To increase the number of error logs that are stored by the system, proceed as follows:
1. Expand the SQL Server instance in the SQL Server Management Studio.
2. In Object Explorer, right-click Management, and choose Configure.
The Configure SQL Server Error Logs dialog box appears.
3. Select Limiting the number of the error logs before they are recycled.
4. Enter the number of logs you would like to the system to keep before they are overwritten.