HP Data Protector Software Performance White Paper

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the first tree walk of UNIX file systems is disabled and POSIX hard links are backed up as files.
Figure 31 illustrates the correct configuration for disabling the tree walk.
Figure 31. Disabling the first tree walk for UNIX file systems – Backup POSIX hard links as files
Data Protector IDB considerations
Note: The IDB logging level was not changed from its default value of “Log All”. This logging
level is the worst case for the IDB while each file is tracked. See the section IDB logging level
on
page 54 for further details.
The tests in the following section showed that more tape space was consumed for small files
than for typical files. The backup of 5,535,750 small files and 249.36 GB total volume resulted in
267.32 GB tape space usage. The overhead was caused by the high number of small files and
the required catalog information for each single file written to tape (its file name and attributes).