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Migrating and upgradingYou can upgrade to the 14.10 release of HCL Informix® or migrate from other database servers to Informix®. Upgrading is an in-place migration method that uses your existing hardware and operating system software. Some changes to the Informix® database server can affect upgrading from a previous release.
Migrating Informix® database systemsThe Informix® Migration Guide describes how to move data manually between databases, servers, and computers.
Migration to and reversion from 14.10
Reverting from Informix® Version 14.10You can revert to the version of the database server from which you migrated. When you run the reversion utility, you specify the target server for reversion and then Informix® checks your database. If necessary, Informix® might tell you to drop new objects, before automatically converting your data into the target server.
Reverting from Informix® Version 14.10After preparing to revert, run the reversion utility and prepare to use the original database server.
Remove Any Communications Support Module SettingsIf your Informix® Version 14.10 instance used CSMs, edit the sqlhosts file to remove any csm option settings that are not supported in the older database server.

Remove any Communications Support Module settings

If your Informix® Version 14.10 instance used CSMs, edit the sqlhosts file to remove any csm option settings that are not supported in the older database server.

If you do not do this, the older database server will return an invalid sqlhosts options error.

You must also delete the concsm.cfg file if the older database server does not support CSMs.

Note: Support for Communication Support Module (CSM) is removed starting Informix Server 14.10.xC9 . You should use Transport Layer Security (TLS)/Secure Sockets Layer (SSL) instead.

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