Error Message

Type:  Information

Event ID:  833

Event Source: MSSQLSERVER

SQL Server has encountered %n occurrence(s) of I/O requests taking longer than 15 seconds to complete on file
 

This problem can happen due to hardware errors, disk driver or filter driver, system performance, anti virus program scanning SQL data files.

This message can also get logged during disk intensive operations running on the system. For example backup, SQL maintenance activity or too many read/write SQL  I/O which the I/O  subsystem cannot process withing the specific time interval.

1. Check system event and application events for any disk related or driver related errors.

2. Check if this messsage is logged during backups, SQL  maintenance  window or any other disk intensive operations.

3. Use perfmon to monitor following counters.

a:  Average Disk Sec/Transfer

b:  Average Disk Queue Length

c:  Current Disk Queue Length