Hyper-V backup failing after 9.2.1.3 upgrade

Hello everyone,

I have upgraded a NW 9.1.1.1 Linux Server to 9.2.1.3. It's been "ok" so far. We upgraded the server and Storage Nodes, and all backup jobs ran well during the night. However, the next day we upgraded the client agent for all 4 nodes in a Hyper-V cluster. And now it fails completely. It used to back up 71 VMs with no issue, however, now it fails if I try to backup more than 1 VM at the same time.

NMC says the following:

7/09/2018 09:02:35 PM jobhandler(306): Created Job ID: 582002\n Save command: nsrnmmsv.exe -s nwserver -g Hyper-V/HyperV_Diario/Backup_HV_Diario/Hyper-V -m cluster001 -b dd2500_2_disk -l full -y "Thu Aug 09 23:59:59 GMT+0200 2018" -Z cluster001 -A *NSR_BACKUP_GENERATIONID=1531162917 -A NSR_APP_TYPE= -A NSR_CSV_SNAPSHOT_SYMLINK=Yes -A NSR_DISABLE_INCREMENTAL=yes -A NSR_FEDERATED_BACKUP=yes -A NSR_FEDERATED_TYPE=csv -A NSR_FED_SECONDARY=yes -A NSR_FED_SNAPSHOT=Yes -A NSR_MOVE_CSV_OWNERSHIP=yes -A NSR_PARTIAL_BACKUP=yes -A NSR_PS_DEBUG_LEV

07/09/2018 09:49:44 PM Secondary backup with job id (582002) failed on host 'cluster001-node001'

07/09/2018 09:49:44 PM Snapshot creation job failed, Stopping federated backup one of the 'secondary' backup failed .

07/09/2018 09:49:44 PM Snapshot creation failed for Hyper-V CSV federated.

07/09/2018 09:49:44 PM Snapshot creation failed for Hyper-V CSV federated.

07/09/2018 09:49:44 PM Hyper-V CSV backup failed

07/09/2018 09:49:44 PM Hyper-V CSV backup failed

07/09/2018 09:49:49 PM The backup operation did not complete successfully.

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                                 SUMMARY                                   

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Savesets requested from NMC for backup = 3

APPLICATIONS:\Microsoft Hyper-V\VM1

APPLICATIONS:\Microsoft Hyper-V\VM2

APPLICATIONS:\Microsoft Hyper-V\VM3

Savesets included for backup = 3

APPLICATIONS:\Microsoft Hyper-V\VM1

APPLICATIONS:\Microsoft Hyper-V\VM2

APPLICATIONS:\Microsoft Hyper-V\VM3

Savesets Succeeded = 0

Savesets Failed = 3

APPLICATIONS:\Microsoft Hyper-V\VM1, - Reason: Failed in saveset snapshot

APPLICATIONS:\Microsoft Hyper-V\VM2, - Reason: Failed in saveset snapshot

APPLICATIONS:\Microsoft Hyper-V\VM3, - Reason: Failed in saveset snapshot

===============================SUMMARY END================================

07/09/2018 09:49:49 PM Exiting with failure.

07/09/2018 09:49:49 PM Removing files under temp path C:\Program Files\EMC NetWorker\nsr\tmp\nmm\2018-07-09_21-01-56_16008-5824.

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This is what nsrnmmsv.raw says:

NSR critical Failed to retrieve parent ID information for the virtual disk. The state is invalid.

Do you think I should roll back the agents to a previous version?

Kind regards