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Dell VxRail Architecture Overview

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Recommendations and restrictions

When you deploy a VxRail 2-node cluster with VMware vSAN, use SolVe for VxRail to upgrade the cluster. If a 2-node cluster is connected to a switch (not direct-connect), it can be converted to a VxRail vSAN cluster (three nodes).

Recommendations

To adequately size the cluster, consider the following recommendations:

  • During deployment, you can select the appropriate size from the deployment drop-down menu for a witness appliance:
    • Tiny
    • Normal (recommended)
    • Large
    • Extra large
    Each option has different requirements for compute, memory, and storage. For 2-node clusters with up to 25 VMs, consider a tiny size witness appliance because they may not reach or exceed 750 components.
  • Each storage object is deployed on VMware vSAN as a RAID tree, and each leaf of the tree is a component. For instance, when VMDK with a RAID 1 mirror is deployed, there is a replica component in one host and another replica component in another host. The number of stripes that are used has an impact. For example, if two stripes are used, there are two replica components in each host.

The following restrictions apply for 2-node clusters:

  • VMware VDS: VxRail versions earlier than 7.0.010 support VxRail-managed VMware VDS (which requires four ports).
  • VxRail 7.0.010 and later versions support VxRail-managed VMware VDS and customer-managed VMware VDS (requires four ports).
  • 2-node clusters do not support:
    • Expansion to more than two nodes before VxRail 7.0.130.
    • RAID 5/6 erasure coding

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