Read Policy

Does my controller support this feature? See Supported Features.

The read policies indicate whether the controller should read sequential sectors of the virtual disk when seeking data.

  • Read-Ahead — The controller reads sequential sectors of the virtual disk when seeking data. Read-ahead policy may improve system performance if the data is written to the sequential sectors of the virtual disk.
  • No-Read-Ahead — Selecting no-read-ahead policy indicates that the controller should not use read-ahead policy.
  • Adaptive Read-Ahead — The controller initiates read-ahead only if the two most recent reads requests accessed to sequential sectors of the disk. If subsequent read requests access the random sectors of the disk, the controller reverts to no-read-ahead policy. The controller continues to evaluate whether read requests are accessing sequential sectors of the disk, and can initiate read-ahead if necessary.
  • Read Cache Enabled — The controller reads the cache information to verify if the requested data is available in the cache before retrieving the data from the disk. Reading the cache information first can provide faster read performance because the data (if available in the cache) can be retrieved more quickly from the cache than from the disk.
  • Read Cache Disabled — The controller retrieves data directly from the disk and not from the cache.