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Dell VxRail 7.0 vSAN Stretched Cluster Planning Guide
Executive summary Overview VMware new features Sizing considerations Networking and latency
L2 and L3 support
Witness traffic separation
Supported geographical distances
Bandwidth
Site to witness network latency
Intersite MTU
Connectivity
Appendix A: VxRail stretched cluster setup checklist Appendix B: VxRail stretched cluster open protocol requirements Appendix C: Bandwidth calculation examples

Bandwidth

Bandwidth

  • The bandwidth requirement between the main sites is depends on the workload to be run on vSAN, the amount of data, and the handling of failure scenarios.

    Under normal operating conditions, the basic bandwidth and latency requirements are:

    Table 6.      Inter-Site Bandwidth/Latency

     

    Bandwidth

    Latency

    Site to Site

    Minimum of 10 Gbps

    <5 ms latency RTT

    Site to Witness

    2 Mbps per 1000 vSAN Components

    <100 ms latency RTT (11 to 15 hosts per site)

    <200 ms latency RTT (up to 10 hosts per site)
    <500 ms latency RTT (1 host per site)