Adaptec 44300, 58300, 48300 Managing Your Storage Space, Solving Problems, Introduction to SAS

	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
B	Understanding RAID
	RAID Technology Overview	65
	Understanding Drive Segments	65
	Stripe-Unit Size	65
	RAID 0 (Non-RAID Arrays)	65
	RAID 1 Arrays	66