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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
High-availability cluster migrationYou must coordinate the migration and reversion of all servers that are involved in high-availability clusters. You can use a rolling upgrade in some cases to update servers while the cluster is online, with minimal interruption to client applications. Otherwise, you must schedule cluster downtime to upgrade the servers. A cluster must be offline to reverse an upgrade or revert to an earlier release.
Restoring a cluster from the HDR secondary serverYou can restore the primary server from the High-availability Data Replication (HDR) secondary server that you prepared to use as a backup server before you migrated or reverted the cluster. After you restore the primary server, you must recreate the other servers in the high-availability cluster.

Restoring a cluster from the HDR secondary server

You can restore the primary server from the High-availability Data Replication (HDR) secondary server that you prepared to use as a backup server before you migrated or reverted the cluster. After you restore the primary server, you must recreate the other servers in the high-availability cluster.

Before you begin

Prerequisite: You prepared the HDR secondary server to use as a contingency backup server, according to information in Preparing to migrate, upgrade, or revert clusters.

Procedure

To restore a cluster from the HDR secondary server:

Start the HDR secondary server by running an oninit command.
Change the secondary server to the primary server by running the onmode -d make primary hdr_server_name command.
If the server is in quiescent mode, change it to multi-user mode by running an onmode -m command.
Make a level-0 backup using the ON-Bar or ontape utility.
Recreate the rest of the high-availability cluster.

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