When the Tivoli® Storage Manager server initiates an NDMP backup operation on a Celerra data mover, the backup of a large file system might take several hours to complete. Without Celerra integrated checkpoints enabled, any changes occurring on the file system are written to the backup image.
As a result, the backup image includes changes made to the file system during the entire backup operation and is not a true point-in-time image of the file system.
If you are performing NDMP backups of Celerra file servers, you should upgrade the operating system of your data mover to Celerra file server version T5.5.25.1 or later. This version of the operating system allows enablement of integrated checkpoints for all NDMP backup operations from the Celerra Control Workstation. Enabling this feature ensures that NDMP backups represent true point-in-time images of the file system that is being backed up.
Refer to the Celerra file server documentation for instructions on enabling integrated checkpoints during all NDMP backup operations.
If your version of the Celerra file server operating system is earlier than version T5.5.25.1 and if you use NDMP to back up Celerra data movers, you should manually generate a snapshot of the file system using Celerra's command line checkpoint feature and then initiate an NDMP backup of the checkpoint file system rather than the original file system.
Refer to the Celerra file server documentation for instructions on creating and scheduling checkpoints from the Celerra control workstation.