In Object Explorer, expand the instance of SQL Server, expand Management, right-click SQL Server Logs, and then click Configure.
In the Configure SQL Server Error Logs dialog box, choose from the following options.
Limit the number of the error log files before they are recycled
Check to limit the number of error logs created before they are recycled. A new error log is created each time an instance of SQL Server is started. SQL Server retains backups of the previous six logs, unless you check this option, and specify a different maximum number of error log files below.
Maximum number of error log files
Specify the maximum number of error log files created before they are recycled. The default is 6, which is the number of previous backup logs SQL Server retains before recycling them.