On RAID 3 systems, datablocks are subdivided (striped) and written in parallel on two or more drives. An additional drive stores parity information. You need at least 3 disks for a RAID 3 array.
Since parity is used, a RAID 3 stripe set can withstand a single disk failure without losing data or access to data.
Advantages
RAID-3 provides high throughput (both read and write) for large data transfers.
Disk failures do not significantly slow down throughput.
Disadvantages
This technology is fairly complex and too resource intensive to be done in software.
Performance is slower for random, small I/O operations.
Ideal use
RAID 3 is not that common in prepress.
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