Array Configuration Utility User Guide

Contents 4
Controller category........................................................................................................................ 34
Array category.............................................................................................................................. 36
Logical Drive category ................................................................................................................... 37
Error reporting ........................................................................................................................................ 39
ACU scripting error messages......................................................................................................... 40
Using the Command Line Interface................................................................................................43
Overview of the ACU CLI ......................................................................................................................... 43
Running the CLI ............................................................................................................................. 43
CLI syntax..................................................................................................................................... 44
Keyword abbreviations .................................................................................................................. 44
Hiding warning prompts................................................................................................................. 45
Querying a device......................................................................................................................... 45
Help ............................................................................................................................................ 45
Typical procedures .................................................................................................................................. 45
Creating a logical drive ................................................................................................................. 46
Sample scenario............................................................................................................................ 46
Modifying the controller chassis name.............................................................................................. 47
Using Selective Storage Presentation................................................................................................ 48
Deleting target devices................................................................................................................... 50
Identifying devices......................................................................................................................... 50
Expanding an array....................................................................................................................... 50
Extending a logical drive................................................................................................................ 50
Managing spare drives .................................................................................................................. 51
Migrating a logical drive................................................................................................................ 51
Changing the Rebuild Priority setting................................................................................................ 52
Changing the Expand Priority setting................................................................................................ 52
Changing the controller cache ratio ................................................................................................. 52
Changing the surface scan delay time.............................................................................................. 53
Re-enabling a failed logical drive .................................................................................................... 53
Enabling or disabling the drive cache .............................................................................................. 53
Enabling or disabling the array accelerator ...................................................................................... 54
Disabling a redundant controller...................................................................................................... 54
Setting the target ........................................................................................................................... 54
Rescanning the system.................................................................................................................... 55
Probability of logical drive failure ................................................................................................. 56
Factors involved in logical drive failure ...................................................................................................... 56
Probability of logical drive failure vs. number of drives in array........................................................... 57
Drive arrays and fault-tolerance methods ....................................................................................... 58
Drive arrays............................................................................................................................................ 58
Fault-tolerance methods............................................................................................................................ 60
Hardware-based fault-tolerance methods ..........................................................................................60
Alternative fault-tolerance methods................................................................................................... 65
Diagnosing array problems.......................................................................................................... 66
Diagnostic tools ......................................................................................................................................66
Acronyms and abbreviations........................................................................................................ 67
Index......................................................................................................................................... 69