HP ProLiant SL2500 HP Scripting Toolkit 9.60 for Windows User Guide - Page 36

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 command to specify the path. If you are reconfiguring a controller and do not specify a setting for this option, the existing setting remains the same. ReadCache, WriteCache Enter a number between 0 and 100 to specify the percentage of cache to be allocated to drive reads or writes. The default value for both options is 50. The allowable cache ratios depend on the controller model and whether it has battery-backed write cache, as described in the following table. A "+" indicates that the specified cache ratio is allowed for that type of controller, while a "-" indicates that the ratio is not allowed. Read:write ratio 100:0 90:10 80:20 75:25 70:30 60:40 50:50 40:60 30:70 25:75 0:50* 0:75* 0:100 RA4x00 with 16MB cache RA4x00 with 48MB cache All other controllers with battery-backed write cache All other controllers without battery-backed write cache * 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 These options have three possible values: Low, Medium, and High. 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 the same. 36 Scripting Toolkit utilities