Calculate the NetBackup accelerator track log size
The accelerator track log stores object metadata and file fingerprints in 128-KB segments. The track log is stored on the backup host. The track log size is relative to the size and number of objects being backed up. Track logs are created separately for each policy, backup selection (cloud account and bucket), and stream combination.
The following are only guidelines; requirements in a specific environment may differ. In environments where data changes often, a bigger track log size may be required.
You can use the following formula to calculate the approximate track log size:
Track log Size in Bytes = 2*( (Number of objects * 200) + ((Total used disk space in KiB/128KiB) * 20))
For example: A 1-TB file system with one million objects needs approximately 701-MB track log.
Note that if you modify the backup selection or stream count in an accelerator-enabled policy, NetBackup creates a new track log. The older track logs remain on the backup host.