Mylex DAC960PG, Installation Manual

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Manual No. 771971 ix
Contents
Chapter 1
Introduction
Product Description ........................................................................... 1-1
Standard Package Contents ............................................................. 1-4
Options ....................................................................................... 1-4
User-Supplied Items ................................................................... 1-4
Controller Functions and Features .................................................... 1-5
Key Features .............................................................................. 1-5
DAC960PG Specifications ................................................................ 1-8
Specifications (continued) .......................................................... 1-9
Chapter 2
Functional Description
Overview ........................................................................................... 2-1
Controller Components ..................................................................... 2-1
SCSI Functions ................................................................................. 2-6
Multiple SCSI Format Support ................................................... 2-6
SCSI Cabling and Termination Conventions .............................. 2-6
SCSI Address (Target ID) Selection ........................................... 2-7
Drive Organization ............................................................................. 2-8
Physical Drives (Drive Groups or Packs) ................................... 2-8
Logical Drives (System Drives) .................................................. 2-8
Configuration on Disk ................................................................. 2-9
RAID Management .......................................................................... 2-12
RAID Techniques and Terms ................................................... 2-13
Striping Terminology ................................................................ 2-17
Drive Management .......................................................................... 2-18
Controlling Physical Drive States ............................................. 2-18
Controlling Logical Unit States ................................................. 2-19
Controlling Standby Replacement Drives (Hot Spares) ........... 2-20
Hot-Swap Drive Replacement .................................................. 2-21
Disk Failure Detection .............................................................. 2-21
Disk Media Error Management ................................................. 2-21
Checking Disk Consistency ...................................................... 2-22
Cache Management ........................................................................ 2-23
Read Cache ............................................................................. 2-23
Write-Back Cache .................................................................... 2-23
Write-Through Cache ............................................................... 2-23
Cache Battery Backup ............................................................. 2-23