7.10.6 Changing the settings and operations while HA Monitor and servers are running
HA Monitor provides a command for changing the settings and operations while HA Monitor and servers are running (monchange command). You can use this command to change the settings and operations while HA Monitor and servers are running.
The following table shows the settings and operations that can be changed and the corresponding operands.
|
Setting and operation |
Corresponding operand |
|---|---|
|
Host failure monitoring time |
patrol operand in the HA Monitor environment settings |
|
Server failure monitoring time |
patrol operand in the server environment definition |
|
Program slowdown monitoring interval |
patrol operand in the monitor-mode program environment definition |
|
Temporarily stopping and restarting the monitoring while HA Monitor and servers are running |
|
This subsection explains how to change each setting.
- Important
-
The monchange command, which changes the settings and operations while HA Monitor and servers are running, does not change the HA Monitor and server environment definition settings files. This is a difference from the mondevice command, which reconfigures shared resources while the active server is running. If you restart a host or server after changing its settings, the change reverts to the settings specified in the definition file.
- Organization of this subsection
(1) Changing the host failure monitoring time
You can change the host failure monitoring time specified in the patrol operand in the HA Monitor environment settings. The command for changing the settings and operations while HA Monitor and servers are running (monchange command) can be executed from any host. This command executed on a host can change the host failure monitoring time of all hosts that are connected to that host.
Executing this command on one host will change the host failure monitoring time on all hosts that are connected to that host. If host-to-host communication is disabled during command execution due to a failure on the remote host or a monitoring path failure, the command's processing will be cancelled.
Note the following about changing the host failure monitoring time:
-
Check that all hosts whose host failure monitoring time is to be changed are connected.
-
Do not execute the command from more than one host at the same time.
-
Different host failure monitoring times might be set on hosts in cases such as when a host is restarted after the host failure monitoring time is changed and when a communication failure occurs. If inconsistency in the host failure monitoring time occurs among hosts, re-execute the command for changing the setting and operations while HA Monitor and servers are running (monchange command) so that the hosts share the same host failure monitoring time.
-
If host monitoring history is to be collected and the specified host failure monitoring time is shorter than the time when host monitoring history is to be obtained, no monitoring history is collected.
(2) Changing the server failure monitoring time
You can change the server failure monitoring time specified in the patrol operand in the server environment definition.
When the command for changing the settings and operations while HA Monitor and servers are running (monchange command) is executed, HA Monitor immediately restarts server monitoring with the new server failure monitoring time.
Note the following about changing the server failure monitoring time:
-
The command for changing the settings and operations while HA Monitor and servers are running (monchange command) changes the server failure monitoring time only for the host on which the command is executed. Therefore, you must also execute the command on the host on which the standby server runs.
-
If server monitoring history is to be collected and the specified server failure monitoring time is shorter than the time when server monitoring history is to be obtained, no monitoring history is collected.
(3) Changing the program slowdown monitoring interval (when using the program management function)
You can change the program slowdown monitoring interval specified in the patrol operand in the monitor-mode program environment definition.
When the command for changing the settings and operations while HA Monitor and servers are running (monchange command) is executed, HA Monitor immediately restarts program monitoring with the new program slowdown monitoring interval.
When you change the program slowdown monitoring interval, note the following:
-
The command for changing the settings and operations while HA Monitor and servers are running (monchange command) changes the program slowdown monitoring interval only for the host on which the command is executed. You must also execute the command on the host where the standby server is running.
-
For a multi-process configuration in which multiple programs with the same program alias name are run, change the program slowdown monitoring interval for all processes.
(4) Temporarily stopping and restarting the monitoring while HA Monitor and servers are running
While HA Monitor and servers are running, you can temporarily stop or restart monitoring of a specific function (operand). When the command for changing the settings and operations while HA Monitor and servers are running (monchange command) is executed, HA Monitor immediately performs temporary stop or restart of monitoring.
Monitoring can be temporarily stopped or restarted for the following operands.
- When temporarily stopping or restarting the system disk monitoring:
-
-
disk_ptrl in the HA Monitor environment settings
-
- When temporarily stopping or restarting the server monitoring:
-
- When temporarily stopping or restarting the monitoring of disks for business use on servers:
-
• disk_ptrl in the server environment definition
- When temporarily stopping or restarting the monitoring of servers in the monitor mode
-
• ptrlcmd_ex in the server environment definition
• sby_ptrlcmd_ex in the server environment definition
Note that the monitoring using the patrolcommand operand in the server environment definition cannot be temporarily stopped or restarted.