Table of Contents | |
1 | Overview .................................................. | 1 |
| Single Ended and Differential SCSI Buses....................... | 2 |
| Maximum Cable Length for SCSI Standards.................... | 2 |
| Documentation.................................................................. | 3 |
| MegaRAID Express 500 Block Diagram.......................... | 4 |
2 | Introduction to RAID................................ | 5 |
| RAID Benefits .................................................................. | 5 |
| In This Chapter ................................................................. | 6 |
| MegaRAID Express 500 – Host-Based RAID Solution ... | 7 |
| RAID Overview................................................................ | 8 |
| Fault Tolerance................................................................. | 8 |
| Consistency Check............................................................ | 8 |
| Disk Rebuild..................................................................... | 9 |
| Hot Spares ...................................................................... | 10 |
| Hot Swap ........................................................................ | 10 |
| Parity .............................................................................. | 11 |
| Disk Striping................................................................... | 12 |
| Disk Mirroring................................................................ | 13 |
| Disk Spanning................................................................. | 14 |
| Logical Drive.................................................................. | 15 |
| Logical Drive States ....................................................... | 15 |
| SCSI Drive States ........................................................... | 15 |
| Disk Array Types............................................................ | 16 |
| Enclosure Management................................................... | 16 |
3 | RAID Levels............................................ | 17 |
| Selecting a RAID Level.................................................. | 18 |
| RAID 0 ........................................................................... | 19 |
| RAID 1 ........................................................................... | 20 |
| RAID 3 ........................................................................... | 21 |
| RAID 5 ........................................................................... | 23 |
| RAID 10 ......................................................................... | 24 |
| RAID 30 ......................................................................... | 25 |
| RAID 50 ......................................................................... | 26 |
