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Contents ● 10
A Introduction to SAS
Terminology Used in This Chapter ................................................................. 89
What is SAS?...................................................................................................... 89
How Do SAS Devices Communicate?.............................................................. 90
What’s a Phy? .................................................................................................... 90
What’s a SAS Port?............................................................................................ 91
What’s a SAS Address?...................................................................................... 91
What’s a SAS Connector? ................................................................................. 91
What do SAS Cables Look Like?....................................................................... 91
How are Disk Drives Identified in SAS? .......................................................... 92
What are the SAS Connection Options?.......................................................... 92
Direct-attach Connections ......................................................................... 92
Backplane Connections .............................................................................. 92
SAS Expander Connections........................................................................ 93
How is SAS Different from Parallel SCSI? ....................................................... 94
B Understanding RAID
Understanding Drive Segments ....................................................................... 96
Non-redundant Arrays (RAID 0)..................................................................... 96
RAID 1 Arrays ...................................................................................................97
RAID 1 Enhanced Arrays.................................................................................. 97
RAID 10 Arrays .................................................................................................98
RAID 5 Arrays ...................................................................................................99
RAID 5EE Arrays............................................................................................. 100
RAID 50 Arrays ...............................................................................................101
RAID 6 Arrays .................................................................................................102
RAID 60 Arrays ...............................................................................................102
Selecting the Best RAID Level ........................................................................ 103
C Using the Adaptec RAID Configuration Utility
Introduction to the ARC Utility..................................................................... 105
Running the ARC Utility ................................................................................ 105
Navigating the ARC Utility ...................................................................... 105
Using the ACU to Create and Manage Arrays............................................... 105
Creating a New Array ............................................................................... 105
Managing Existing Arrays ........................................................................ 106
Initializing Disk Drives............................................................................. 108
Rescanning Disk Drives............................................................................ 108
Secure Erasing Disk Drives....................................................................... 108
Managing Global Hot Spares ................................................................... 108
Using the ACU to Create and Manage JBODs .............................................. 109
Creating a New JBOD............................................................................... 109
Managing Existing JBODs........................................................................ 109
Using the ACU to Manage the maxCache Pool ............................................ 109
Using SerialSelect to Modify Controller Settings........................................... 110