vSAN Network Design


A highly available and scalable storage infrastructure may be built using VMware vSAN, a software-defined storage solution that enables organisations to pool storage capacity across numerous servers and discs. This architecture’s vSAN network design is crucial because it establishes the basis for communication between vSAN hosts and guarantees the performance and stability of the storage system.

Introduction to vSAN Network Design:

The management network and the vSAN network are the two fundamental parts of the vSAN network architecture. The vSAN network is used for vSAN data traffic, whereas the management network is utilised for vSphere management traffic.

A dedicated physical network, a convergent network, or a virtual network can all be used to configure the vSAN network. When constructing the vSAN network, it is crucial to take into account elements like network speed, latency, and dependability since each strategy has pros and downsides.

Network Requirements for vSAN:

The vSAN network must adhere to specific standards in order to guarantee top performance and dependability.

These consist of:

  • enough network capacity to accommodate vSAN traffic
  • Reduced network latency to speed up data transfer
  • high network dependability to guarantee ongoing data availability
  • Prioritising vSAN traffic over other network traffic through the use of network quality of service (QoS)

Various network design factors, such as network topology, network adapters, network switches, and network protocols, can be used to meet these needs.

Topology Design Considerations

The vSAN network’s structure plays a key role in guaranteeing maximum performance and dependability. Depending on the scale and complexity of the environment, several topologies may be developed.

Small environments could just need a straightforward two-switch layout, but bigger environments might need a more intricate spine-leaf structure.

Between switches and hosts, there must be enough network capacity, and redundant network pathways and link aggregation must be used to provide network redundancy.

Network Adapter Design Considerations:

Performance and dependability in the vSAN network can be significantly impacted by the network adapters being utilised. To minimise CPU overhead and cut down on latency, it’s critical to use network adapters that offer capabilities like hardware offloading and RDMA (Remote Direct Memory Access).

The amount of network adapters per host, the utilisation of NIC teaming, and the choice between using dedicated vs. shared network adapters for vSAN traffic are all significant factors as well.

Network Switch Design Considerations:

The network switches used in the vSAN network must be able to deliver enough network bandwidth, with little latency, and with a high degree of dependability. Choosing switches that handle functions like Quality of Service (QoS), jumbo frames, and multicast traffic is crucial.

The needed number of switches, the usage of redundant switches, and the use of switch stacking or fabric extenders to facilitate network management are further crucial factors.

Network Protocol Design Considerations:

TCP/IP, UDP/IP, and Multicast are only a few of the network protocols used by the vSAN network. In order to guarantee top performance and dependability, it is crucial to establish these protocols correctly.

Using Jumbo Frames as an example, which use fewer network packets to send data, can enhance network performance. By minimising network traffic, properly configuring Multicast traffic can also enhance vSAN performance.


A crucial part of a vSAN deployment is the architecture of the vSAN network, and while constructing the network, it’s crucial to take aspects like network speed, latency, and reliability into account. Organizations may guarantee the highest level of performance and dependability for their vSAN storage infrastructure by adhering to the recommendations provided in the vSAN network design guide.

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