The second zoning allocation option, shown in the Quick Setup dialog, equally divides the number of blade storage disks among the adjacent CPU blade servers.
Option 2 attempts to allocate the same number of storage disks as possible to each adjacent CPU blade server. If there are no storage blades adjacent to a CPU blade, then Sun Blade Zone Manager will allocate storage disks from the nearest possible storage blade.
Assigning CPU blades to adjacent storage disks is best suited for when: 1) the blade chassis system contains more CPU blade servers than storage blade servers, and 2) you want to equally deploy the storage resources among each CPU blade server.