4310 User Manual 22 ...
Page 50: ...FastTrak TX4310 User Manual 42 ...
Page 102: ...FastTrak TX4310 User Manual 94 ...
Page 116: ...FastTrak TX4310 User Manual 108 ...