Troubleshooting: Comparing totals from DS-System reports with DS-Client reports


Creation Date: June 17, 2010
Revision Date: October 12, 2011
Product: DS-System & DS-Client

Summary

This article describes the reasons why DS-System reports may show differences if comparing to DS-Client reports.

Details

DS-Client Backup Sets Report

In the DS-Client's Backup Sets Report, the current "Protected Size" value is updated at the end of an activity. This means, if a backup activity is running for multiple hours/days, the current protected size will only be updated once the backup activity ends. Until the end of that activity, the data size is held in the DS-Client computer's memory.

DS-System Backup Sets Report

In the DS-System's Backup Sets Report, the current "Protected Size" value is updated almost in real time. Whenever a file is received by the DS-System, the stream size of that file is stored in the DS-System computer's memory and its size is added to the backup set's "protected size" amount stored in the DS-System database every 5 minutes.

In case of deletions (including overwriting generations, recycled generations or actual deletions of generations from the online storage), the stream size of the deleted files is subtracted from the total current "protected size" for that backup set.

Even though the DS-Client's Backup Sets Report is only updated at the end of an activity and the DS-System's Backup Sets Report is updated every 5 minutes, it is still possible that these two reports will match when viewed at any given moment. However, it is more probable that these two reports will show (slightly) different numbers.

DS-Client Storage Summary Report

The DS-Client Storage Summary Report is a Historical Report that keeps track of the amount of data at DS-Client level. This information is retrieved and stored in the DS-Client database for this historical report by Daily/Weekly Admin activities. If Daily/Weekly Admin are not running, there will be no relevant data in the Storage Summary Report. If Daily/Weekly Admin processes are running more often then there will be additional entries in this report.

DS-System Storage Usage Report

The DS-System Storage Usage report is NOT updated in real time. Only the System Admin process updates the data used for the Storage Usage report, and because of the intense I/O and processing requirements, the default is to run System Admin once a week per backup set.

If System Admin does not run at all or if it only runs periodically, the values in the Storage Usage report will not be up-to-date. If a Full System Admin is run and completes successfully on all backup sets of a DS-Client, then the "protected size" amount in the Storage Usage report should match the Storage Trend report. Note that for large backup sets, the System Admin will take some time to complete.

DS-System Storage Trend Report

The DS-System Storage Trend Report is updated at the specified interval of time based of the configuration of the DS-Client on the DS-System (DS-Client menu > Advanced Tab: Storage History Setting). By default, the data in this report is updated daily, however this is configurable for each DS-Client (in intervals of 5, 10, 15 or 30 minutes, 1 hour or 1 day).

The DS-System's Storage Trend is a DS-Client level report only. The updates to this report are done when the time interval passes from one interval into another (e.g. if a DS-Client is configured to keep track of data every 1 day, then the report data is updated at 12 AM when passing from one day to the next). Invoice reports are based on the Storage Trend report.

Conclusion

As described above, when you compare the numbers from different reports, they will most likely not match due to the differences in times when they are updated. In particular:



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