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Which feature is enabled?

An engineer needs to configure a VMware host. According to best practice, the engineer needs to enable a
feature by changing the variables QFullSampleSize and QFullThreshold. The engineer sets those two
parameters to the value of 0 in VMware ESXi 5.1 Patch 1 and later versions.
Which feature is enabled?

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Adaptive queue depth

Enhanced Transmission Selection (ETS)

Asymmetric logical unit access (ALUA)

Priority Flow Control (PFC)


At times of high congestion, VMware has an adaptive queue depth algorithm that can be enabled with the
QFullSampleSize and QFullThreshold variables. These variables aid in relieving the congestion by dynamically
reducing and increasing the LUN queue depth. Due to the architecture of SC Series storage, enabling these
settings is not recommended unless under the guidance of Dell Copilot Support or Dell Support

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