Network Data Management Protocol restore from a duplicated image exits with status 0, but nothing was restored to the filer.
Details:
The problem occurs when a Media Manager Storage Unit that is configured with Maximum Fragment Size,which is set to a specific value, is used for duplicating Network Data Management Protocol (NDMP) backup images.
NDMP backups are sent to an NDMP Storage Unit. Backups to an NDMP Storage Unit do not fragment images. Duplication (performed manually or through VERITAS NetBackup (tm) Vault) of NDMP backups to a Media Manager Storage Unit with Maximum Fragment Size set to a specific value will cause duplicated images to be fragmented. During the restore from these duplicated images, the NDMP host does not know how to handle the fragmentations introduced by the backup tape manager (bptm) during duplication. The restore will eventually complete with no error, but there will not be any files restored. This is also found to affect the Direct Access Restore (DAR) functionality.
Workaround:
To restore images from such tapes, it is necessary to reduplicate the images to a Media Manager Storage Unit without setting the Maximum Fragment Size. The process will create a new copy with a single fragment image that can be recognized by NDMP hosts.
Solution:
For NDMP duplications, select a Media Manager Storage Unit without setting the Maximum Fragment Size.
NDMP backups are sent to an NDMP Storage Unit. Backups to an NDMP Storage Unit do not fragment images. Duplication (performed manually or through VERITAS NetBackup (tm) Vault) of NDMP backups to a Media Manager Storage Unit with Maximum Fragment Size set to a specific value will cause duplicated images to be fragmented. During the restore from these duplicated images, the NDMP host does not know how to handle the fragmentations introduced by the backup tape manager (bptm) during duplication. The restore will eventually complete with no error, but there will not be any files restored. This is also found to affect the Direct Access Restore (DAR) functionality.
Workaround:
To restore images from such tapes, it is necessary to reduplicate the images to a Media Manager Storage Unit without setting the Maximum Fragment Size. The process will create a new copy with a single fragment image that can be recognized by NDMP hosts.
Solution:
For NDMP duplications, select a Media Manager Storage Unit without setting the Maximum Fragment Size.
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