Compaq StorageWorks 4000 - RAID Array User's Guide download pdf (Page 154)

Hard Drive Arrays

RAID 0 16, 32, 64, 128, , 512

RAID 1 16, 32, 64, 128, , 512

RAID 4 16, , 64, 128

RAID 5 16, , 64, 128

For example, consider an operating system that typically requests data in

32-sector blocks. The array controller distributes the data so that the first

32-sectors of data are on the first drive in the array. The array controller

continues distributing the next 32 sectors on the second drive, the next

32-sectors on the third drive, and so on. Evenly distributed user data across all

drives in an array results in improved performance by allowing data access to

all drives simultaneously.

DATADATADATADATA

Daz-9-11.EPS

Figure E-8. Data striping distributes data across all physical drives

1 2 ... 149 150 151 152 153 154 155 156 157 158 159 ... 179 180

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Compaq StorageWorks 4000 - RAID Array User's Guide Page 154