HP Smart Storage Adstrator manual QueueDepth, RapidParityInitialization, ReadCache, WriteCache

QueueDepth

QueueDepth controls the behavior of the cache write queue. This option is used to tune controller performance for video applications and requires the installation of a valid license key. Command values are 2, 4, 8, 16, 32, or Automatic.

RapidParityInitialization

This option enables Rapid Parity Initialization. The RPI command is not supported on all controllers and is dependent on firmware and hard disk support. Command options are Enable or Disable.

ReadCache, WriteCache

Enter a number between 0 and 100 to specify the percentage of cache that is to be allocated to drive reads or writes. The default values for both options are controller firmware-dependent.

The allowable cache ratios depend on the controller model and whether it has battery-backed write cache.

RebuildPriority, ExpandPriority

These options establish the priority for rebuild and expand functions. Rebuild has four possible values: Low, Medium, MediumHigh, and High. MediumHigh is only available when Rapid Parity Initialization is enabled.

Expand has only three possible values: Low, Medium, and High. These options are not required.

SurfaceScanDelay

Enter a number between 0 and 30 to specify the duration of the surface scan delay in seconds. This option is not required. If you do not specify a value for this option, the delay remains unchanged. A value of 0 disables the scan.

SurfaceScanDelayExtended

Enter a number between 0 and 300 to specify the duration of the surface scan delay in tenths of seconds. This option is not required. If you do not specify a value for this option, the delay remains unchanged. A value of 0 disables the scan.

If this parameter and SurfaceScanDelay are both in the input file, this parameter takes precedence.

SurfaceScanMode

This parameter specifies the Surface Scan Mode with the following values:

•Idle—The delay interval is set with the normal values from SurfaceScanDelay or

SurfaceScanDelayExtended.

•High—The surface scan enters a mode guaranteed to make progress despite the level of controller I/O.

•Disabled—No mode is selected.

Video performance options

To use this features on an HP Smart Array G6 or G7 controller, a registered SAAP ("About SAAP" on page 131) license key is required.

To optimize the controller performance for video, set values for the following options as indicated:

Operations 91