Dell PowerVault TL2000 Instrukcja Użytkownika Pobierz pdf (Strona 9)

Performance Considerations for Tape Drives and Libraries 9

RAID 0

Commonly known as striping, RAID 0 allows two or more disks to be joined to create one virtual

drive in the fashion of a single LUN. It is referred to as striping because data is written across all of

the disks in the array, not just to one disk at a time. Thus, the throughput is spread across

channels (

being the number of hard drives in the array) instead of a single channel for a single

hard disk. This results in excellent read/write performance, but no fault tolerance.

Figure 1-2 shows four hard drives in a RAID 0 configuration. Data is striped across all four hard

drives, resulting in four channels for reading and writing to the array.

Figure 1-2. Example RAID 0 Configuration

SCSI or RAID

Controller

Tape Drive

D13

D17

D10

D14

D18

D11

D15

D19

D12

D16

D20

Hard Drive 1 Hard Drive 2 Hard Drive 3 Hard Drive 4

D = Data Byte

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 175 176

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Dell PowerVault TL2000 Instrukcja Użytkownika Strona 9