The DD (Directory Duplicate) command creates or deletes a backup copy of the flat directory of a pack family.

Each pack family can contain a maximum of three directories.

When you enter the DD command, if it is free of syntax errors, the system starts a visible independent runner named DD. Use the C (Completed Mix Entries) command to find out if the DD command has completed.

Syntax

Explanation

DD ON <family name> (<family index>)

Starts the DD procedure as an independent runner and performs an immediate copy operation. The duplicate directories are named SYSTEMDIRECTORY/nnn, where nnn, an integer from 1 through 255, is the family index of the unit receiving the duplicate.

DD – ON <family name> (<family index>)

Removes the duplicate directory. This form of the command cannot be used unless the pack indicated by the specified family index is online.

Example

DD ON MASTERPACK (2)

A

       ---Mix-Pri-CPU Time-------- 1 ACTIVE ENTRY ----------------
       * 9303   80       14:17   Job DD MASTERPACK (002)

Considerations for Use

If you enter a DD – command for a halt/load capable member that is not in use, the member is no longer halt/load capable. You cannot perform a DD – command on a member that is the active base pack.