Join to existing Cluster, 2 active and 1 passive [oracle solaris cluster]

hi,

now I have I current cluster on my server, active passive methode. and now is running well.

but we have plan to joint new node for existing cluster, so totally our server is 3

let me explain :

node 1 = active

node 2 = passive,

when node 1 having issue, the cluster will swing to node 2.

now we have node 3

we want to setup node 3 to join cluster with node 2, like:

node 1 = active

node 2 = passive

node 3 = active

our goal is, when node 1 have issue, they will move to node 2.

seems like existing, when node 3 issue ldom on node 3 will swing to node 2.

so node 2 function only deliver when node 1 or node 3 having issue.