VM Fails to Start with 'Volume device not found at' Error

Problem

• VM fails to start with below error:

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2023-05-26 04:58:46.360 ERROR nova.compute.manager [req-21a1e9fe-171d-4ba1-8147-1c46f1317240 [e-mail] c4d] [instance: 8b3a0948-xxxx-4f6d-xxxx-54ae0c26cd67] Cannot reboot instance: Volume device not found at .: os_brick.exception.VolumeDeviceNotFound: Volume device not found at.

Environment

• Platform9 Managed OpenStack - v5.4.0 and Higher

• Volumes configured with iSCSI.

Cause

The mentioned volume is not mounted on the host where the VM is running.

Resolution

• Mount the volume on the host using below commands:

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# iscsiadm --mode discoverydb --type sendtargets --portal <TARGET> --discover|grep <volume_id>
# iscsiadm --mode node --targetname <volume_iqn> --portal <TARGET>:3260 --login