12Gbps SAS RAID Expansion Enclosure for QNAP NAS
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Simple & flexible storage expansion for QNAP NAS

The REXP-1620U-RP expansion enclosure is designed for expanding the storage space on a QNAP NAS* by connecting multiple expansion enclosures via high-speed mini SAS cables. Featuring a 12 Gbps SAS interface on the chassis, the REXP-1620U-RP ensures fast data passthrough from 12 Gbps SAS-enabled QNAP NAS even when using 6Gbps hard drives. This is especially useful for large data applications that require high performance interconnection, such as video surveillance, archiving large data, and TV broadcast storage.

  • Plug and use, seamless capacity expansion
  • Missing mode protection
  • High density, high efficiency and high scalability
  • Flexible management with the QTS Storage Manager
  • Backup storage for the QNAP NAS
  • Supports SAS 12 Gbps, SAS/SATA 6 Gbps HDD and SSD
  • Backward compatible with a 6 Gbps SAS-enabled NAS / REXP expansion unit and 6 Gbps SAS HBA by using the 12Gb/s SAS for 6Gb/s SAS cable (CAB-SAS10M-8644-8088).


*Supported QNAP NAS models and the maximum number of applicable expansion enclosures.

Turbo NAS models TVS-EC2480U-SAS-RP
(QTS 4.2.0+)
RAM of NAS >= 8GB >= 8GB >= 8GB >= 8GB >= 8GB >= 8GB
Maximum number of
8 8 8 8 8 8
Maximum number of hard drives 152 144 140 143 136 132
Maximum raw capacity* 1216 TB 1152 TB 1120 TB 1102 TB 1088 TB 1056 TB
Maximum RAID group size in NAS 192 TB 128 TB 96 TB 78 TB 64 TB 32 TB
Maximum RAID group size in REXP-1620U-RP 96 TB
Maximum number of RAID groups per storage pool 128
Maximum storage pool size 308 TB
Maximum number of storage pools per system 128
Maximum flexible volume size 250 TB
Maximum iSCSI LUN size 250 TB

Turbo NAS models SS-EC2479U-SAS-RP SS-EC1879U-SAS-RP SS-EC1279U-SAS-RP
RAM of NAS >= 4GB >= 4GB >= 4GB
Maximum number of REXP-1620U-RP 8** 8** 8**
Maximum number of hard drives 152 146 140
Maximum raw capacity* 1048 TB 1042 TB 1036 TB
Maximum RAID group size in NAS 24 TB 18 TB 12 TB
Maximum RAID group size in REXP-1620U-RP 128 TB
Maximum number of RAID groups per storage pool 128
Maximum storage pool size 308 TB
Maximum number of storage pools per system 128
Maximum flexible volume size 250 TB
Maximum iSCSI LUN size 250 TB

*The maximum capacity is calculated by using 8 TB 3.5" HDDs & 1 TB 2.5" HDDs.
** Purchasing a SAS expansion card is required for connecting over 4 units of RAID expansion enclosures.

Plug and use, seamless capacity expansion

Simply connect a REXP-1620U-RP to a QNAP NAS* and power it on. The QNAP NAS will detect the hard drives in the REXP-1620U-RP as newly-installed local drives. You can seamlessly expand and manage the NAS capacity by using the powerful QTS Storage Manager.

*The QNAP NAS must be using QTS 4.2 (or a newer version).

Missing mode protection

When the disconnection of a RAID expansion enclosure is detected, the NAS blocks IO access to protect data. The system can recover from missing mode to its normal state with the data staying intact.

High density, high efficiency and highly scalable

The REXP-1620U-RP supports 16 hard drives and 128TB raw capacity in 3U rack space. The REXP-1620U-RP has three SAS wide ports for host connectivity and daisy-chaining respectively. Each SAS wide port combines four SAS channels (maximum 8 SAS channels supported per expansion enclosure), with each supporting 12Gbps full duplex speed. The solution delivers unprecedented performance of up to 48Gbps per host connection.

Powerful QTS Storage Manager

The QTS Storage Manager neatly presents tools and options for managing system storage with an intuitive graphical user interface, which simplifies the process of NAS capacity expansion and REXP-1620U-RP management. IT administrators can easily monitor the health of the REXP-1620U-RP and the disks within it. When cascading multiple expansion enclosures in a rack, the Locate Disk and Locate Enclosure functions assist IT administrators in quick maintenance.

Learn more: QTS Storage Manager

An excellent backup solution for the QNAP NAS

In addition to expanding an existing volume, IT administrators can use the REXP-1620U-RP as a budget-friendly external storage to perform speedy and secure backup tasks for a QNAP NAS. The QNAP RTRR (Real-Time Remote Replication) or rsync service lets IT administrators back up NAS data to the REXP-1620U-RP on a real time or scheduled basis.

Learn more: RTRR, rsync

Flexible drive type and capacity

The REXP-1620U-RP offers high flexibility in hard drive selection. IT administrators can choose enterprise-level SAS HDDs with high performance and high reliability for mission-critical applications, low-cost but high-capacity SATA HDDs for large data archiving, or high-speed and high-stability SSDs for I/O-intensive operations.

Accessories (optional purchase)

Order P/N Product descriptions

  1. Dual-wide-port storage expansion card, SAS 12Gbps.
  2. Applicable NAS models:
    TVS-EC1280U-SAS-RP, TVS-EC1680U-SAS-RP, TVS-EC2480U-SAS-RP, TVS-EC1580MU-SAS-RP, TS-EC2480U, TS-EC1680U, TS-EC1280U, TS-EC880U; SS-EC1279U-SAS-RP; SS-EC1879U-SAS-RP; SS-EC2479U-SAS-RP; TS-EC1279U-SAS-RP ;TS-EC1679U-SAS-RP; TS-EC1679U-RP, TS-EC1279U-RP, TS-EC879U-RP  TVS-1271U-RP, TVS-871U-RP

Note: The storage expansion card is to be installed in the NAS for connecting to the RAID Expansion Enclosures.

A03 series (Chassis) rail kit, max. load 57 kg

Mini SAS external cable (SFF 8644to SFF 8644), 1.0 m

Mini SAS external cable (SFF 8644 to SFF 8644), 0.5 m

Mini SAS external cable (SFF 8644 to SFF 8088), 1.0 m

Note: A 12Gb/s SAS for 6Gb/s SAS cable is required to connect the REXP-1620U-RP to a 6Gb/s SAS-enabled NAS or 6Gb/s SAS-enabled REXP-1200U-RP/REXP-1600U-RP. The transfer rate over the cable will be 6Gb/s.