Niko Neugebauer • 5/25/2020

Resouce Governor IOPS_PER_VOLUME is not enough

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This technical article critiques SQL Server's Resource Governor, specifically the IOPS_PER_VOLUME control introduced in 2014. It argues this feature is insufficient for modern, complex storage configurations, such as Azure VMs with multiple volumes (P40 drives) for data, logs, and TempDB. The author explains how varying I/O block sizes (from 512 bytes to 8MB) and different workload types make simple IOPS-per-volume throttling inadequate for preventing performance issues and VM-level throttling ('Cluster Shakes').

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#performance #storage #SQL Server
Resouce Governor IOPS_PER_VOLUME is not enough

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