1.4 Single-manager configuration and master/slave configuration of SLM - Manager

You can select either a single-manager configuration or a master/slave configuration for SLM - Manager. Both of these configurations are described below.

• Single-manager configuration

  A configuration where SLM - Manager is operated from a single device.

• Master/slave configuration

  A configuration where SLM - Manager is operated across multiple devices. Instances of SLM - Manager are run in parallel, with the load distributed among them. This increases the maximum number of items that can be monitored.

  The following figure illustrates the load distribution among SLM - Manager instances.

  Figure 1‒14: Load distribution among SLM - Manager instances

  Of the elements shown in the figure, the roles of the notable elements will be explained.

  SLM - Manager (Master) (master instance of SLM - Manager)

  The instances of SLM - Manager across multiple devices are controlled by using a master/slave configuration. Various requests, such as those for analysis of performance information sent from PFM - Base, are output to the instances of SLM - Manager that are subject to control, and responses are received as necessary.

  Link PFM - Manager with the master instance of SLM - Manager. SLM - Manager links with PFM - Manager from a single device, in the same manner as in the single-manager configuration.

  SLM - Manager (Slave) (slave instance of SLM - Manager)

  Receives requests from the master instance of SLM - Manager, and returns the appropriate responses.

  A maximum of 19 devices that have slave instances of SLM - Manager can link with the master instance of SLM - Manager.

For details about changing the configuration of SLM - Manager, see 8.4 Changing the configuration of SLM - Manager.

Important

With the master/slave configuration, refrain from registering monitored services with the same service group name or same service name. Monitored services with the same name cannot be distinguished from each other on the screen.

Note

Because the master instance of SLM - Manager must link with the slave instances of SLM - Manager, the master will be subject to a greater monitoring load than the load when SLM - Manager is in the single-manager configuration, and performance might be worse in comparison. When the number of monitored items is such that the items can be sufficiently monitored by using only a single instance of SLM - Manager, we recommend running SLM - Manager in the single-manager configuration.

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