A customer's HP StoreServ 7200 Storage System has built-in disk chassis, and additional 2 drive chassis. Customer would like to add additional drives to their storage system. What is the minimum numbe

Adding only two drives is insufficient for the 2-node 7200 because the 3PAR chunklet distribution model cannot form balanced, RAID-protected groups across both nodes with just two new physical drives.

3PAR's architecture segments drives into chunklets and distributes them across nodes for RAID protection. In a 2-node StoreServ 7200, adding fewer than three drives prevents the system from forming valid chunklet sets that span both nodes with the required redundancy. Three drives is the documented minimum expansion increment that allows the system to create balanced, protected chunklet groups across the 2-node topology.

Five drives exceeds the minimum permissible addition and would represent a larger incremental expansion, not the smallest valid configuration change.

Nine drives corresponds to a full drive cage increment used in larger 3PAR systems or full cage replacements, far exceeding the minimum for the StoreServ 7200.