Nec Disk Array Controller N8103-89 Manual de usuario descargar pdf (Pagina 92)

2. RAID Levels

This section details the RAID levels which the disk array controller can support.

2-1. Characteristics of RAID Levels

The table below lists the characteristics of the RAID levels.

Level Function Redundancy Characteristics

RAID0 Striping No Data read/write at the highest rate

Largest capacity

Capacity: (capacity of single HDD) ×

(number of HDDs)

RAID1 Mirroring Yes Two HDDs required

Capacity: capacity of single HDD

RAID5

Striping of both data

and redundant data

Yes Three or more HDDs required

Capacity: (capacity of single HDD) ×

((number of HDDs) - 1)

RAID10

Combination of striping

and mirroring

Yes Four HDDs required

Capacity: (capacity of single HDD) × 2

2-2. RAID0

In RAID 0, data to be recorded is distributed to HDDs. The mode is called "striping."

In the figure below, data is recorded in stripe 1 (disk1), stripe 2 (disk 2), and stripe 3 (disk

3)… in the order. Because RAID0 allows all HDDs to be accessed collectively, it can

provide the best disk access performance.

Notice

RAID 0 cannot have data redundancy. If a HDD is defected, the data saved

in the HDD cannot be recovered.

Disk array controller

Disk 1 Disk 2

Stripe 1

Disk 3

Stripe 4

Stripe 2

Stripe 5

Stripe 3

Stripe 6

1 2 ... 87 88 89 90 91 92 93 94 95 96 97 ... 127 128

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Nec Disk Array Controller N8103-89 Manual de usuario Pagina 92