HP Scripting Toolkit for Windows 9.60 - Manual (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.
All other controllers
without
battery-backed write
cache All other controllers
with battery-backed
write cache RA4x00 with 48MB
cache RA4x00 with 16MB
cache 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
* 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