You must have console access to all Solaris hosts in the cluster.
To gain console access, use one of the following devices:
The terminal concentrator that you purchased with your cluster hardware
The System Service Processor (SSP) on Sun Enterprise E10000 servers (for SPARC based clusters)
The system controller on Sun FireTM servers (also for SPARC based clusters)
Another device that can access ttya on each host
Only one supported terminal concentrator is available from Sun and use of the supported Sun terminal concentrator is optional. The terminal concentrator enables access to /dev/console on each host by using a TCP/IP network. The result is console-level access for each host from a remote machine anywhere on the network.
The System Service Processor (SSP) provides console access for Sun Enterprise E1000 servers. The SSP is a processor card in a machine on an Ethernet network that is configured to support the Sun Enterprise E1000 server. The SSP is the administrative console for the Sun Enterprise E1000 server. Using the Sun Enterprise E10000 Network Console feature, any machine in the network can open a host console session.
Other console access methods include other terminal concentrators, tip serial port access from another host, and dumb terminals.
You can attach a keyboard or monitor to a cluster host provided that the keyboard and monitor are supported by the base server platform. However, you cannot use that keyboard or monitor as a console device. You must redirect the console to a serial port, or depending on your machine, to the System Service Processor (SSP) and Remote System Control (RSC) by setting the appropriate OpenBoot PROM parameter.