HP EliteDesk 800 G1 Base Model Tower PC Manual de usuario descargar pdf (Pagina 7)

Technical white paper | AHCI and RAID on HP EliteDesk and EliteOne 800 Business PCs

RAID 0 with two hard drives (striped)

HP supports RAID 0, but we do not recommend it for business PC users. Lack of redundancy causes less than half the

reliability of a single hard drive system since the Mean Time Between Failure (MTBF) of RAID 0 is equal to the MTBF of an

individual drive, divided by the number of drives.

Table 2.

RAID 0 with two hard drives (striped).

First disk Second disk

Data Segment 1 Data Segment 2

Data Segment 3 Data Segment 4

Data Segment 5 Data Segment 6

Data Segment 7 Data Segment 8

Data Segment 9 Data Segment 10

Data Segment 11 Data Segment 12

Data Segment 13 Data Segment 14

Data Segment 15 Data Segment 16

In table 2, each “Data Segment n” represents a group of data, known as a strip. In this case, each row represents a stripe.

RAID 0 represented in the table above shows how information is segmented, made into chunks or strips, and stored across

the stripes of the hard drive members of this RAID volume.

To illustrate the concept of RAID 0 and striping, Figure 1 shows how a sequence of data “ABCD...” is stored in a RAID 0 mode.

In this example, each letter represents a segment or strip. The graphic shows how the various pieces of the information go

to different hard drives. If any segment of RAID 0 fails, all information from all members is lost.

At a higher reliability cost with faster performance, the HP Compaq EliteDesk/EliteOne 800-series Business PC Convertible

Minitower also allows for RAID 0 with three hard drives. RAID 0 with two or three hard drives is a supported configuration.

RAID 0 with three hard drives is shown in Figure 2.

Figure 2. Performance – RAID 0 with three HDDs.

A B C D …

…

HDD 1 HDD 2 HDD 3

…

A B C D …

…

HDD 1 HDD 2

Figure 1. Performance – RAID 0 with two HDDs

1 2 3 4 5 6 7 8 9 10 11 12 ... 27 28

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HP EliteDesk 800 G1 Base Model Tower PC Manual de usuario Pagina 7