Table of Contents
Question
A VxRail Stretched cluster deployment with eight nodes at each data site is being proposed. What is the latency requirement between each data site and the Witness site?
A. Less than 5 ms
B. Less than 10 ms
C. Less than 100 ms
D. Less than 200 ms
Answer
C. Less than 100 ms
Explanation
The correct answer is C. Less than 100 ms.
A VxRail Stretched cluster is a deployment model in which two or more virtualization host servers are part of the same logical cluster but are in separate geographical locations. The vSAN stretched cluster feature enables synchronous I/O of data between sites, allowing for an entire site failure to be tolerated.
To ensure data consistency and availability, a VxRail Stretched cluster requires a third site that hosts a Witness appliance, which acts as a tie-breaker in case of a network partition between the data sites. The Witness appliance does not store any data, but only metadata about the state of the cluster.
The latency requirement between each data site and the Witness site is less than 100 ms . This is because the Witness appliance needs to communicate with the vSAN cluster nodes to monitor their health and availability, and to arbitrate ownership of data objects in case of a failure or network partition. If the latency is too high, the Witness appliance may not be able to perform these functions effectively, resulting in data loss or unavailability.
Therefore, when planning for a VxRail Stretched cluster deployment, it is important to consider the network latency between each data site and the Witness site, and ensure that it meets the requirement of less than 100 ms .
Reference
- Dell EMC VxRail 7.0 vSAN Stretched Cluster Planning Guide (delltechnologies.com)
- VxRail Stretched Cluster Requirements (vmware.com)
- VxRail stretched cluster physical network planning | Planning Guide—VMware Cloud Foundation 3.x on VxRail | Dell Technologies Info Hub
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