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
