Modifying the ISPF environment

To make it easy to start File Manager under ISPF, configure your ISPF environment as described in the following sections.

TSO region size

When using File Manager from ISPF, it is recommended you use at least a 4 MB logon region size (in conjunction with the 32 MB of "extended" storage that TSO generally provides) to provide enough 24-bit storage for various functions to operate effectively. A suggested minimum TSO region size is 40 MB.

This starting value might need to be increased when performing intensive virtual storage functions, such as:
  • The use of templates with many fields or layouts.
  • In-memory editing of large files.