HP Data Protector Software Performance White Paper

Figure 41 demonstrates how efficiently the File System Change Log Provider option performs.

Best results can be achieved if file systems have few changes, like in this chart shown with 1%

incremental backup.

Figure 41. Dependencies of Change Log Provider and Enhanced Incremental Database (EIDB)

Updating the Enhanced Incremental Database (EIDB) has a large performance impact. The

current default configuration is to update the EIDB if it exists for the volume in question (this will

change in the near future). The Change Log Provider does not depend on the EIDB, but

updates it so that it can be used in case of a Change Log Provider error. In other words, if the

EIDB is kept up-to-date, it can be used in order to provide the enhanced incremental

functionality in the case of a Change Log Provider error.

The Change Log Provider performance can be improved by:

1. Deleting the EIDB for the volume in question. If it is not there, it will not be updated.

2. Setting a parameter in the Data Protector template Data_Protector_home\omnirc:

DP 6.1: OB2_CLP_UPDATE_EI_REPOSITORY =0