// ntifs.h

typedef struct _READ_AHEAD_PARAMETERS {
  CSHORT NodeByteSize;
  ULONG  Granularity;
  ULONG  PipelinedRequestSize;
  ULONG  ReadAheadGrowthPercentage;
} READ_AHEAD_PARAMETERS, *PREAD_AHEAD_PARAMETERS;
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Windows Driver Kit DDI reference (ns-ntifs-read_ahead_parameters)

Description

The READ_AHEAD_PARAMETERS structure contains read-ahead parameters.

Members

`NodeByteSize`

Size of the node, in bytes.

`Granularity`

Granularity of read-aheads. This value must be an even power of 2 and greater than, or equal to PAGE_SIZE.

`PipelinedRequestSize`

The request size to be used when performing pipelined read-aheads, in bytes. Each read-ahead request that is pipelined is broken into smaller PipelinedRequestSize-sized requests. This is typically used to increase the throughput by parallelizing multiple requests instead of one single big one.

For backward compatibility, the Cache Manager will break every read-ahead request into two if this value is zero.

`ReadAheadGrowthPercentage`

The growth of read ahead as a percentage of the data that has already been ready by the application so far.

READ_AHEAD_PARAMETERS - NtDoc