Contents 4
Controller category........................................................................................................................ 34
Array category.............................................................................................................................. 37
Logical Drive category ................................................................................................................... 37
Error reporting ........................................................................................................................................ 40
ACU scripting error messages ......................................................................................................... 40
Using the Command Line Interface................................................................................................ 44
Overview of the ACU CLI ......................................................................................................................... 44
Running the CLI ............................................................................................................................. 44
CLI syntax..................................................................................................................................... 45
Keyword abbreviations .................................................................................................................. 45
Hiding warning prompts................................................................................................................. 46
Querying a device......................................................................................................................... 46
Help ............................................................................................................................................ 46
Typical procedures .................................................................................................................................. 46
Creating a logical drive ................................................................................................................. 47
Modifying the controller chassis name.............................................................................................. 49
Using Selective Storage Presentation ................................................................................................ 49
Deleting target devices ................................................................................................................... 51
Identifying devices ......................................................................................................................... 51
Expanding an array....................................................................................................................... 52
Extending a logical drive................................................................................................................ 52
Managing spare drives .................................................................................................................. 52
Migrating a logical drive................................................................................................................ 53
Changing the Rebuild Priority setting................................................................................................ 53
Changing the Expand Priority setting................................................................................................ 54
Changing the controller cache ratio ................................................................................................. 54
Changing the surface scan delay time .............................................................................................. 54
Re-enabling a failed logical drive .................................................................................................... 55
Enabling or disabling the drive cache .............................................................................................. 55
Enabling or disabling the array accelerator ...................................................................................... 55
Disabling a redundant controller...................................................................................................... 55
Setting the target ........................................................................................................................... 56
Setting the preferred path mode ...................................................................................................... 57
Rescanning the system.................................................................................................................... 57
Probability of logical drive failure ................................................................................................. 58
Factors involved in logical drive failure ...................................................................................................... 58
Probability of logical drive failure vs. number of drives in array ........................................................... 59
Drive arrays and fault-tolerance methods ....................................................................................... 60
Drive arrays............................................................................................................................................ 60
Fault-tolerance methods ............................................................................................................................ 62
Hardware-based fault-tolerance methods .......................................................................................... 62
Alternative fault-tolerance methods ................................................................................................... 67
Diagnosing array problems.......................................................................................................... 68
Diagnostic tools ...................................................................................................................................... 68
Acronyms and abbreviations........................................................................................................ 69
Index......................................................................................................................................... 70
