_dirdesc files in the DS-System Online Storage


Creation Date: February 13, 2009
Revision Date: October 12, 2011
Product: DS-System

Summary

NOTE: If the DS-System Advanced Configuration contains the "DirStoreSafeMode" parameter, it means _dirdesc files are no longer used as the primary source for backup set directory descriptor information. Instead, that information is being consolidated to one "_dir_store" file per backup set (to improve I/O performance). For more details, see the Knowledge Base article "_dir_store files in the DS-System Online Storage".

The "_dirdesc" files are created by the DS-System on the Online Storage. These files hold metadata for the backed up data in the corresponding folder where they appear.

Details

There are three levels of _dirdesc files for the DS-System:
backup set level
The backup set level _dirdesc files contain information about the backup set that can be displayed by the DS-Operator (e.g. backup set name, backup set type, statistics, etc.).
share level
The share level _dirdesc files contain information about the share like the share name (e.g. C$).
directory level
The directory level _dirdesc files contain information about the directory (e.g. directory name, directory type, statistics, etc.).

DS-System verifies a _dirdesc file's validity every time it is accessed. Each _dirdesc file contains a file signature and when the file is opened, the DS-System calculates the file signature and compares it to the one that it is stored inside the file. If a _dirdesc file is found to be corrupted or missing entirely, the following actions are taken by the DS-System:

See Also



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