LaCie Biggest Quadra | Understanding RAID |
User Manual | page 17 |
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3.2. RAID 0 + 1
High Data Transfer Performance
This level combines striping and mirroring, which provides full data redundancy and protects data in the event that multiple drives fail (provided that the data on one of each mirrored pair of drives is intact).
Storage capacity in this configuration is determined by multiplying the capacity of the smallest disk by two. If, for instance, there were four drives installed that ranged in capacity from 40GB to 70GB, as a RAID 0+1 array, the total available capacity would be 80GB (40GB x 2). In this configuration, you must have an even num- ber of disks, so in the case of the LaCie Biggest Quadra, you would need to have four hard disks installed.
■Characteristics and Advantages
❖Implemented as a mirrored array with RAID 0 arrays as the segments
❖The same fault tolerance as RAID level 5
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❖High I/O rates are achieved thanks to multiple striped segments
❖Excellent design for those seeking high perfor- mance, without achieving maximum reliability
■Recommended Uses
❖Imaging Applications
❖General Fileserver
E
D
C
B
A
| CONTROLLER |
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A | B | A | B |
C | D | C | D |
E | F | E | F |
G | H | G | H |
| R0 | R0 |
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| R1 |
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This diagram represents a RAID 0 +1 array, consisting of four disks, which are connected to the Controller. The Controller creates two matching RAID 0 arrays on the four disks.
Fig. 3.2.
