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Nomadic Disk Manager Interface
ServerNet Nomadic Disk User’s Guide—425485-001
7-20
TAKE Command
UPPATH { -P | -B | -M | -MB | PRIMARY | MIRROR }
specifies that an UP PATHS command be issued instead of the UP VOLUMES
command. Refer to UP Command on page 7-21.
Immediately after ownership is taken, all the Nomadic volumes are in a DOWN
state. The TAKE command normally automatically issues the UP VOLUMES
command.
UPPATH is used only in special circumstances or emergencies.
Considerations
•
If a TAKE command does not contain the SEGMENT option, nor the DATA option,
it works on the current segment. If a current segment has not been set with the
ASSUME command, the last segment defined in the configuration file becomes the
assumed segment. If that segment is a DATA segment, issuing a TAKE command
has the same effect as issuing a TAKE DATA command. If that segment is a SPARE
segment, the TAKE command works only on that segment. Even though SPARE
segments are not directly supported, the code still allows them. Therefore, you
should always issue a TAKE DATA command rather than a simple TAKE command.
•
In a ServerNet Nomadic Disk environment, all data segments must be owned by the
same node. Therefore, whenever a data segment is given away, all data segments
are given away, unless explicit instructions indicate otherwise.
•
In a planned switchover, you should issue the GIVE command on the owning node
before issuing a TAKE command on the destination node. However, a GIVE
command is not strictly necessary and might not always be possible in an emergency
if, for example, the giving node is down. A TAKE command is always necessary,
even if the GIVE command finishes properly.
•
The results of each intermediate step of a TAKE operation are written to the
Nomadic Disk Manager’s outfile. The steps for the TAKE DATA command are:
1. Switch paths to OWNED.
2. UP VOLUMES or UP PATHS, if the UPPATH parameter is used.
Examples
TAKE SEGMENT ONE, ONLY
- 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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