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Microsoft Windows Server 2019 for Dell EMC PowerEdge Servers Release Notes

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I/O errors or unresponsive virtual machines

Description
This issue occurs on Dell EMC hardware that is configured for failover cluster and has attached shared storage hosting multiple virtual machines with Multipath I/O (MPIO) enabled. If you perform multiple removals and installations of the PowerEdge MX5016s storage expander module, or if you remove and install the PowerEdge MX5000s SAS I/O module, I/O errors occur and the virtual machines goes to unresponsive or failed state. This issue may cause the Cluster Shared Volume to go to failed state.
Fix
  1. Install the latest Service stack updates (SSU) and update the cumulative update from https://support.microsoft.com/en-us/help/4457127 or later.
  2. Create a registry key, Reg_DWORD, with a value 0x1 in the following registry path on all the cluster nodes:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorPort\QoSFlags.

  3. Restart the nodes to enable the registry key.
Affected systems
  • PowerEdge MX7000 chassis with PowerEdge MX740c or PowerEdge MX840c compute nodes and PowerEdge MX5016s storage sleds.
  • Any Rx4x or Tx4x PowerEdge server with external storage array attached.
Tracking number
103498

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