DAR restore go into loop when spanning tapes on large NetApp NDMP backups (4044615)

When restoring large NDMP backups taken on NetApp filer and the backup spans tapes we see restore go into loop loading the same tape trying to restore the data and reloading the same tape again trying again to restore.  When it should be loading the next tape in the backup that contains the remaining data desired for restore.

 “WINDOW length 6458118111232 (0x5dfa5d60000) invalid -- changing to INFINITY” entries are seen inNetVault the log on each attempt to restore

Extract from binary log:

Job Message      2020/05/20 07:37:23     3535               Media   NVserver             (Netapp-cluster-node) Job has been assigned media '007398L7' <NDMP-Group> in 'DRIVE 2:Netapp-filer'

Job Message      2020/05/20 07:38:16     3535               Media   NVserver             (Netapp-cluster-node) Media in 'DRIVE 2:Netapp-filer' assigned to job ready for data transfer

Background        2020/05/20 07:38:16     3535               Media   NVserver             Mover set window: residue  blocks

Warning              2020/05/20 07:38:16     3535               Media   NVserver             NDMP: WARNING 6: MOVER: WINDOW length 6458118111232 (0x5dfa5d60000) invalid -- changing to INFINITY

Information        2020/05/20 07:38:17     3535               Data Plugin         NVserver             Cluster affinity match between volume & device; performing 'local' data transfer.

Information        2020/05/20 07:38:36     3535               Data Plugin         NVserver             NDMP: NORMAL 7: DIRECT ACCESS RECOVERY (DAR) requested

Information        2020/05/20 08:02:01     3535               Data Plugin         NVserver             NDMP: NORMAL 9: MOVER: signaling EOF at 6458118111232 to 10110405181440 on SEEK FSR

Information        2020/05/20 08:02:02     3535               Media   NVserver             (Netapp-cluster-node) Media identified as '007398L7' <NDMP-Group>

Information        2020/05/20 08:02:02     3535               Media   NVserver             (Netapp-cluster-node) Media in 'DRIVE 2:Netapp-filer' with affinity '7807526a-9db2-11e5-b486-63711f743857' ready for data transfer

Warning              2020/05/20 08:02:02     3535               Data Plugin         NVserver             NDMP: WARNING 10: MOVER: WINDOW length 6458118111232 (0x5dfa5d60000) invalid -- changing to INFINITY

Information        2020/05/20 08:20:11     3535               Data Plugin         NVserver             NDMP: NORMAL 12: MOVER: signaling EOF at 6458118111232 to 10110405181440 on SEEK FSR

NetApp bug id  1352800