look, this is not helpfull. see it from your side, if you were given the infos you give us, would you be able to come up with a procedure to replace a disk?

if you don't know the modell of the storage, a photo might be helpfull. also the configuration of the cluster and storage is helpfull. here are some infos we might need to help you:

- solaris version
- cluster version
- config of cluster (scstat/scdidadm/...)
- ... (means all information that is helpfull)

also, you should have a support contract for the system? if it is an important system there should be!

you can find all the documentation from oracle at Oracle Documentation for more infos about the products to get you started!