Auxiliary storage requirements

Auxiliary storage requirements should be considered while the system is converting the directories in a file system to the *TYPE2 format.

Here are several considerations regarding auxiliary storage requirements:

The final size of the directories after they have been converted to the *TYPE2 format
Additional storage required while the conversion function is running

In many cases, the final size of a *TYPE2 directory is smaller than a *TYPE1 directory. Typically, *TYPE2 directories that have less than 350 objects require less auxiliary storage than *TYPE1 directories with the same number of objects. *TYPE2 directories with more than 350 objects are ten percent larger (on average) than *TYPE1 directories.

While the conversion function is running, additional storage is required. The conversion function requires that the directories have both a *TYPE1 version and a *TYPE2 version in existence simultaneously.

Note: Before installing the i5/OS™ V5R3M0 operating system or a later release, you might want to consider running the *ESTIMATE option on the OS/400^® V5R2 (CVTDIR) command, because it can provide a conservative estimate of the amount of auxiliary storage needed during conversion.