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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
n
channels (
n
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
D1
D5
D9
D13
D17
D2
D6
D10
D14
D18
D3
D7
D11
D15
D19
D4
D8
D12
D16
D20
Hard Drive 1 Hard Drive 2 Hard Drive 3 Hard Drive 4
D = Data Byte