You need to keep these restrictions in mind while planning the installation and configuration of Sun Cluster HA for Informix.
Informix binary files – You need to place the INFORMIXDIR directory on a shared storage such as a cluster file system or a highly available local file system.
Alternatively, you can install Informix locally on each node. In this case, the INFORMIXDIR directory will reflect a local file system.
If you decide to install Informix locally on each node, you must ensure that the ONCONFIG and INFORMIXSQLHOSTS files are kept in synchronization across the cluster nodes.
Informix database files – You must ensure that the Informix database files are placed on a shared storage. You can use a highly available local file system, cluster file system, or raw devices.