Progress Fathom Replication
User’s Guide

> ## Source and target architecture requirements

> Before Fathom Replication begins, the source and target database are automatically checked to ensure that the following are identical:

> - The logical structure of the databases (all user-defined areas must be identical except the AI areas).

> - The versions of the databases.

> - The database block sizes.

> - If large file support is enabled, it must be enabled on both databases.

> - AI (if enabled on the target) and Before Image (BI) block sizes.

> Once Fathom Replication is configured and running, it will propagate any source database changes to the target database. The following guidelines apply in order for the Fathom Replication to function properly:

> - For safety, the target database should reside on a different machine than the source.

> - Both the source and the target machines must have the same endian ordering. Endian ordering refers to the order in which multi-byte numbers are stored in memory. Typically, UNIX machines and Windows machines use different endian ordering for storage.

> Therefore, a Windows source database can be replicated to another Windows machine, but not to an HPUX machine. An HPUX source database can be replicated to another HPUX machine.

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