Multiple Instances and 9iRAC

[Thompson, Todd]

My company is currently considering using Oracle 9i RAC. One of the proposed environments is to have multiple oracle instances (3 or more) configured on a 4-8 node RAC cluster. Does anyone have any insights as to the viability of this implementation?  Will the high speed inter connect be able to handle the traffic from multiple instances?  I always thought of RAC as a single instance implementation with each instance needing its own cluster...........