Capturing a configuration ................................................................................................................. 74
Using an Input script ......................................................................................................................... 74
Creating an ACU script file ............................................................................................................... 75
Script file options ............................................................................................................................. 76
ACU scripting warning messages ...................................................................................................... 86
ACU scripting error messages ........................................................................................................... 87
Probability of logical drive failure ................................................................................................. 92
Factors involved in logical drive failure ......................................................................................................... 92
Relative probability of failure for different logical drives ....................................................................... 93
Drive arrays and fault-tolerance methods ....................................................................................... 94
Drive arrays ............................................................................................................................................... 94
Fault-tolerance methods ............................................................................................................................... 96
RAID 0—No fault tolerance ............................................................................................................... 97
RAID 1+0 (RAID 10) ......................................................................................................................... 98
RAID 5—distributed data guarding .................................................................................................... 99
RAID 6 (ADG)—Advanced Data Guarding ....................................................................................... 100
RAID 50 ........................................................................................................................................ 101
RAID 60 ........................................................................................................................................ 102
Comparing the hardware-based RAID methods ................................................................................. 102
Selecting a RAID method................................................................................................................. 103
Alternative fault-tolerance methods ................................................................................................... 103
Diagnosing array problems ........................................................................................................ 105
Diagnostic tools ....................................................................................................................................... 105
Troubleshooting resources ......................................................................................................................... 105
Acronyms and abbreviations ...................................................................................................... 107
Index ....................................................................................................................................... 109
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