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OpenStack Nova Fails to Attach NetApp iSCSI LUNs After Volume Migration

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openstack
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virt
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Applies to

  • OpenStack (Cinder, Nova)
  • iSCSI
  • ONTAP 9

Issue

  • When moving a Cinder volume (backed by a NetApp iSCSI LUN) from one VM to another, the VM fails to boot because the LUN is not remapped as expected.
  • Nova reports the LUN as in-use, while Cinder marks it as available.
  • The host does not see the device, and the following error is observed in the Nova logs:

ERROR nova.virt.block_device [...] Driver failed to attach volume <UUID> at /dev/sdp: os_brick.exception.VolumeDeviceNotFound: Volume device not found at.

  • The issue only occurs during LUN handover between VMs.
  • Single VM/single volume scenarios work as expected.

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