RDMA disconnects in a switchless storage network topology

Summary: RDMA disconnects in a switchless storage network topology

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Symptoms


Observations

In an Azure Stack HCI using switchless storage network toplogy, when the cable is disconnected and reconnected, most of the time, RDMA sessions immediately get established in 1 direction and may be slow (up to a day) to come up for the other direction. However, sometimes, RDMA sessions may not get established in either direction.

 

Impact and Resolution

Cluster storage networks fall back on to TCP for all communication and it may impact performance if RDMA does not get established automatically.

 

To reestablish RDMA sessions, you can manually disable and re-enable the adapters using PowerShell

Disable-NetAdapter -Name 'Storage Adapter Name'

Enable-NetAdapter -Name 'Storage Adapter Name'

Cause

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Resolution

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Affected Products

Storage Spaces Direct R440 Ready Node, Storage Spaces Direct R640 Ready Node, Storage Spaces Direct R740xd Ready Node, Storage Spaces Direct R740xd2 Ready node
Article Properties
Article Number: 000133598
Article Type: Solution
Last Modified: 20 Oct 2025
Version:  5
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