1.3 ITSLM system configuration
ITSLM consists of ITSLM - UR, which collects HTTP packets exchanged between service providing servers and users, and ITSLM - Manager, which monitors the service status based on the HTTP packets collected by ITSLM - UR.
A system configuration intended mainly for monitoring service status (service performance) is called a service monitoring configuration. The service monitoring configurations include a configuration for monitoring only service performance and a configuration for monitoring both service performance and system performance by linking ITSLM with Performance Management.
The following figure shows the system configuration for using ITSLM to monitor service performance only.
|
|
![[Figure]](GRAPHICS/ZU010500.GIF)
Of the components shown in the figure, the roles of those that require explanation are described below.
- ITSLM - Manager
-
Aggregates and analyzes the HTTP packets collected by ITSLM - UR and monitors the service status. The monitoring results can be displayed on the monitoring person's computer. They can also be saved to a file and used for creating reports.
Multiple ITSLM - URs can be connected to a single ITSLM - Manager.
- ITSLM - UR
-
Collects HTTP packets of requests and responses that are exchanged between service users and service providing servers via switches. An ITSLM - UR is provided for each switch.
A single ITSLM - UR can monitor multiple services.
To reduce the network load, we recommend that you provide separate interfaces to connect to switches and to ITSLM - Manager, as shown in the system configuration here.
- Notes
-
-
ITSLM - UR uses two ports, one for monitoring services and one for communicating with ITSLM - Manager. If the mirrored ports do not support TCP/IP communications due to switch specifications, the port for monitoring services cannot be shared for communicating with ITSLM - Manager. In such a case, provide separate network interface cards, one for connecting switches and one for connecting ITSLM - Manager.
-
If a load balancing device is used, the range monitored by an ITSLM - UR depends on its location within the system configuration. ITSLM placed outside the load balancing device monitors the services distributed by the load balancing device as a single service. ITSLM - UR placed inside the load balancing device within the system configuration monitors the services distributed by the load balancing device as separate services. The following figure shows the placement of ITSLM - UR and its monitoring range when a load balancing device is used.
Figure 1‒11: Placement of ITSLM - UR and its monitoring range when a load balancing device is used ![[Figure]](GRAPHICS/ZU010600.GIF)
-
- JP1/Base
-
Manages the users (JP1 users) who access ITSLM - Manager as the authentication server and performs monitoring.
- Switch
-
This is a network switch placed between external and internal networks. This network switch must have a port mirroring function.
If you link ITSLM with Performance Management to monitor system performance and availability, you must have Performance Management-related products.
The following shows an example of a system configuration when ITSLM is linked with Performance Management.
|
|
![[Figure]](GRAPHICS/ZU010610.GIF)
Of the components shown in the figure, the roles of the Performance Management products are explained below.
- PFM - Base
-
Sends the data collected by PFM - Agent, PFM - Agent for Service Response, or PFM - RM to PFM - Manager and ITSLM - Manager.
- PFM - Manager
-
Sends configuration information to ITSLM - Manager as requested by ITSLM - Manager. PFM - Manager also provides the functions of PFM - Base. If PFM - Agent, PFM - Agent for Service Response, and/or PFM - RM are running on the same host, data collected by these products is sent to ITSLM - Manager.
- PFM - Agent
-
Provides functionality as a monitoring agent and monitors the system performance of a monitored host. PFM - Agent is installed on the monitored host.
- PFM - RM
-
Provides functionality as monitoring agent and monitors the system performance of a monitored host. PFM - RM is installed on a host that is not the monitored host.
- PFM - Agent for Service Response
-
Provides functionality as a monitoring agent and collects operation data required for monitoring the availability of a monitored host.
- PFM - Web Console
-
Provides windows for researching detailed system performance by using the Performance Management functions. When a warning sign of an error in monitored services is detected and the host in question is identified, PFM - Web Console is started from an ITSLM window.
A system configuration intended mainly for monitoring system performance is called a system monitoring configuration. Such a configuration is used to monitor system performance only. The following figure shows an example of a system monitoring configuration.
|
|
![[Figure]](GRAPHICS/ZU010620.GIF)
ITSLM - Manager and ITSLM - UR can be run in cluster systems. For the system configuration and components required when ITSLM - UR is run in a cluster system, see 6.1.2 ITSLM system configuration in a cluster system.