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Oracle VM Windows Guests I/O Slow - Performance Issue (Doc ID 1086314.1)

Last updated on JANUARY 31, 2019

Applies to:

Oracle VM - Version 2.1 and later
Oracle Cloud Infrastructure - Version N/A and later
Generic Windows


On one or more Windows virtual machines (guests), I/O performance / throughput is extremely low. Checking the DMA mode for storage I/O shows PIO instead of preferred (high performance) Multi-Word DMA Mode 2.


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