Service Restrictions

Observe the following service restrictions for Sun Cluster configurations:

• Routers – Do not configure cluster nodes as routers (gateways) due to the following reasons:

  • Routing protocols might inadvertently broadcast the cluster interconnect as a publicly reachable network to other routers, despite the setting of the IFF_PRIVATE flag on the interconnect interfaces.

  • Routing protocols might interfere with the failover of IP addresses across cluster nodes that impact client accessibility.

  • Routing protocols might compromise proper functionality of scalable services by accepting client network packets and dropping them, instead of forwarding the packets to other cluster nodes.

• NIS+ servers – Do not configure cluster nodes as NIS or NIS+ servers. There is no data service available for NIS or NIS+. However, cluster nodes can be NIS or NIS+ clients.

• Boot and install servers – Do not use a Sun Cluster configuration to provide a highly available boot or installation service on client systems.

• RARP – Do not use a Sun Cluster configuration to provide an rarpd service.

• RPC program numbers – If you install an RPC service on the cluster, the service must not use any of the following program numbers:

  • 100141

  • 100142

  • 100248

  These numbers are reserved for the Sun Cluster daemons rgmd_receptionist, fed, and pmfd, respectively.

  If the RPC service that you install also uses one of these program numbers, you must change that RPC service to use a different program number.

• Scheduling classes – Sun Cluster software does not support the running of high-priority process scheduling classes on cluster nodes. Do not run either of the following types of processes on cluster nodes:

  • Processes that run in the time-sharing scheduling class with a high priority

  • Processes that run in the real-time scheduling class

  Sun Cluster software relies on kernel threads that do not run in the real-time scheduling class. Other time-sharing processes that run at higher-than-normal priority or real-time processes can prevent the Sun Cluster kernel threads from acquiring needed CPU cycles.