RAID 5 Scaling Tests With Up To Eight Drives

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.

Swipe to scroll horizontally
System Components
Processor(s)Dual Intel Pentium 4 Xeon, 2.8 GHz, 512 kB Cache, FSB 533
Memory2x 512 MB PC2100 Registered ECC, Samsung
MotherboardAsus PP-DLW, Rev. 1.03 Intel E7505 Chipset
Graphics CardMatrox Millennium G450, AGP, 32 MB
Storage Subsystem
System Hard DriveWestern Digital WD1200JB, 120 GB 7,200 rpm, 8 MB Cache
RAID ControllerRaidcore RC4000 PCI-X
Hard Drives8x Western Digital WD360 Raptor, 10,000 rpm, 8 MB Cache
Intel ChipsetIntel Chipset Installation Utility
RAID Controller DriverRaidcore Driver 1.0.RC-100-200461.2
OSWindows XP Professional Build 2600 Service Pack 1