Problem
Viewing storage usage within deduplication container files.
Solution
A deduplication command reports on storage usage within containers.
The following is an example of the command usage on a Windows deduplication storage server. The command shows the data store statistics ( --dsstat option).
C:\Program Files\Backup Exec>crcontrol.exe --dsstat
************ Data Store statistics ************
Data storage Size Used Avail Use%
35.1T 5.3T 29.8T 15%
Number of containers : 98125
Average container size : 268211087 bytes (255.79MB)
Space allocated for containers : 26318212931722 bytes (23.94TB)
Space used within containers : 24563636296449 bytes (22.34TB)
Space available within containers: 1754576635273 bytes (1.60TB)
Space needs compaction : 18875042669860 bytes (17.17TB)
Records marked for compaction : 139455139
Active records : 43562983
Total records : 183018122
The following is an example of the command usage. The command shows the data store statistics ( --dsstat option).
Figure 'Container space usage' shown below is a visual representation of the deduplication storage space. From the crcontrol --dsstat output, you can determine the following:
The Size is obtained from the operating system, 35.1T in the preceding example output.
The Used space = the file system used space - Space available within containers - Space needs compaction . BackupExec obtains the file system used space from the operating system. For the preceding example output, the file system used space - 1.6TB - 17.17TB = 5.3TB.
The space actually used to store data = Space used within containers - Space needs compaction : 22.34TB - 17.17TB = 5.17TB. This value differs from the 5.3TB in the example output because the command output includes the overhead space that is used in the data store.
The available space ( Avail ) = Size - Used, 35.1TB - 5.3TB = 29.8TB in this example.
The percentage of space used ( Use% ) = Used / Size , 5.3TB / 35.1TB = 15%.
For help with the command options, use the --help option.
The BackupExec Deduplication Manager periodically compacts the space available inside the container files. Therefore, space within a container is not available as soon as it is free. Various internal parameters control whether a container file is compacted. Although space may be available within a container file, the file may not be eligible for compaction. The BackupExec Deduplication Manager checks for space every 20 seconds.
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