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Compaq StorageWorks 4000 - RAID Array Guida Utente Pagina 154

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