Weblogic Server Availability Monitoring Best Examples
Availability Monitoring:
The following
adverse conditions with the Weblogic environment can cause the Weblogic Servers
to become unavailable.
- Weblogic Server Instance Unavailable
- Weblogic Server Internal Errors
- Critical File Systems Full
- Capacity Limits Reached
- Weblogic Session-Replication Issues
Weblogic Server Instance Unavailable:
Weblogic Server
Instances run as processes on the system. Occasionally they may terminate
abnormally causing Weblogic Server to become unavailable. Partial outages also
exist when Weblogic Server is functioning normally for the currently connected
users but will not allow any new connections. Therefore, Weblogic Server must
be monitored from both the process and connection perspectives.
If an
instance is, down and is 24/ 7, alarm the Weblogic Administrators through email
or SMS.
Weblogic Server Internal Errors:
Weblogic Server
writes internal errors to the Standard Output Log file for the Instance.
Although many of the errors are not critical, all errors should be addressed in
a timely manner. Errors containing critical error codes must be detected and
addressed immediately.
Critical File Systems Full:
One of the most
critical Weblogic Server availability issues occurs when the Weblogic Server is
unable to process transactions because the file system allocated for log space
is full. Log space is used by transactions to store Weblogic Server updates and
it is sized by the Weblogic Administrator according to the number and size of
the transactions for that Serevr. Weblogic Server writes error and dump
information to file systems designated by the Weblogic Administrator. The error
and dump files systems are important because Weblogic Server will not be able
to log critical internal errors when error and dump file systems become full.
Internal errors usually lead to unavailability of the Weblogic Server.
Weblogic Session-Replication Issues:
Weblogic Server has
the capability to replicate all Sessions from one Instance to another. Although
Weblogic Server functions correctly when it is unable to replicate data,
applications using the replicated data may become unavailable. To a user,
application unavailability and database unavailability are the same.