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Silver 12-bay rackmount SAS enclosure with front drive trays and rear redundant power supplies

Synology Inc.

Synology RXD1219sas 12-bay SAS raid enclosure

SKU CH-CMGJ-ZYBGD MPN RXD1219sas

A 12-bay SAS enclosure adds redundant, hot-swappable storage to compatible Synology systems via Mini-SAS HD links

  • DriveSAS
  • External I/O1 x SAS IN 1 x SAS OUT
  • 3.5" drive bays12 × 3.5/2.5 in SAS HDD/SSD (drives not included)
  • Power supply100 V to 240 V AC, 50/60 Hz, single phase
  • Temperature rangeOperating temperature: 0 °C to 35 °C (32 °F to 95 °F) Storag
  • Humidity range5% to 95% RH
  • 12 SAS drive bays expand storage capacity instantly
  • Plug-and-play design adds capacity without downtime
  • Mini-SAS HD links deliver high-speed data throughput
  • Redundant power supplies keep the system running during a failure
  • Fast rack-mount lock support with Synology Rail Kit RKS1317

12-bay SAS expansion enclosure

The Synology RXD1219sas is a 12-bay SAS RAID enclosure designed to add raw capacity to a compatible Synology host. It accepts twelve 3.5-inch or 2.5-inch SAS hard drives or SSDs, which are not included with the unit. Dual mini-SAS HD ports provide the upstream and downstream links for high-performance data transmission. Redundant power supplies help maximise service uptime in a 2U rackmount form factor.

IT teams expanding SAS volumes

This enclosure suits administrators who need to grow existing SAS-based storage pools without interrupting service, thanks to online volume expansion on the fly. It is not for environments that lack a host system with a mini-SAS HD connection, nor for teams requiring direct network-attached storage functionality. Buyers without a Synology Rail Kit RKS1317 should verify their own rack-mounting method before purchase.

Mini-SAS HD dual-port connectivity

The single specification that decides fit is the pair of mini-SAS HD ports labelled SAS IN and SAS OUT. Your host controller or primary unit must present an identical mini-SAS HD interface to attach this enclosure. If your infrastructure uses a different external storage connector, this unit cannot be integrated.

How it compares

Measured against everything we stock in RAID Arrays & Drive Enclosures, at today’s prices. Recalculated every night.

Price $3,004.99
Pricier than about 80% of the 16 comparable items (median $825.99).

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Specifications

Product
Brand nameSynology
Model nameRXD1219sas
Storage
DriveSAS
3.5" drive bays12 × 3.5/2.5 in SAS HDD/SSD (drives not included)
Power
Power supply100 V to 240 V AC, 50/60 Hz, single phase
Size & build
Product dimensions3.46 in × 16.95 in × 27.24 in
3.46 in × 18.98 in × 28.5 in (with server ears)
Product weight40.12 lb (18.2 kg)
Shipping weight20.00 kg
Package size800 × 550 × 120 mm
In the box
In the box1 x RXD1219sas main unit
1 x Quick Installation Guide
1 x Accessory pack
2 x AC power cord
2 x Expansion cable
Environment & compliance
Temperature rangeOperating temperature: 0 °C to 35 °C (32 °F to 95 °F)
Storage temperature: -20 °C to 60 °C (-5 °F to 140 °F)
Humidity range5% to 95% RH
More details
External I/O1 x SAS IN
1 x SAS OUT

Questions about this item

How do I connect the RXD1219sas to my Synology NAS using the Mini-SAS HD expansion cables?

Power off the NAS and enclosure. Connect one supplied expansion cable from the NAS SAS port to the RXD1219sas SAS IN port. Secure the thumbscrews. Power on the enclosure first, then the NAS. The step often missed is powering the expansion unit before the host.

Which components in the RXD1219sas are field-replaceable if they fail later?

The two redundant power supply modules are hot-swappable. Each 3.5" drive carrier can be removed without tools. The cooling fans are not user-serviceable. Keep spare power modules on hand for rapid replacement.

At what ambient temperature does the RXD1219sas risk thermal throttling under sustained write loads?

The rated operating ceiling is 35 °C. Above that temperature the dual redundant power supplies and fan curves cannot guarantee stable throughput, so sustained heavy I/O may throttle or trigger protective shutdown.

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