Adaptec SCSI 58300 Installation And User Manual page 8

9 Managing Your Storage Space
About Adaptec Storage Manager ..................................................................... 50
Installing Adaptec Storage Manager........................................................ 50
About the HRCONF Command Line Utility .................................................. 50
About the ARC Utility ...................................................................................... 51
About the Adaptec Flash Utility ....................................................................... 51
Which Utility Should I Use? ............................................................................. 51
10 Solving Problems
Troubleshooting Checklist ............................................................................... 53
Recovering from a Disk Drive Failure ............................................................. 53
Failed Disk Drive Protected by a Hot Spare ........................................... 53
Failed Disk Drive Not Protected by a Hot Spare .................................... 53
Failure in Multiple Arrays Simultaneously ............................................. 54
Disk Drive Failure in a RAID 0 Array ..................................................... 54
Multiple Failures in the Same Array........................................................ 54
Resetting the Controller.................................................................................... 54
A Introduction to SAS
Terminology Used in This Appendix............................................................... 57
What is SAS?...................................................................................................... 57
How Do SAS Devices Communicate?.............................................................. 58
What's a Phy? .................................................................................................... 58
What's a SAS Port?............................................................................................ 58
What's a SAS Address?...................................................................................... 59
What's a SAS Connector? ................................................................................. 59
What do SAS Cables Look Like?....................................................................... 59
How are Disk Drives Identified in SAS? .......................................................... 59
What are the SAS Connection Options?.......................................................... 60
Direct-Attach Connections...................................................................... 60
Backplane Connections............................................................................ 60
SAS Expander Connections ..................................................................... 60
How is SAS Different from Parallel SCSI? ....................................................... 61
B Understanding RAID
RAID Technology Overview............................................................................. 64
Understanding Drive Segments............................................................... 64
Stripe-Unit Size ........................................................................................ 64
RAID 0 (Non-RAID Arrays) ............................................................................ 64
RAID 1 Arrays ................................................................................................... 65
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