The Databases - SQL I/O Errors alarm is raised when I/O errors are encountered by SQL Server.
When the alarm is raised
- View the Error Log drilldown and look for messages indicating I/O problems. For more information, see SQL Server | Error Log drilldown.
- View the Windows Event Logs and look for messages relating to I/O problems. For more information, see Windows Server | Events Logs drilldown.
The majority of I/O errors reported by SQL Server are caused by hardware failures, such as disk or controller failures.