RAID 50
| RAID 50 provides the features of both RAID 0 and RAID 5. RAID 50 includes both |
| parity and disk striping across multiple drives. RAID 50 is best implemented on two |
| RAID 5 disk arrays with data striped across both disk arrays. RAID 50 breaks up data |
| into smaller blocks, and then stripes the blocks of data to each RAID 5 raid set. RAID 5 |
| breaks up data into smaller blocks, calculates parity by performing an |
| blocks, and then writes the blocks of data and parity to each drive in the array. The size of |
| each block is determined by the stripe size parameter, which is set during the creation of |
| the RAID set. |
| RAID 50 can sustain one to four drive failures while maintaining data integrity if each |
| failed disk is in a different RAID 5 array. |
Uses | RAID 50 works best when used with data that requires high |
| reliability, high request rates, and high data transfer and |
| medium to large capacity. |
Strong Points | RAID 50 provides high data throughput, data redundancy, |
| and very good performance. |
Weak Points | Requires 2 to 4 times as many parity drives as RAID 5. |
Drives | Six to 15 |
| The initiator takes one ID per channel. This leaves 15 IDs |
| available for one channel. |
26MegaRAID Express 500 Hardware Guide