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title Monitor Disk Usage | Microsoft Docs
ms.custom
ms.date 03/14/2017
ms.prod sql
ms.prod_service database-engine
ms.reviewer
ms.technology performance
ms.topic conceptual
helpviewer_keywords
database monitoring [SQL Server], disk usage
disks [SQL Server]
monitoring performance [SQL Server], disk usage
server performance [SQL Server], disk usage
monitoring [SQL Server], disk activity
excess paging [SQL Server]
tuning databases [SQL Server], disk usage
I/O [SQL Server], monitoring
disks [SQL Server], monitoring activity
isolating disk activity [SQL Server]
database performance [SQL Server], disk usage
monitoring server performance [SQL Server], disk usage
ms.assetid 1525449c-ea7d-4222-b294-1ba1fe99c9ac
author julieMSFT
ms.author jrasnick

Monitor Disk Usage

[!INCLUDEappliesto-ss-xxxx-xxxx-xxx-md] Microsoft [!INCLUDEssNoVersion] uses Microsoft Windows operating system input/output (I/O) calls to perform read and write operations on your disk. [!INCLUDEssNoVersion] manages when and how disk I/O is performed, but the Windows operating system performs the underlying I/O operations. The I/O subsystem includes the system bus, disk controller cards, disks, tape drives, CD-ROM drive, and many other I/O devices. Disk I/O is frequently the cause of bottlenecks in a system.

Monitoring disk activity involves two areas of focus:

  • Monitoring Disk I/O and Detecting Excess Paging

  • Isolating Disk Activity That [!INCLUDEssNoVersion] Creates

For more information, see Monitoring Disk Usage.

For more information on how to troubleshoot I/O issues in SQL Server, see Slow I/O - SQL Server and disk I/O performance.