HP OpenVMS Systems Documentation

You can customize the SHOW CLUSTER display to include the information most important to your needs by dynamically adding and removing classes and fields. For example, if you add a field that belongs to the CLUSTER class or the LOCAL_PORTS class, SHOW CLUSTER adds the new column of information to the display.

By default, the SHOW CLUSTER display includes the NODE and SOFTWARE fields of the SYSTEMS class and the STATUS field of the MEMBERS class. Figure 22-1 presents a sample customized SHOW CLUSTER display in which the HW_TYPE, VOTES, and TRANSITION_TIME fields have been added to the default SHOW CLUSTER display.

Figure 22-1 Sample SHOW CLUSTER Report

Because SHOW CLUSTER information covers approximately 100 fields of data, the display can quickly extend beyond screen limits. Therefore, the utility provides mechanisms to help you control the display of data. These mechanisms include the following ones:

• SHOW CLUSTER qualifiers
• SHOW CLUSTER commands
• A default keypad, which can be redefined
• An initialization file to format the display
• Command procedures to control the display

SHOW CLUSTER has a number of qualifiers and commands, and a definable keypad that allow you to customize the display. You can rearrange the position of windows, scroll their contents, or change the interval at which the display is updated. This chapter contains reference information for the SHOW CLUSTER qualifiers and commands. Appendix J describes how to use the keypad.

Over time, as you determine the most valuable classes and fields of data for the SHOW CLUSTER report, you can create a startup initialization file that establishes your default report format. You can also build command procedures and define a keypad to use while running SHOW CLUSTER interactively.

By customizing SHOW CLUSTER output, you can display only data that is relevant to your installation. Creating the initialization file SHOW_CLUSTER$INIT:SHOW_CLUSTER.INI is described in OpenVMS System Manager's Manual, Volume 2: Tuning, Monitoring, and Complex Systems.

By customizing the SHOW CLUSTER keypad, you can redefine default keypad functions to be more site specific. Using SHOW CLUSTER keypad commands is described in Appendix J.

22.2 SHOW CLUSTER Usage Summary

The Show Cluster utility (SHOW CLUSTER) monitors the activity and performance of an OpenVMS Cluster system, and outputs the information to your default terminal or to a specified device or file.

Format

SHOW CLUSTER [/qualifier[,...]]

Parameters

None.

Description

To invoke SHOW CLUSTER, enter the following command:

$ SHOW CLUSTER

If you specify the command without any qualifiers, SHOW CLUSTER displays a single cluster report and then returns control to the DCL level. To invoke a continuous SHOW CLUSTER display, enter the following command:

$ SHOW CLUSTER/CONTINUOUS

In a continuous display, you can control report output with SHOW CLUSTER commands. You can direct SHOW CLUSTER output to a file or device other than to SYS$OUTPUT by specifying the /OUTPUT qualifier with the SHOW CLUSTER command.

To exit from a continuous display and return to the DCL level, enter the EXIT command or press Ctrl/Z. To exit from SHOW CLUSTER without erasing the screen, press Ctrl/C. To interrupt SHOW CLUSTER, press Ctrl/Y.

This section describes and provides examples of the SHOW CLUSTER qualifiers. The following table describes the qualifiers:

Specifies the time that the SHOW CLUSTER session is to begin. You can specify an absolute time, a delta time, or a combination of the two. Observe the syntax rules for time values described in the OpenVMS User's Manual.

If you specify a future time, your process is placed in a state of hibernation until the specified time. Use this qualifier with the /OUTPUT and /ENDING qualifiers to run SHOW CLUSTER without direct user intervention.

Format

/BEGINNING =time

Parameter

time

You can specify time as an absolute time expressed as [dd-mmm-yyyy[:]] [hh:mm:ss.cc], or a delta time expressed as [dddd-][hh:mm:ss.cc], or a combination of the two. Observe the syntax rules for time values described in the OpenVMS User's Manual.

Examples

$ SHOW CLUSTER/BEGINNING=31-OCT-2002:20:30
      

In this example, specifying an absolute time, SHOW CLUSTER produces a single display at 8:30 P.M. on October 31, 2002.

$ SHOW CLUSTER/CONTINUOUS/BEGINNING=31-OCT-2002:21:30
      

In this example, specifying an absolute time, SHOW CLUSTER begins a continuous display at 9:30 P.M. on October 31, 2002.

$ SHOW CLUSTER/BEGINNING=7-:30
      

In this example, specifying a delta time, SHOW CLUSTER produces a single display 7 days and 30 minutes from now.

Controls whether SHOW CLUSTER runs as a continuously updating display. If you omit the qualifier, SHOW CLUSTER produces a single display and returns control to the DCL command level.

Running SHOW CLUSTER in the continuous mode allows you to use SHOW CLUSTER commands to control the display.

Format

/CONTINUOUS

Example

$ SHOW CLUSTER/CONTINUOUS
      

In this example, SHOW CLUSTER begins to display a continuous report that is updated every 15 seconds.

Specifies the time that the SHOW CLUSTER session is to end. You can specify an absolute time, a delta time, or a combination of the two. Observe the syntax rules for time values described in the OpenVMS User's Manual.

Use this qualifier with the /BEGINNING and /OUTPUT qualifiers to run SHOW CLUSTER without direct user intervention.

Format

/ENDING =time

Parameter

time

You can specify time as an absolute time expressed as [dd-mmm-yyyy[:]][hh:mm:ss.cc], or a delta time expressed as [dddd-][hh:mm:s.cc], or a combination of the two. Observe the syntax rules for time values described in the OpenVMS User's Manual.

Example

$ SHOW CLUSTER/CONTINUOUS/ENDING=31-OCT-2002:15:30
      

In this example, SHOW CLUSTER begins a continuous display now and ends the display at 3:30 P.M. on October 31, 2002.

Specifies the number of seconds that display information remains on the screen before it is updated. By default, the interval time is 15 seconds.

Format

/INTERVAL =seconds

Parameter

seconds

The number of seconds between display updates.

Example

$ SHOW CLUSTER/INTERVAL=5
      

In this example, SHOW CLUSTER displays a continuous report that is updated every 5 seconds.

Directs the output from SHOW CLUSTER to the specified file instead of the current SYS$OUTPUT device.

SHOW CLUSTER output is always in printable file format, regardless of the file or device type specified. Output can be up to 132 columns wide and can be sent to any file, terminal, or print device.

You can also direct output to a file with the WRITE command.

Format

/OUTPUT =file-spec

Parameter

file-spec

The name of the file or device to which SHOW CLUSTER output is directed. The default file name is SHOW_CLUSTER.LIS.

You can direct output to a device other than SYS$OUTPUT by specifying a valid device name.

Example

$ SHOW CLUSTER/OUTPUT=[OMALLEY]CLUSTER
      

In this example, SHOW CLUSTER produces one report and directs it to the file CLUSTER.LIS;1 in the directory OMALLEY.

Once you start a continuous SHOW CLUSTER display session, you can use SHOW CLUSTER commands to control the session. The following table describes each command:

Executes a command procedure file that contains SHOW CLUSTER commands.

Format

@ file-spec

Parameter

file-spec

Specifies the name of the file that contains the commands to be executed. If you omit the file type, the default file type .COM is used. No wildcard characters are allowed in the file specification.

Qualifiers

None.

Description

The execute procedure (@) command allows you to execute a set of SHOW CLUSTER commands that are contained in a file. For example, a command procedure file might contain a set of commands to customize a SHOW CLUSTER display. You can use any valid SHOW CLUSTER commands in the command procedure. You can nest command procedures up to 16 levels deep.

SHOW CLUSTER looks for the command procedure in the directory specified by the logical name SHOW_CLUSTER$INIT. If SHOW_CLUSTER$INIT is not defined or does not include a directory specification, the utility looks for the command procedure in the current default directory.

Example

COMMAND> @MYFILE
      

This command executes the command procedure MYFILE.COM. Because no file type is specified, the file type defaults to .COM.

Adds all currently enabled CIRCUITS class fields to the SHOW CLUSTER display. The CIRCUITS class contains information about the virtual circuits on systems in the cluster.

Format

ADD CIRCUITS [/qualifier[,...]]

Parameters

None.

Qualifiers

/ALL

Specifies that all fields in this class are to be added to the display.

/TYPE=ALL

Specifies that all types of circuits be included in the display, including formative, open, and closing circuits.

/TYPE=OPEN

/TYPE=NOOPEN

Controls whether either open circuits or nonopen circuits are added to the display.

Description

The ADD CIRCUITS command adds CIRCUITS class information to the SHOW CLUSTER display. This information includes data for all currently enabled fields in the CIRCUITS class. By default, the following fields are enabled:

RPORT_NUM---remote port number
RP_TYPE---remote port type
CIR_STATE---circuit state

For a list of all CIRCUITS class fields, see Table 22-2.

Use the ADD CIRCUITS command together with the REMOVE CIRCUITS command to turn the display of CIRCUITS class information on and off. If you remove the CIRCUITS class from the display and add it again without changing any fields, all of the same fields are displayed again. If, however, you remove the CIRCUITS class and add new CIRCUITS class fields, all previously enabled fields are disabled, and only the newly added fields are displayed.

Examples

COMMAND> ADD CIRCUITS
      

This command adds CIRCUITS class information to the display. This information includes all types of circuits for all enabled CIRCUITS class fields.

COMMAND> ADD CIRCUITS/TYPE=OPEN
      

This command adds all open circuits to the SHOW CLUSTER display.

COMMAND> REMOVE CIRCUITS
COMMAND> ADD RP_OWNER
COMMAND> REMOVE CIRCUITS
   .
   .
   .
COMMAND> ADD CIRCUITS
      

The ADD CIRCUITS command in this example sequence adds CIRCUITS class information to the SHOW CLUSTER display. The REMOVE CIRCUITS command removes the CIRCUITS class from the display.

The ADD RP_OWNER command adds the CIRCUITS class field RP_OWNER to the display. As a result, all other CIRCUITS class fields are disabled. When the CIRCUITS class is removed and added again, only the RP_OWNER field is displayed.

Adds all currently enabled CLUSTER class fields to the SHOW CLUSTER display.

Format

ADD CLUSTER

Parameters

None.

Qualifier

/ALL

Specifies that all fields in this class are to be added to the display.

Description

The ADD CLUSTER command adds CLUSTER class information to the SHOW CLUSTER display. This information includes data for all currently enabled fields in the CLUSTER class. By default, the CLUSTER class includes the following fields:

CL_EXPECTED_VOTES---number of cluster votes expected
CL_QUORUM---cluster quorum
CL_VOTES---cluster votes
QF_VOTE---quorum disk contributes a vote
CL_MEMBERS---current cluster members
FORMED---when quorum was formed
LAST_TRANSITION---last change in cluster membership

For a list of all CLUSTER class fields, see Table 22-3.

Use the ADD CLUSTER command with the REMOVE CLUSTER command to turn the display of CLUSTER class information on and off. If you remove the CLUSTER class from the display and add it again without changing any fields, all of the same fields are displayed again. If, however, you remove the CLUSTER class and add new CLUSTER class fields, all previously enabled fields are disabled, and only the newly added fields are displayed.

Examples

COMMAND> ADD CLUSTER
      

This command adds CLUSTER class information to the display. This information includes all enabled CLUSTER class fields.

COMMAND> REMOVE CLUSTER
COMMAND> ADD CL_QUORUM
COMMAND> REMOVE CLUSTER
   .
   .
   .
COMMAND> ADD CLUSTER
 
      

The ADD CLUSTER command in this example adds CLUSTER class information to the SHOW CLUSTER display. The first command in the sequence removes the CLUSTER class from the display. The second command, ADD CL_QUORUM, adds the CLUSTER class field CL_QUORUM to the display. As a result, all other CLUSTER class fields are disabled. When the CLUSTER class is removed and added again, only the CL_QUORUM field is displayed.