In a business continuity cluster, entire LUNs fail over to other peer clusters. Therefor any LUN in your storage setup may only be assigned to one BCC enabled pool.
Multiple LUNs can be used as segments in a pool if the storage systems used in the clusters can fail over groups of LUNs, sometimes called consistency groups.
A cluster-enabled NSS pool must contain at least one volume before its cluster resource can be enabled for business continuity. You get an error message if you attempt to enable the resource for business continuity if its NSS pool does not contain a volume.