PowerStore: SRM failover test failed with device not found

Summary: SRM failover test failed with device not found

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Symptoms

From the SRM Recovery Report, the errors are highlighted as below:

Failed to recover datastore 'xxxxxxxx'. VMFS volume residing on recovered devices '"a2d686f3-54ca-4db4-ae21-1ab7f156187a". Recovered device 'a2d686f3-54ca-4db4-ae21-1ab7f156187a' not found after HBA rescan

 

Cause

  • SRM failover test creates a snapshot on the DR PowerStore and maps the snapshot to the DR ESXi hosts with the PowerStore automatically generated Host LUN ID (HLU).
  • The PowerStore automatically generated HLU uses N+1 (where N=highest HLU) logic to enumerate LUN IDs (HLU) up to a max HLU 16383 for ESXi.
  • Esxi max HLU =1024 by default
  • If there are many LUNs protected by SRM and multiple failover tests were performed in the past months, the new mapping HLU could reach to 1024+ which results in the ESXi hosts cannot discover the device mapping on the DR ESXi. This may also affect other applications which automatically map snapshots, see PowerStore: Volumes Mapped Through REST API By an Application Are Not Visible on ESXi

 

Resolution

Increase the Disk.MaxLUN to 16383 on all VMware ESXi hosts in the cluster

 

https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.storage.doc/GUID-22710463-E035-4EB9-8FB1-CA12731D43CA.html This hyperlink is taking you to a website outside of Dell Technologies.

 

 

Affected Products

SRM, PowerStoreOS
Article Properties
Article Number: 000223787
Article Type: Solution
Last Modified: 17 May 2024
Version:  3
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