FlashBlade is a 4U appliance, which scales from 7 blades and up to 5 chassis for a total of 75 blades. All software is included, and no further tuning is required. Each blade has a capacity ranging from 8 to 52 TB, and can be mixed as needed. FlashBlade is also covered by the Evergreen Storage Subscription, where smaller blades can be swapped out as the demand for capacity increases.
FlashBlade data sheet