NVP vProxy: Falha nos backups de VM: ocorreu um erro ao salvar o snapshot: Falha em uma operação digest

O NetWorker vProxy é usado para proteger o ambiente vSphere. 
Os backups de máquina virtual (VM) falham intermitentemente com o erro exclusivo "Unable to create snapshot. Não é possível criar um snapshot não desativado após uma nova tentativa: Ocorreu um erro ao salvar o snapshot: Uma operação digest falhou."

O arquivo de VMware.log da VM afetada: 

YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - DIGESTLIB-FILE : DigestLib_FlushMetaDataToDisk: digest header of parent digest has CID 0x31a5ac17 new CID of child digest is 0xb1f97036, parent digest may be corrupt, failing meta-data update on child.
YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - DISKLIB-VMFS  : "/vmfs/volumes/vsan:520220993a84143a-59c06e4db535f859/2504ec67-4847-6d24-2a39-043201a83710/VMNAME01-000001-digest-sesparse.vmdk" : closed.
YYYY-MM-DDTHH:MM:SS Er(02) vcpu-0 - DISKLIB-LIB_CREATE   : DiskLibPostCreateChild: could not init child digest disk: Invalid parameter
YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - DISKLIB-VMFS  : "/vmfs/volumes/vsan:520220993a84143a-59c06e4db535f859/2504ec67-4847-6d24-2a39-043201a83710/VMNAME01-000002-digest-sesparse.vmdk" : closed.
YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - DISKLIB-VMFS  : "vsan://520220993a84143a-59c06e4db535f859/03e5fe67-0e62-18cc-461c-043201a83710" : closed.
YYYY-MM-DDTHH:MM:SS Er(02) vcpu-0 - DISKLIB-LIB_CREATE   : DiskLibCreateChildSparse: Failed in post processing: A digest operation has failed
YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - DISKLIB-VMFS  : "vsan://520220993a84143a-59c06e4db535f859/03e5fe67-0e62-18cc-461c-043201a83710" : open successful (1114113) size = 0, hd = 0. Type 20
YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - DISKLIB-VMFS  : "vsan://520220993a84143a-59c06e4db535f859/03e5fe67-0e62-18cc-461c-043201a83710" : closed.
YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - OBJLIB-VSANOBJ: VsanObjUnlinkInt: Unlinking '/vmfs/volumes/vsan:520220993a84143a-59c06e4db535f859/2504ec67-4847-6d24-2a39-043201a83710' -- 'vsan://520220993a84143a-59c06e4db535f859/03e5fe67-0e62-18cc-461c-043201a83710' (flag: 256).
YYYY-MM-DDTHH:MM:SS148Z In(05) vcpu-0 - DISKLIB-LIB   : DiskLibUnlinkInt: Disk delete successfully completed { result:0, Msg: 'The operation completed successfully', fileName:'/vmfs/volumes/vsan:520220993a84143a-59c06e4db535f859/2504ec67-4847-6d24-2a39-043201a83710/VMNAME01-000002.vmdk'}
YYYY-MM-DDTHH:MM:SS Er(02) vcpu-0 - DISKLIB-LIB_CREATE   : DiskLib_CreateChild: Failed to create child disk: A digest operation has failed
YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - DISKLIB-VMFS  : "/vmfs/volumes/vsan:520220993a84143a-59c06e4db535f859/2504ec67-4847-6d24-2a39-043201a83710/VMNAME01-000002-digest-sesparse.vmdk" : open successful (1114113) size = 0, hd = 0. Type 19
YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - DISKLIB-VMFS  : "/vmfs/volumes/vsan:520220993a84143a-59c06e4db535f859/2504ec67-4847-6d24-2a39-043201a83710/VMNAME01-000002-digest-sesparse.vmdk" : closed.
YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - DISKLIB-LIB   : DiskLibUnlinkInt: Disk delete successfully completed { result:0, Msg: 'The operation completed successfully', fileName:'/vmfs/volumes/vsan:520220993a84143a-59c06e4db535f859/2504ec67-4847-6d24-2a39-043201a83710/VMNAME01-000002-digest.vmdk'}
YYYY-MM-DDTHH:MM:SS Er(02) vcpu-0 - SNAPSHOT: SnapshotBranchDisk: Failed to branch disk: '/vmfs/volumes/vsan:520220993a84143a-59c06e4db535f859/2504ec67-4847-6d24-2a39-043201a83710/VMNAME01-000001.vmdk' -> '/vmfs/volumes/vsan:520220993a84143a-59c06e4db535f859/2504ec67-4847-6d24-2a39-043201a83710/VMNAME01-000002.vmdk' : A digest operation has failed (66)
YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - DISKLIB-VMFS  : "/vmfs/volumes/vsan:520220993a84143a-59c06e4db535f859/2504ec67-4847-6d24-2a39-043201a83710/CAP-HC-CRYSTAL_10-000001-digest-sesparse.vmdk" : closed.
YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - DISKLIB-VMFS  : "vsan://520220993a84143a-59c06e4db535f859/504bee67-f2b3-217e-6646-043201518600" : closed.
YYYY-MM-DDTHH:MM:SS In(05) vcpu-0 - SNAPSHOT: SnapshotBranch failed: A digest operation has failed (5).

O problema foi observado em VMs de clone persistente do Horizon. 
 

Esse problema e sua resolução foram abordados no artigo 373339 da KB da VMware fornecido abaixo. Consulte o artigo da base de conhecimento abaixo para obter instruções de solução temporária.

Não é possível obter snapshots de VMs devido ao erro "An error occurred while taken a snapshot: Uma operação digest falhou."
https://knowledge.broadcom.com/external/article/373339/cannot-take-a-snapshot-with-the-error-a.html

NVP vProxy: Solução de problemas de snapshot do VMware durante backups do NetWorker.