Software reliability 103
MONIT is an open source package used for monitoring the important daemon services automatically initiated at startup. If a malfunction occurs, MONIT provides actions such as alert, start, stop, and restart. To provide these actions, applications must be registered with MONIT, and the appropriate actions for each application must be specified.
The following system parameters are monitored: memory, CPU, and device space usage. If usage of one of them passes a warning threshold then a message is displayed. The warning and critical thresholds are shown in Table 2 "Warning and Critical thresholds" (page 103).
Table 2
Warning and Critical thresholds
System | Warning Clear | Warning Set | Critical Clear | Critical Set | |
Resource |
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Memory usage | - | - | 90% | 95% | |
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CPU usage | - | - | 90% | 95% | |
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/boot (/dev/sda1) |
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Size: 100 MB. | 70% | 75% | 80% | 85% | |
Critical. |
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admin (/dev/sda2) | 80% | 85% | 85% | 90% | |
Size: 4 GB. | |||||
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/ (/dev/sda6) | 80% | 85% | 85% | 90% | |
Size: 4 GB. |
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/opt (/dev/sda7) |
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Size: 8 GB. | 80% | 85% | 90% | 95% | |
Not critical. |
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/home (/dev/sda8 |
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) Size: 4 GB. | 80% | 85% | 90% | 95% | |
Not critical. |
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/tmp (/dev/sda9) |
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Size: 20 GB. | 80% | 85% | 85% | 90% | |
Critical. |
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/var (/dev/sda10) |
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Size: 30 GB. | 80% | 85% | 85% | 90% | |
Critical. |
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An example of a Critical Set alarm is shown at Figure 101 "Critical Set alarm example" (page 104). An example of a Critical Clear alarm message is shown at Figure 102 "Critical Clear alarm example" (page 104).
Note: If critical alarms persist, contact your Nortel technical support.
Nortel Communication Server 1000
Linux Platform Base and Applications Installation and Commissioning
29 October 2008
