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TIBCO Rendezvous® 8.7.0

# Member File Access

When members of a fault tolerance group depend on file access, it is crucial that each member use a private copy of every relevant file. In particular, consider these two guidelines.

| • | Do not share files.

Ensure that two members never modify the same file. Sharing a file can corrupt the data in that file (even when the members do not write to it simultaneously). Using local files prevents this kind of corruption.

| • | Store files on the local host computer, not across the network on a file server—and especially not on a separate network or segment.

In situations where network disconnect causes a member to activate, that same disconnect can separate the activating backup member from network-mounted files. Using local files keeps the data where it is needed.

## Copying Context Files

In some programs, an activating member must establish its operating context by reading files left by a previously active member that has failed. When using this technique, be sure to make a local, private copy of the file.

When the content of the context files changes frequently, inactive members can periodically copy the context files, so that a network disconnect does not preclude access when it is needed.

## Upgrading Versions

When upgrading a program to a new version, it is sometimes important that old and new versions run simultaneously. Be sure that the two process instances do not reference the same file. Instead, make a local copy of the file for the new version to use.

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