Adaptec RAID 1220SA - Page 8

Contents ● 8
9 Managing Your Storage Space
About Adaptec Storage Manager ..................................................................... 51
Installing Adaptec Storage Manager........................................................ 51
About the HRCONF Command Line Utility .................................................. 51
About the ARC Utility ...................................................................................... 52
About the Adaptec Flash Utility....................................................................... 52
Which Utility Should I Use?............................................................................. 52
10 Solving Problems
Troubleshooting Checklist ............................................................................... 54
Recovering from a Disk Drive Failure ............................................................. 54
Failed Disk Drive Protected by a Hot Spare ........................................... 54
Failed Disk Drive Not Protected by a Hot Spare .................................... 54
Failure in Multiple Arrays Simultaneously ............................................. 55
Disk Drive Failure in a RAID 0 Array ..................................................... 55
Multiple Failures in the Same Array........................................................ 55
Resetting the Controller.................................................................................... 55
A Introduction to SAS
Terminology Used in This Appendix............................................................... 58
What is SAS?...................................................................................................... 58
How Do SAS Devices Communicate?.............................................................. 59
What’s a Phy? .................................................................................................... 59
What’s a SAS Port?............................................................................................ 59
What’s a SAS Address?...................................................................................... 60
What’s a SAS Connector? ................................................................................. 60
What do SAS Cables Look Like?....................................................................... 60
How are Disk Drives Identified in SAS? .......................................................... 60
What are the SAS Connection Options?.......................................................... 61
Direct-Attach Connections...................................................................... 61
Backplane Connections............................................................................ 61
SAS Expander Connections ..................................................................... 61
How is SAS Different from Parallel SCSI? ....................................................... 62
BUnderstanding RAID
RAID Technology Overview............................................................................. 65
Understanding Drive Segments............................................................... 65
Stripe-Unit Size ........................................................................................ 65
RAID 0 (Non-RAID Arrays) ............................................................................ 65
RAID 1 Arrays ................................................................................................... 66