Adaptec 44300 Installation And User Manual

Also see for 48300: Datasheet Installation and user guide

Contents

Adaptec 44300 Installation And User Manual Manual pdf 8 page image

Contents ● 8Understanding Adaptec Storage ManagerFeatures.............................................................................................................. 45Overview............................................................................................................ 45Physical Devices View................................................................................. 46Logical Devices View .................................................................................. 46Changing How Drives are Displayed ............................................................... 46Collapsed and Expanded Views ....................................................................... 47Component Views............................................................................................. 48Solving ProblemsTroubleshooting Checklist ............................................................................... 50Recovering from a Disk Drive Failure ............................................................. 50Failed Disk Drive Protected by a Hot Spare.............................................. 50Failed Disk Drive Not Protected by a Hot Spare....................................... 51Failure in Multiple Arrays Simultaneously................................................ 51Disk Drive Failure in a RAID 0 Array........................................................ 51Multiple Failures in the Same Array .......................................................... 51Introduction to SASTerminology Used in This Chapter ................................................................. 53What is SAS?...................................................................................................... 53How Do SAS Devices Communicate?.............................................................. 53What’s a Phy? .................................................................................................... 54What’s a SAS Port?............................................................................................ 54What’s a SAS Address?...................................................................................... 55What’s a SAS Connector? ................................................................................. 55What do SAS Cables Look Like?....................................................................... 55How are Disk Drives Identified in SAS? .......................................................... 55What are the SAS Connection Options?.......................................................... 55Direct-attach Connections ......................................................................... 56Backplane Connections .............................................................................. 56SAS Expander Connections........................................................................ 56How is SAS Different from Parallel SCSI? ....................................................... 57Understanding RAIDRAID Technology Overview............................................................................. 59Understanding Drive Segments ................................................................. 59Stripe-unit Size............................................................................................ 59Selecting a RAID Level and Tuning Performance..................................... 59RAID 0 (Non-RAID Arrays) ............................................................................ 60RAID 1 Arrays ................................................................................................... 61RAID 10 Arrays ................................................................................................. 61