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Planning Guide—Dell EMC VxRail 4.x vSAN Stretched Cluster
Executive summary Overview Networking and latency Appendix A
VxRail stretched cluster setup checklist
Appendix B

VxRail stretched cluster setup checklist

VxRail stretched cluster setup checklist

  • Required Reading
    • Read the VMware vSAN Stretched Cluster Guide.
    • Read the VxRail vCenter Server Planning Guide.

    VxRail Version
    • The minimum version is VxRail 3.5.
    • No mixed clusters are supported (that is, VxRail 4.5 and 4.0 in the same cluster).

    vSphere License
    • vSphere Enterprise Plus license is required.
    • You cannot reuse the VxRail vCenter Server license on any other deployments.

    Number of Nodes
    • Review Table 1 in this guide for the minimum number of nodes.
    • The minimum supported configuration is 1+1+1.
    • The maximum supported configuration is 15+15+1 (30 nodes+1 witness).

    Customer-supplied vCenter Server

    (Recommended choice)
    • Required for versions earlier than VxRail 4.5.200.
    • The customer-supplied vCenter Server version must be in the VxRail and external vCenter interoperability matrix.

    Fault Domains

    Must have 3 Fault Domains (preferred, secondary, and witness host).

    Network Topology
    • vSAN traffic between the data sites can be Layer 2 or Layer 3. Ensure that the Witness site in L2 enclosures is using high bandwidth and low latency.
    • vSAN traffic between the witness host and the data sites must be Layer 3.

    Data Site to Data Site Network Latency

    Latency or RTT between data sites should not be greater than 5 msec. (<2.5 msec one-way).

    Data Site to Data Site Bandwidth

    A minimum of 10 Gbps is required.

    Data Site to Witness Network Latency
    • For configurations up to 10+10+1, latency or RTT less than or equal to 200 msec is acceptable, but 100 msec is preferred.
    • For configuration greater than 10+10+1, latency or RTT less than or equal to 100 msec is required.

    Data Site to Witness Network Bandwidth

    The rule of thumb is 2 Mbps for every 1000 objects on vSAN.

    Inter-site MTU consistency

    Required to be consistent between data sites.

    Network Ports

    Review Appendix B for required port connectivity.