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© 2012 IBM Corporation
Information Management
Informix CEE/MEA Technical Sales
Informix Rolling Upgrade
© 2012 IBM Corporation2
Rolling Upgrade Overview
� You can upgrade the Informix software in a high-availability cluster (HDR or RSS) withoutincurring any down time.
� To upgrade Informix software on a high-availability cluster, the following is required
1. Convert the primary server and the secondary to standalone Enterprise Replication (ER) servers.
2. Upgrade the software on the secondary server3. Stop ER4. Clone the server using the ifxclone command.
� You can perform the upgrade while the servers are actively processing client requests because ER supports replication between dissimilar versions of the server software.
© 2012 IBM Corporation3
The following prerequisites apply when upgrading software on a cluster
� The sqlhosts files must be configured for Enterprise Replication:– Each server must belong to a different group.– The group identifier for each server must be different.– The sqlhosts files on each server must contain a server and a group entry for the other
server.
� Non-logged databases are not supported.
� Raw or unlogged tables are not supported.
� No tables can be defined with label-based access control.
� Typed tables must have primary keys.
� User-defined types must support Enterprise Replication.
� The CDR_QDATA_SBSPACE configuration parameter must be set on both the primary and secondary servers.
� For versions of Informix software earlier than 11.50xC7, converting a primary and secondary server pair to ER is not supported if a table does not have a primary key.
� For versions of Informix software earlier than 11.10, the sec2er command is not supported.
© 2012 IBM Corporation4
Informix Primary & Informix Secondary (HDR)
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On the primary server perform a check to see whether the servers can be split into ER servers
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The sec2er command converts the primary and secondary servers into standalone servers and configures and starts Enterprise Replication
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© 2012 IBM Corporation8
© 2012 IBM Corporation9
Primary server
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Secondary Server
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Data modifications still replicated
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Prepare former secondary to upgrade, former primary still active
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Install new version of Informix software on the former secondary
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Start the server and let the conversion complete successfully
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Conversion Completed Successfully !!! ☺
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Upgraded secondary server replicates data with the former primary server
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Move client application connections from the former primary server to the upgraded server
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Install new version of Informix software on the former primary
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Start to configure HDR, both servers have new Informix software version
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© 2012 IBM Corporation21
Finished !!! ☺ ☺
