RAID 30
| 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 |
| writes the blocks to all but one drive in the array. The parity data created during the |
| |
| 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. |
Uses | 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. |
Strong Points | Provides data reliability and high data transfer rates. |
Weak Points | Requires 2 – 4 times as many parity drives as RAID 3. |
Drives | Six to 15 |
| The initiator takes one ID per channel. This leaves 15 IDs |
| available for one channel. |
Chapter 3 RAID Levels | 25 |