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Dell PowerEdge RAID Controller 9 User’s Guide H330, H730, and H830

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Virtual disk read cache policies

The read policy of a virtual disk determines how the controller handles reads to that virtual disk.
Table 1. Read policies The read policy of a virtual disk determines how the controller handles reads to that virtual disk. The read policies are
Feature Description
Read ahead Allows the controller to read sequentially ahead of requested data and to store the additional data in cache memory, anticipating that the data is required soon. This speeds up reads for sequential data, but there is slight improvement when accessing random data.
No read ahead Disables the read ahead capability.
Adaptive read ahead Adaptive read ahead is no longer supported. Selecting adaptive read ahead is equivalent to selecting the read ahead option.

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