RAID 30

Uses

Strong Points

Weak Points

Drives

RAID 30 is a combination of RAID 0 and RAID 3. RAID 30 provides high data transfer speeds and 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 data created during 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 during the creation of the RAID set.

RAID 30 can sustain one to four drive failures while maintaining data integrity if each failed disk is in a different RAID 3 array.

Use RAID 30 for sequentially written and read data, pre- press and video on demand that requires a higher degree of fault tolerance and medium to large capacity.

Provides data reliability and high data transfer rates.

Requires 2 – 4 times as many parity drives as RAID 3.

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Chapter 3 RAID Levels

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