Datareplicator enables you to duplex files for data linkage, thereby improving reliability in the event of file errors.

Note

The time required for data linkage processing doubles when duplexed files are used because data is written to two files. When you are determining whether to use file duplexing, take into account this increase in data linkage processing time.

When you duplex files, define for each file type a desired logical file in the environment definition, and then define in the duplexing definition file the two physical files that are to constitute the logical file. One of these files is called the primary file and the other is called the secondary file. The contents of the primary and secondary files are the same. The following figure shows the relationship between a logical file and the primary and secondary physical files.

Figure 3-49 Relationship between a logical file and the primary and secondary physical files

Datareplicator writes the same information into the two physical files. If an error occurs on one of the files, Datareplicator disconnects that file and continues data linkage using the other file.

Organization of this section

3.9.1 Files that can be duplexed

3.9.2 Files associated with duplexing

3.9.3 Notes about duplexing