HP StorageWorks 1500cs Modular Smart Array - Manual (Page 36)

Scripting in ACU 36
Read:write
ratio RA4x00 with
16MB cache RA4x00 with
48MB cache All other controllers with
battery-backed cache All other controllers
without battery-backed
cache
70:30 Y Y -- --
60:40 Y Y -- --
50:50 Y Y Y --
40:60 -- Y -- --
30:70 -- Y -- --
25:75 -- Y Y --
0:50* Y -- -- --
0:75* -- Y -- --
0:100 -- -- Y --
* The cache ratio percentages do not total 100 in these cases because the additional 16-MB or 48-MB cache
modules are not used. Only the battery-backed write cache is used.
RebuildPriority, ExpandPriority
This option has three possible values: Low, Medium, and High. The default value for an unconfigured
controller is Low.
SurfaceScanDelay
Enter a number between 1 and 30 to specify the duration of the surface scan delay in seconds.
SSPState
There are two settings for this option: Enable and Disable. If you do not specify a value for the SSP State,
the existing setting remains unchanged.
NOTE: The SSPState option is valid only for controllers that enable SSP on a controller basis, such as the
MSA1000 or the Smart Array Cluster Storage controllers. RA4x00 controllers support SSP that is enabled on
a logical drive basis, and use the LogicalDriveSSPState option ("
LogicalDriveSSPState " on page 39 ) instead.
If you enable SSP, you must also specify an adapter for one or more logical drives by using the
SSPAdaptersWithAccess option ("
SSPAdaptersWithAccess " on page 39 ). Otherwise, SSP is automatically
disabled.
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 39 ) 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.