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 SQL Server has encountered x occurrence(s) of I/O
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Posting Yak Master

United Kingdom
180 Posts

Posted - 11/07/2013 :  05:06:45  Show Profile  Reply with Quote
I keep seeing the error message SQL Server has encountered x occurrence(s) of I/O requests taking longer than 15 seconds

I also have this message when SQL Server starts A significant part of sql server process memory has been paged out. This may result in a performance degradation.

Could enabling lock pages in memory put less pressure on the disk and hence possibly remove the I/O error messages appearing?

Almighty SQL Goddess

38160 Posts

Posted - 11/07/2013 :  12:18:31  Show Profile  Visit tkizer's Homepage  Reply with Quote
You do need to setup LPIM, but I doubt it's going to resolve such a severe IO issue. Are you drivers and firmware up to date for the entire IO subsystem? That's typically the first place you start. Usually servers are a few revisions behind. If that doesn't work, then you need to get in touch with the disk admins. You could run an ETW trace to figure out where in the stack the issue is. It'll tell you if it's in the OS or past the storport driver. This is complicated stuff and generally requires assistance from Microsoft.

Tara Kizer
SQL Server MVP since 2007
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