![](/images/backgrounds/286000/hp-serviceguard-metrocluster-users-guide-66984541x1.png)
Table 6 Monitored States and Possible Causes (continued)
Cluster Event (Old state | ||
New state) |
|
|
|
|
|
Unreachable | Cluster nodes were rebooted and the cluster | Network came up and the cluster was |
| started | already running |
|
|
|
Error | Error resolved, cluster is up | Network problem was fixed, cluster is |
|
| up |
NOTE: There is only one condition under which cmclsentryd will determine that the cluster
has Error status: all nodes are unreachable except those which have Serviceguard Error status. (If any nodes are Down or Up, then the cluster status will take one of those values, rather than Error.)
Interpreting the Significance of Cluster Events
Because some cluster events (for example, Up
•Contact with the network provider
•Contact with the administrator of the monitored cluster
•Contact with local cluster administrator
•Contact with company executives
When problematic cluster events persist, obtain as much information as possible, including authorization to recover, if your business practices require this, and then issue the Continentalclusters recovery command, cmrecovercl.
How Notifications Work
A central part of the operation of Continentalclusters is the transmission of notifications following the detection of a cluster event. Notifications occur at specifically coded times, and at two different levels:
•Alert — when a cluster event should be considered noteworthy.
•Alarm — when an event shows evidence of a cluster failure. Notifications are typically sent as:
•Email messages
•SNMP traps
•Text log files
•OPC messages to OpenView IT/Operations
In addition, notifications are sent to the eventlog file located in the /var/opt/resmon/log/
ccdirectory on the system where monitoring is taking place.
NOTE: An email message can be sent to an address supplied by a pager service that will forward the message to a specified pager system. (Contact your pager service provider for more information.)
Alerts
Alerts are intended as informational. Some typical uses of alerts include:
•Notification that a cluster has been halted for a significant amount of time.
•Notification that a cluster has come up after being down or unreachable.
Understanding Continentalclusters Concepts | 41 |