Interstage Shunsaku Data Manager Operator's Guide - Microsoft(R) Windows(R) 2000/ Microsoft(R) Windows Server(TM) 2003 - - UNIX -

4.3.2 Optimizing Director Data Files

If there are a large number of search data deletions or update processes, the amount of wasted space in the director data files may increase, and search performance may drop. In this case, optimize the director data files.

[Figure : Example of Optimizing Director Data Files]

Check the fragmentation rate to determine whether the director data files should be optimized. Execute the shundstate command to check the fragmentation rate.

Fragmentation is where data is scattered. Access efficiency drops as the fragmentation rate increases.

The fragmentation rate indicates the ratio of the required data stored in the director data files (as specified in the DataFileFolder parameter in the director environment file) to the redundant data left over from processes that were canceled during deletions or updates. Larger values indicate that there is more redundant data.

The larger the fragmentation rate, the more disk space will be used. For example, a fragmentation rate of 75% means that the required data is 25% (100% - 75%), so the amount of disk space being used is four times as large as the actual amount of data.

Use the following procedure to optimize the director data files:

[Figure : Procedure for Optimizing Director Data Files]

1. Execute the shundstate command to check the fragmentation rate.

   shundstate -s director identifier -w

2. If the increase in the fragmentation rate indicates that the director data files need to be optimized, execute the shundcds command to optimize the director data files.

   shundcds -s director identifier

3. Execute the shundstate command to check that the fragmentation rate is 0% after the director data files have been optimized.

   shundstate -s director identifier -w

• Refer to Appendix E Conflict Relationships for more information on the shundcds command and on conflict relationships between applications and commands.
• While director data files are being optimized, the amount of disk space required temporarily is equal to twice the size of the director data files.

• Refer to 6.2.3 Monitoring Director Operation Information for more information on the content displayed by the shundstate command.