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2V0-620 · Question #148

An administrator needs to verify that vMotion operations can be performed in a vSphere data center. What round trip time (RTT) latency is the maximum value that will allow vMotion operations to succee

The correct answer is B. 100ms RTT. VMware vSphere supports a maximum round-trip time (RTT) latency of 100ms for vMotion operations within a vSphere data center environment.

Section 2 – Administer vSphere Resources

Question

An administrator needs to verify that vMotion operations can be performed in a vSphere data center. What round trip time (RTT) latency is the maximum value that will allow vMotion operations to succeed?

Options

  • A50ms RTT
  • B100ms RTT
  • C150ms RTT
  • D200ms RTT

How the community answered

(25 responses)
  • A
    4% (1)
  • B
    88% (22)
  • C
    8% (2)

Why each option

VMware vSphere supports a maximum round-trip time (RTT) latency of 100ms for vMotion operations within a vSphere data center environment.

A50ms RTT

50ms RTT is well within the supported latency range and vMotion would succeed at this value, but it is not the maximum - it is a lower, more conservative latency that also permits successful migration.

B100ms RTTCorrect

VMware documentation specifies 100ms RTT as the maximum supported network latency for vMotion operations in a data center configuration. Exceeding this threshold causes the memory pre-copy phase to lag behind the VM's dirty page rate, prolonging the quiesce phase and potentially causing the migration to fail or stun the VM for an unacceptably long duration.

C150ms RTT

150ms RTT exceeds the VMware-supported maximum RTT for vMotion in a standard data center and would result in migration timeouts or failures.

D200ms RTT

200ms RTT far exceeds the supported vMotion latency threshold and would prevent successful migration completion.

Concept tested: vMotion maximum supported network round-trip time

Source: https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.vcenterhost.doc/GUID-7DAD15D4-7F41-4913-9F16-567289E22977.html

Topics

#vMotion#network latency#RTT requirements#migration prerequisites

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