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Switchovers
ServerNet Nomadic Disk User’s Guide—425485-001
5-3
Switchover Examples
Switchover Examples
The examples in this section show the sequence of events and commands used to
perform a switchover. For more information about the commands used in these
examples:
•
For detailed information about the Nomadic Disk Manager commands, see
Section 7, Nomadic Disk Manager Interface.
•
For information about the switch command interface (SWCI), see Section 6, Switch
Command Interface (SWCI).
Assumptions
For these examples, assume the following configuration:
•
The ServerNet Nomadic Disk volumes are connected to two nodes:
°
\PRI is the primary node.
°
\BCK is the backup node.
•
The ServerNet Nomadic Disk volumes are connected to the two nodes using
ServerNet Nomadic Disk fiber-optic switches in a standard configuration.
°
The primary disk drives are connected to \PRI.
°
The mirror disk drives are connected to \BCK.
•
The entire application environment (object files, control files, startup and shutdown
files, and so on) is located on a Nomadic volume.
•
Example 5-1 and Example 5-2 show the contents of the Nomadic Disk Manager
configuration files used for the examples in this section. The
$SYSTEM.NOMADIC.NDCONFIG files are shown for \PRI and \BCK. For
detailed descriptions of all configuration statements, see Nomadic Disk Manager
Configuration Statements on page 3-9.
Example 5-1. NDCONFIG on \PRI
SET PATH P $TRM1.#A 1 STRAIGHT
SET PATH B $TRM1.#A 2 STRAIGHT
SET PATH M $MOD1.#A 1 CROSSED
SET PATH MB $MOD1.#A 2 CROSSED
SET VOL $DATA01
SET VOL $DATA02
SET VOL $DATA03
SET VOL $DATA04
SET VOL $DATA05
SET VOL $DATA06
SET VOL $DATA07
SET VOL $DATA08
ADD SEGMENT SEGMENT-1, DATA
- ServerNet Nomadic Disk 1
- User’s Guide 1
- Document History 2
- Index Examples Figures Tables 3
- 4. Switch Modules 4
- 5. Switchovers 4
- Contents 5
- A. Part Numbers 6
- Table 6-1 7
- Summary of SWCI Commands 6-8 7
- Table A-1 7
- What’s New in This Guide 10
- New and Changed Information 10
- About This Guide 11
- Where to Get More Information 12
- Your Comments Invited 12
- Notation Conventions 13
- Remote Disk Drive Mirroring 18
- Switchover 19
- VST101.vsd 20
- Supported Database Products 21
- Unsupported Database Products 22
- Nomadic Disk Software 24
- Nomadic Disk Hardware 25
- Disk Manager 29
- Nomadic Disk Manager Files 30
- > VOLUME $SYSTEM.NOMADIC 31
- > OBEY CREATOR 31
- CONFIG^FILE 33
- Configuration File Examples 34
- ADD DEFINE Statement 38
- ADD SEGMENT Statement 39
- PROCESS Statement 40
- PROCESS FUP CPU 3, PRI 151 41
- SET PATH Statement 42
- SET VOL Statement 43
- Switch Modules 45
- Switch Controller Card 47
- SCC Key Switch 48
- SCC Temperature Sensors 48
- SCC LEDs 49
- Alarm Port 50
- Switch Card 51
- Switch Card Toggle Switches 52
- Switch Card LEDs 53
- Switchovers 55
- Preparing for a Switchover 56
- Switchover Examples 57
- Position 58
- Planned Switchovers 59
- On Backup Node \BCK 60
- Unplanned Switchovers 61
- Switchback 62
- On the Primary Node \PRI 63
- > SWCI $SWITCH1.#PRI 66
- SWCI $SWITCH1.#PRI> STATUS 66
- Communications 67
- Switch Module Device Name 69
- Starting SWCI 70
- Stopping SWCI 71
- SWCI Commands 72
- ALARM Command 73
- Consideration 73
- LOCK Command 75
- LOG Command 76
- OBEY Command 77
- SELFTEST Command 78
- STATUS Commands 79
- SWITCH Command 87
- UNLOCK Command 89
- Considerations 89
- SWCI Messages 90
- Startup message not found 92
- Environmental Alert Messages 114
- Considerations 116
- Nomadic Disk Manager Commands 117
- Command Description Page 118
- ASSUME Command 119
- Examples 119
- DOWN Command 120
- EXIT Command 121
- GIVE Command 122
- HELP Command 124
- HISTORY Command 125
- LISTDEV Command 126
- LISTOPENS Command 127
- OUT Command 128
- RESET Command 129
- SEGMENTS Command 130
- SQL Command 131
- STATUS Command 131
- TAKE Command 133
- TMF Command 135
- UP Command 135
- VOLUMES Command 136
- Part Numbers 137
- Mirroring 139
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