How the system log analysis will work(sm21),how the logs
are sended,can anyone explain the behind process.

Answer Posted / ankur

Transaction code SM21 is used to check and analyze system
logs for any critical log entries. The SAP System logs is
the all system errors, warnings, user locks due to failed
log on attempts from known users, and process messages in
the system log.

1. From the initial screen, go to System Log -> Choose ->
All remote system logs. Set the date a day before and click
on Reread system log.

2. In the system log analysis window, you can check/analyze
the critical error message by double clicking to it.

The list can be restricted for Problems Only, Problems and
message and All messages. The information in this list can
further used to analyze the errors which are indicated with
Red sign under Priority. Also we get information of Tcode
that was used by the user when the error got generated.
There are to two different types of logs created by the
system log:

• Local Logs
Each SAP System application server has a local log that
receives all the messages output by this server. The system
log records these messages in a circular file on the server.
When this log file reaches the maximum permissible length,
the system log overwrites it, starting over from the
beginning. (The location of the local log is specified in
the rslg/local/file profile parameter.)

• Central Logs
Each individual application server sends its local log
messages to this server. The server that you designate to
maintain the central log collects the messages from the
other application servers and writes these messages to the
central log. The central log consists of two files: the
active file and the old file. (The location of the active
file is specified in the rslg/central/file profile
parameter; the location of the old file is specified in the
rslg/central/old_file.). The active file contains the
current log. When it reaches the maximum size, the system
performs a “log file switch”. It deletes the old log file,
makes the previously active file the “old” file, and creates
a new active file. The switch occurs when the size of the
active log file is half the value as specified in the
rslg/max_diskspace/central parameter.

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