HP Smart Storage Administrator - Manual (Page 79)

Operations 79
IRPEnable
The IRPEnable option controls the behavior of the controller Inconsistency Repair Policy. This option is used
to tune the controller performance for Video applications and requires the installation of a valid license key.
Command options are Enable or Disable.
LicenseKey, DeleteLicenseKey
These options enable you to enter a 25-character license key to activate or uninstall some controller features.
Hyphens can be entered, but are not required.
MNPDelay
The MNPDelay option controls the behavior of the controller Monitor and Performance Analysis Delay and
is expressed in values ranging from 0 to 60. This option is primarily used to tune controller performance for
video applications and requires the installation of a valid license key.
NoBatteryWriteCache
With this option, the controller can enable write cache when no battery is present or when the battery fails.
Values are Enable or Disable. The default is Disable.
Some controllers do not support this option.
PreferredPathMode
The setting that you select for this option determines how the preferred I/O path to a particular logical drive
is set for a redundant array controller that is in an active/active configuration.
Not all controllers support this feature, and controllers in an active/standby configuration disregard this
option.
• Auto is the default setting for new configurations. In this case, the storage system automatically selects
the I/O path from the redundant controller to the logical drive and dynamically load balances all paths.
• Manual enables you to assign the logical drive to a specific redundant controller. If you select this
setting, use the PreferredPath (on page
85 ) command to specify the path.
If you are reconfiguring a controller and do not specify a setting for this option, the existing setting remains
unchanged.
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.