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

  • 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 (". It also shows you how to use the build in SQL server queries and tooling to build your case.
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