Asus AZCRB Global Array Manager Transition Tool - Page 22

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. 22 ASUS Zero-Channel RAID Board