All-around Solution: RAID 5
This configuration is taken from the packaging of a Promise controller. The data storage illustration is easy to follow, which in this example is on a total of four hard drives.
A RAID 5 requires at least three hard drives and operates all drives almost simultaneously. In order to ensure data security, a parity bit is calculated for each information unit and saved on one of the available drives on a rotating basis.
Now the question arises: what is the ideal number of drives? More drives fundamentally mean a greater risk of failures as well as higher energy requirements, while performance may suffer to an unacceptable degree with only a few drives. We tested all configurations, using up to eight drives.
|Processor(s)||Dual Intel Pentium 4 Xeon, 2.8 GHz, 512 kB Cache, FSB 533|
|Memory||2x 512 MB PC2100 Registered ECC, Samsung|
|Motherboard||Asus PP-DLW, Rev. 1.03 Intel E7505 Chipset|
|Graphics Card||Matrox Millennium G450, AGP, 32 MB|
|System Hard Drive||Western Digital WD1200JB, 120 GB 7,200 rpm, 8 MB Cache|
|RAID Controller||Raidcore RC4000 PCI-X|
|Hard Drives||8x Western Digital WD360 Raptor, 10,000 rpm, 8 MB Cache|
|Intel Chipset||Intel Chipset Installation Utility 126.96.36.1992|
|RAID Controller Driver||Raidcore Driver 1.0.RC-100-200461.2|
|OS||Windows XP Professional Build 2600 Service Pack 1|