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How to Prove It's a SAN Problem and Not a SQL Tuning Problem.

By Johan van Soest.

Published : 2014-01-29.

Last updated : 2020-10-31.

Microsoft SQL Server 2005 all editions
Microsoft SQL Server 2008 r2 all editions
SQL Server 2012 all editions

Getting Event viewer Application log Informational warnings with Event ID 833 such as:

SQL Server has encountered 5 occurrence(s) of I/O requests taking longer than 15 seconds to complete on file [L:\LOG\ReBaUpFA.ldf] in database [ReBaUpFA] (2). The OS file handle is 0x00000000000006A4. The offset of the latest long I/O is: 0x0000004ca8e800

Have you allready read this Microsoft document "SQL Server logs "Msg 833" when I/O delay problems occur"? Now check this "How to Prove It's a SAN Problem Webcast Video by Brent Ozar (www.brentozar.com)". It also shows you how to use the build in SQL server queries and tooling to build your case.

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