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Jack Vamvas's Blog

SQL Server Async_io_completion and how to reduce it

Mar 24 2011 7:41AM by Jack Vamvas   

SQL Server Books online defines Async_io_completion as “Occurs when a task is waiting for I/Os to finish “

Mainly a symptom of an IO bottleneck. Cross check by identifying other wait stat indicators such as: IO_COMPLETION, WRITELOG,PAGEIOLATCH_X. The appearance of at least one of these along with ASYNC_IO_COMPLETION – near the top of the wait stats indicates a serious IO bottleneck.

Any SQL Server task waits for IO completion – this is completely normal part of SQL Server processing. But when the wait for IO completion is slow there is a problem.

A few issues to consider and approached to minimizing Async_io_completion.

1) Maintain Random access \ Sequential access files on different drives .

2) Are you experiencing IO delay messages in the error logs. This is a strong indicator, as it reports on IO delays – outside of the SQL Server process space.

the article: IO Requests taking longer than 15 seconds to complete gives an in depth explanation

3) Analyse the SQL Server Performance Stack

CPU Cores


SQL Server



Fibre Channel Switch

Storage Controller

Storage Controller Cache



Republished from

Republished from SQL Server DBA [65 clicks].  Read the original version here [32134 clicks].

Jack Vamvas
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