RAID level 30
Striping across dedicated parity RAID systems
RAID level 30 is also known as striping of dedicated parity arrays. It is a combination of RAID level 3 and RAID level 0. RAID level 30 provides high data transfer rates, combined with high data reliability. RAID 30 is best implemented on two RAID 3 disk arrays with data striped across both disk arrays. RAID 30 breaks up data into smaller blocks, and then stripes the blocks of data to each RAID 3 raid set. RAID 3 breaks up data into smaller blocks, calculates parity by performing an Exclusive OR on the blocks, and then writes the blocks to all but one drive in the array. The parity bit is created using the Exclusive OR is then written to the last drive in each RAID 3 array. The size of each block is determined by the stripe size parameter, which is set when the RAID is created.
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Advantages
RAID level 30 can sustain one to four drive failures while maintaining data integrity if each failed disk is in a different RAID 3 array.
Offers highest level of redundancy and performance
Disadvantages
Very costly to implement
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Application
Data warehousing
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