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Read Policy - enables the SCSI read-ahead feature for the logical drive. The
configuration options are Normal, Read-ahead, or Adaptive. In Normal setting, the
controller does not use read-ahead for the current logical drive. In Read-ahead , the
controller uses read-ahead for the current logical drive. In Adaptive setting, the
controller begins using read-ahead fi the two most recent disk accesses occurred in
sequential sectors. If all the requests are random, the algorithm reverts to Normal,
but succeeding requests are still evaluated for possible sequential operation.
Cache Policy - applies to reads on a specific logical drive, and does not affect the
read-ahead cache. Cache I/O specifies that all reads are buffered in the cache
memory. Direct I/O specifies that reads are not buffered in the cache memory. Data
is transferred concurrently to cache and host. Direct I/O does not override the cache
policy settings.
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ASUS Zero-Channel RAID Board
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