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Input/Output errors while reseating SAS IOM storage
sled on hardware configurations
Reseating SAS IOM/ storage sled on the following hardware configurations, setup as Failover clusters with shared storage and
multi path enabled, results in IO errors. MX7000 chassis with compute nodes as cluster nodes and MX5016s
sled for shared storage 14G servers as cluster nodes with external Storage enclosures
attached for shared storage
Prerequisites
CAUTION:
1. Take the back up of existing registry , refer https://support.microsoft.com/en-in/help/322756/how-to-
back-up-and-restore-the-registry-in-windows MS link on how to take the registry back-up.
2. Failing to Enable these settings on Dell Servers which are configured for Failover Cluster with Shared
Storage may lead to Cluster Shared Volume to go to failed state.
About this task
Recommended action for Windows Server 2016
Steps
1. Install Windows Update with KB4457127 or a latest Update package on all the nodes that are part of the cluster. Restart
them to have the update enabled on the systems.
2. Create a registry key (Reg_DWORD) with the value "0x1" in the registry path "HKEY_LOCAL_MACHINE\SYSTEM\
CurrentControlSet\Control\StorPort\QoSFlags" on all the cluster nodes. Restart the cluster nodes to enable the registry
key.
Recommended action for Windows Server 2019
3. Create a registry key (Reg_DWORD) with the value "0x1" in the registry path "HKEY_LOCAL_MACHINE\SYSTEM\
CurrentControlSet\Control\StorPort\QoSFlags" on all the cluster nodes. Restart all the cluster nodes to enable the setting.
Next steps
Proceed with the setup as planned post the above enablement. If the issue persists, contact Dell EMC Global Technical Support
for further assistance.
Troubleshooting hardware issues
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