QTS provides a flexible volume architecture that enables you to easily manage, store, and share files.

Figure 1. QTS Flexible Volume Architecture





Physical device that stores and retrieves data

QNAP NAS devices support the following disk sizes and types:


  • 3.5-inch, 2.5-inch

  • Specific models: M.2



  • Specific models: SAS, NL-SAS, NVMe PCIe SSD, NVMe M.2 PCIe SSD


All of the above disk types can be used to create storage pools and static volumes. Only SSDs, NVMe PCIe SSDs, and NVMe M.2 SSDs can be used in the SSD cache.

RAID group

Logical disk that consists of one or more disks. RAID groups usually contain disks that are of the same type and capacity.

Data is distributed across the disks in a RAID group. Each RAID type offers a different combination of reliability, performance, and capacity. For details, see RAID.

Storage pool

Pool of storage space that consists of RAID groups

Storage pools can aggregate RAID groups that consist of disks of different types and capacities. Storage pools enable easier storage space management and features such as snapshots.


Portion of storage space that is used to divide and manage storage capacity

You can create volumes by dividing storage pool space, or using the space of a RAID group. QTS offers three different volume types, with different combinations of performance and flexibility. At least one volume must be created before the NAS can start storing data.

iSCSI LUN (logical unit number)

Portion of storage space that can be used by other NAS devices through the iSCSI protocol

QTS offers two LUN types.

  • Block-based LUN: Created from a storage pool. It is similar to a volume, except that it has no file system and must be linked to an iSCSI host.

  • File-based LUN: Created on a volume. It is similar to an ISO image file.

Shared folder

Folder that is used for storing and sharing files

Shared folders are created on volumes. QTS automatically creates default shared folders for multimedia, public documents, and downloads. You can create more shared folders and configure permissions for each.