HP RP7 Retail System Model 7100 Instrukcja Użytkownika Pobierz pdf (Strona 8)

Technical white paper | AHCI and RAID on HP rp7800, rp5810, and rp5800 Retail Systems

RAID 5 with three hard drives

RAID 5 has been used in servers for many years and is one of the most common types of RAID. RAID 5 uses striping with

parity data in distributed blocks across all member disks. Therefore, the mass storage controller can simultaneously write

new information to two hard drives and parity information to the third hard drive*, so if one hard drive fails, the RAID

controller can rebuild all the information after the volume degradation occurred. Hence, RAID 5 with three hard drives has

similar performance to RAID 0 with two hard drives, and the reliability of RAID 1 with a minimum of three hard drives.

*Only HP rp5810 and rp5800 Retail Systems support three hard drives.

Table 4. RAID 5 with three hard drives (parity).

First disk

Second disk Third disk

Data Segment 1 Data Segment 2 Parity for 1 and 2

Data Segment 3 Parity for 3 and 4 Data Segment 4

Parity for 5 and 6 Data Segment 5 Data Segment 6

Data Segment 7 Data Segment 8 Parity for 7 and 8

Data Segment 9 Parity for 9 and 10 Data Segment 10

Parity for 11 and 12 Data Segment 11 Data Segment 12

Data Segment 13 Data Segment 14 Parity for 13 and 14

Data Segment 15 Parity for 15 and 16 Data Segment 16

Parity for 17 and 18 Data Segment 17 Data Segment 18

Figure 4. RAID 5 with three HDDs.

Intel Matrix RAID Technology

This technology provides protection against data loss from a hard drive failure and faster access to digital photo, video, and

music files by supporting NCQ as well as RAID 0, 1, 5, and 10. As shown in Figure 5, Matrix RAID enables two RAID levels to

be combined for data loss protection plus performance.

A B C D E F…

PE-F

…

PC-D

…

HDD 1 HDD 2 HDD 3

PA-B

…

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 26 27

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