C. System monitoring with HA monitor - high availability system monitoring (operating a clustering system)
HA monitor, high availability system monitoring, is designed to switch systems including server programs (hereafter called "servers"), to improve system reliability and system utilization rates.
HTTP Server can be operated on a clustering system that uses HA monitor. For details on HA monitor, see the manual HA Monitor Cluster Software Guide. For details on how to operate required software (such as the OS) and related programs (such as CGI programs) for HTTP Server in a clustering configuration environment, see the documentation for each program.
HA monitor allows you to operate Web server with minimum outage time of content delivery due to hardware failure and abnormal software stoppage. You can also administrate, maintain, and upgrade software without stopping services.
- Main failures monitored
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Monitored failures (failures detected by HA monitor) can be categorized into two types depending on where they occur: server failures and system failures. "System" here is a general term for the entire system, including hardware required for business processing as well as executed programs and communication devices. The main failures monitored by HA monitor are as follows:
Type of failure
Failure description
Server failure
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Logical error on the server
System failure
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Resource failure (for example, disk device failure)
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Hardware failure in the system, or power down
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Kernel failure
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HA monitor failure
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Monitored path failure
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System slowdown
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