For SVM, you need to create SVM state database replicas if you're not using it yet (with metadb). Then you'd use metainit to create a stripe with slices on all those disks.
docs.sun.com under the Solaris version you are using (presumably 10) has a section on Volume Manager.
For ZFS, you'd use zpool to add all the disks into the same pool. That would automatically create and mount a filesystem in the pool to use.
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Darren