Each time Adaptive Server starts, it writes information to a local error log file, called the Adaptive Server error log.
$SYBASE/install/errorlog
This file:
Stores information about the success or failure of each start-up attempt.
Logs error and informational messages generated by the server during its operations.
Remains open until you stop the server process.
Contains startup messages from Adaptive Server
When you want to make more disk space available by reducing
the size of the error log, stop Adaptive Server before deleting
logged messages. The log file cannot release its memory space until
Adaptive Server has stopped.