The Disk Queue Length metric counts the average number of system requests that are waiting for disk access on the computer hosting the SQL Server instance. The Disk view on the Resources tab allows you to track your Disk Queue Length, along with other key disk statistics, over a period of time on the computer hosting your SQL Server instance.

Reasons why this metric has no value

SQL Diagnostic Manager is unable to collect the corresponding counter due to one of the following reasons:



SQL Diagnostic Manager for SQL Server performance monitoring, alerting, and diagnostics for SQL Server.
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