When it comes to SQL Server performance, disk I/O is often one of the most critical and overlooked components. While CPU and memory get much of the spotlight, the underlying storage subsystem plays a foundational role in how efficiently SQL Server can read and write data. Slow or misconfigured disk I/O can lead to query bottlenecks, long transaction times, and degraded user experience—especially under heavy workloads.
This guide helps DBAs understand how SQL Server interacts with storage, how to monitor disk I/O, and how to optimize it for better performance. From key metrics to practical tuning tips, you will gain the insights needed to keep your SQL Server running smoothly at the storage layer.
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