What kind of storage does not support scale-out?

Scale-out storage is a network attached storage (NAS) architecture, in which the disk capacity can be expanded as needed. If a given disk array reaches the storage limit, you can add another array to expand the system capacity.

Scale-out storage is a network attached storage (NAS) architecture, in which the disk capacity can be expanded on demand, that is, some drives are built into other storage arrays. If a given disk array reaches the storage limit, you can add another array to expand the system capacity.

Conceptually, scale-out storage is different from traditional scale-up storage. In a vertical expansion system, network storage is limited by a single form factor, while in a horizontal expansion system, new hardware can be added and configured when necessary. The main advantages of scale-out mode are cost saving and more effective use of hardware resources.

Before scale-out storage becomes popular, enterprises often need to buy a large number of storage arrays to ensure that there is enough disk space for future expansion. If there is no expansion later or the expansion is much less than expected, then the original disk will be wasted. With the scale-out architecture, you can do what you can when buying disks. Once the storage space requirements exceed expectations, you can add new arrays without any restrictions. [ 1]