Storage Spaces Direct (S2D) QoS

ppinfrageek 121 Reputation points
2024-05-09T16:04:13.9133333+00:00

I've been asked to build an S2D hyper-converged cluster where the hardware has already been provided - 4x Dell PowerEdge R740xd servers.

Each server has the following cards:

  • 2x Broadcom NetXtreme E Dual-port 25Gb Ethernet PCIe Adapter
  • 2x Mellanox ConnectX-6 Single-port 100Gb Adapter

I have been asked to create:

  • a SET team (2x 25Gb ports) which will be used for management and live-migration traffic
  • another SET team (2x 25Gb ports) which will be used for VM transactional traffic
  • This leaves the Mellanox cards which will not be teamed but will each be configured with a different layer 2 VLAN where both will be used for storage traffic.

Since the types of traffic are segregated, is there any need to configure any QoS for traffic classes?

I would have preferred to use far fewer ports per server because this is overkill for what is needed but these decisions have been made already.

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  1. Ian Xue (Shanghai Wicresoft Co., Ltd.) 31,091 Reputation points Microsoft Vendor
    2024-05-13T04:34:52.16+00:00

    Hi ppinfrageek,

    Hope you're doing well.

    1. Since you have segregated different types of traffic onto different network adapters and VLANs, there is already a degree of isolation between the traffic types. This reduces the likelihood of congestion or contention between them.
    2. The network adapters you mentioned, particularly the Mellanox ConnectX-6 Single-port 100Gb Adapter, provide high bandwidth capabilities. With such high throughput available, the likelihood of congestion is reduced, especially when each traffic type has its dedicated network adapters.
    3. QoS is typically implemented to prioritize certain types of traffic over others in cases where there is contention for network resources. In your scenario, with segregated traffic types and ample bandwidth, there may not be significant contention to warrant QoS.

    In summary, while it may not be strictly necessary given the segregation and high bandwidth available, implementing QoS can provide an additional layer of control and assurance for network traffic prioritization, especially in environments with diverse workloads and varying performance requirements.

    Best Regards,

    Ian Xue


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