" SQL Server has encountered n occurrence(s) of I/O requests taking longer than 15 seconds to complete on file d:\path\datafile.mdf "
This is SQL's way of saying the I/O Subsystem is not coping with the data throughput.
" When you see this message the first action should still be to have a look at the physical disk counters in sysmon to ensure that the disks are servicing IOs in a reasonable period of time. If those appear to fine then start looking at what filter drivers might be installed on your system, and if there are any known issues with them, or disable them if you don’t need them. "
http://blogs.msdn.com/sqlserverstorageengine/archive/2006/06/21/642314.aspx
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