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The application must be capable of storing all required data and configuration information on shared disks. The exception to this rule is a true shared nothing cluster.
To meet this requirement, you may need specific setup options or soft links. For example, a product may only install in /usr/local. This limitation would require linking /usr/local to a file system mounted from the shared storage device or mounting file system from the shared device on /usr/local.
The application must also store data to disk rather than maintaining it in memory. The takeover system must be capable of accessing all required information. This requirement precludes the use of anything inside a single system inaccessible by the peer, such as NVRAM accelerator boards and other disk-caching mechanisms that are contained in a local host.