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The Disk Queue length , in itself , cannot full explain the underlying I/O subsystem delays , but is a good indicator that disk bottleneck is occurring.
PhysicalDisk: Current Disk Queue Length measures how many requests are waiting for disk access. In conjunction with PhysicalDisk: % Disk Time , which checks the percentage of time the disk spends in readwrite. Sustained high values are a strong indicator that I/O problems exist.
From the SQL server perspective , it can be involved to gauge in detail which file(s) could be experiencing the issue. The sys.dm_io_virtual_file_stats view returns I/O Statistics for data/log files per file , and is useful in breaking down transaction i/o rates per file.
Read more on : SQL Server measure transaction rates and sys.dm_io_virtual_file_stats
Related :IO Requests taking longer than 15 seconds to complete
Source:Jack Vamvas (http://www.sqlserver-dba.com)
Author: Jack Vamvas (http://www.sqlserver-dba.com)
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