Additional Shelf Required

Hi All,

We have a scenario where addtioanl storage shelf is required.

The customer has 2 appliances SYMC NETBACKUP 5020 APPLIANCE 32TB WITH 6 1GB ETHERNET SUPPORT 4HR INITIAL 36 MONTH. He want to upgrade with additional (20TB minimum) storage,

Can anyone please advice what should be the right storage shelf.which needs to be purchased?

Thank you