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vSphere High Performance Essentials by Christian Stankowic

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Storage I/O Control

Storage I/O Control (SIOC) is a technology that ensures that all the running workloads on multiple ESXi hosts, using shared storage, achieve the same fair amount of resources. In other words, it makes sure that a VM doesn't affect the performance of other VMs (noisy neighbor scenario), independent of the ESXi host they are running on. To do this, SIOC monitors the average latency and adjusts—if necessary, it also monitors the virtual disk device queues of particular VMs in order to ensure fair resource usage. In combination with disk shares and limitations, priorities can be implemented. SIOC is supported with block-level storage and NFS.

Note

SIOC requires a vSphere Enterprise Edition license.

It is possible to configure SIOC ...

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