Live Merge failed on engine with "still in volume chain", but merge on host was successful

Solution In Progress - Updated -

Issue

  • Snapshot deletion (Live Merge) failed.

  • Disk now in illegal state and no other snapshots can be removed.

  • The snapshot deletion failed with Failed to live merge, still in volume chain.

  • The engine logs contained;

2018-02-27 04:11:46,781Z ERROR [org.ovirt.engine.core.bll.MergeStatusCommand] (pool-6-thread-5) [6620a21c-804e-44a0-bd77-01eaf1453e38] Failed to live merge, still in volume chain: [a6dc1b31-8386-406a-805f-7dc8d44f2cb1, 880b525b-992a-43b7-92a5-3d561244eaa2]

Environment

  • Red Hat Virtualization (RHV) 4.1.9
  • Red Hat Enterprise Linux (RHEL) 7.4 host;
    • vdsm-4.19.43-3.el7

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