x
Idle Drive Failure Detection ............................................................................. 23
Periodic Auto-Detect Failure Drive Swap Check Time .................................... 23
9.3
Monitoring and Safety Mechanisms........................................................... 25
Dynamic Switch Write-Policy........................................................................... 25
View Peripheral Device Status ........................................................................ 25
Controller Auto-Shutdown - Event Trigger Option ........................................... 26
9.4
Disk Array Parameters ................................................................................. 27
Rebuild Priority................................................................................................. 27
Verification on Writes....................................................................................... 28
Chapter 10 Redundant Controller
10.1
Operation Theory ...................................................................................... 10-1
10.1.1 Setup Flowchart................................................................................ 10-2
10.1.2 Considerations Related to Physical Connection............................... 10-2
SCSI-Based Controllers................................................................................ 10-2
Fibre-Based Controllers................................................................................ 10-3
10.1.3 Grouping Hard Drives and LUN Mapping ......................................... 10-4
Logical Drive, Logical Volume, and Logical Partitions .................................. 10-5
System Drive Mapping:................................................................................. 10-6
Primary and Secondary IDs.......................................................................... 10-6
Mapping ........................................................................................................ 10-7
10.1.4 Fault-Tolerance ................................................................................ 10-8
What Is a Redundant Controller Configuration?........................................... 10-8
How does Failover and Failback Work?....................................................... 10-9
A. Channel Bus ............................................................................................ 10-9
B. Controller Failover and Failback............................................................ 10-11
C. Active-to-Active Configuration: .............................................................. 10-11
D. Traffic Distribution and Failover Process .............................................. 10-12
Symptoms................................................................................................... 10-13
Connection:................................................................................................. 10-13
10.2
Preparing Controllers ............................................................................. 10-14
10.2.1 Requirements: ................................................................................ 10-14
Cabling Requirements: ............................................................................... 10-14
Controller Settings: ..................................................................................... 10-15
10.2.2 Limitations....................................................................................... 10-16
10.2.3 Configurable Parameters................................................................ 10-16
Primary or Secondary ................................................................................. 10-16
Active-to-Active Configuration .................................................................... 10-17
Active-to-Standby Configuration ................................................................. 10-17
Cache Synchronization ............................................................................... 10-17
Battery Support ........................................................................................... 10-17
10.3
Configuration........................................................................................... 10-19
10.3.1 Via Front Panel Keypad .................................................................. 10-20
Redundant Configuration Using Automatic Setting .................................... 10-20
Enable Redundant Controller ..................................................................... 10-20
Autoconfig................................................................................................... 10-20
2. Controller Unique ID ............................................................................... 10-20
Redundant Configuration Using Manual Setting......................................... 10-21
1. Enable Redundant Controller ................................................................. 10-21
2. Controller Unique ID ............................................................................... 10-21
Starting the Redundant Controllers ............................................................ 10-22
Creating Primary and Secondary ID ........................................................... 10-22
Drive Channel ............................................................................................. 10-22
Host Channel .............................................................................................. 10-23
Assigning a Logical Drive/Logical Volume to the Secondary Controller ..... 10-23
