If the error logs or messages clearly indicate the cause of failure, and you do not believe your databases were damaged, you can attempt to fix the problem and re-run the upgrade immediately.
For example, if the error log indicates that the upgrade failed because your existing databases do not contain enough space, use the alter database command to increase the available space.
Shutting down the server enables the installation program to start the server and re-run the upgrade session.
By default, the log file is located in $SYBASE/$SYBASE_ASE/install/errorlog.