Viewing storage usage within deduplication container files

Problem

Viewing storage usage within deduplication container files.

Solution

A deduplication command reports on storage usage within containers.

The following is the pathname of the command:

  • On Windows systems, the path name of the command is install_path\Backup Exec>crcontrol.exe --dsstat  

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.

 

 

Terms of use for this information are found in Legal Notices.

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