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Silver 12-bay rackmount NAS with redundant power supplies and front drive trays

Synology Inc.

Synology Inc. RS3621RPxs 12-Bay Rackmount NAS Xeon 6-Core 2.2GHz 8GB DDR4

SKU CH-NBJB-64Z7W MPN RS3621RPxs

A 12-bay rackmount NAS with a 6-core Intel Xeon processor, 8GB DDR4 ECC memory, redundant power supplies and dual PCIe slots for 10GbE or NVMe expansion

  • CPUIntel Xeon D-1531 6-core (12-thread) 2.2 GHz
  • Form factor12-Bay
  • Power draw140.01 W (Access) 65.94 W (HDD Hibernation)
  • LAN ports4 × 10/100/1000M
  • USB ports2 x USB 3.2 Gen 1
  • Drive interface12 x SATA (12 x Bay)

Model RS3621RPxs

  • 12 drive bays scale raw capacity to 216 TB
  • Intel Xeon 6-core 2.2 GHz handles compute-intensive workloads
  • 8 GB DDR4 ECC memory expands to 64 GB across four slots
  • Dual PCIe slots add 10 GbE or NVMe cache
  • Redundant power supplies and hot-swap fans protect service continuity

12-Bay Rackmount NAS

The Synology RS3621RPxs is a 12-bay rackmount storage server built around an Intel Xeon D-1531 6-core processor running at 2.2 GHz with 8 GB of DDR4 ECC memory. It delivers up to 189,098 4K random read IOPS and 4,718 MB/s sequential read throughput for demanding business workloads. Dual redundant power supplies and hot-swappable fans protect against hardware failure.

Suits multi-user environments needing compute

This unit suits organisations that host multiple virtual machines, containers or heavy file-sharing services and require the reliability of redundant power and ECC memory. It is not suited for buyers who need more than 12 internal drive bays without adding an expansion unit. It is also not suited for deployments that require 10 GbE or NVMe caching without purchasing separate PCIe cards.

Sustained throughput with redundant safeguards

Under continuous load the system maintains high sequential and random read performance while the redundant power supplies keep services online if one unit fails. Hot-swappable fans can be replaced without powering down, preserving uptime during maintenance. The Btrfs file system adds data integrity checks that run during normal operation rather than only during scheduled scrubs.

How it compares

Measured against everything we stock in Rack-Mounted NAS Servers, at today’s prices. Recalculated every night.

Price $2,496.99
Cheaper than about 89% of the 763 comparable items (median $6,564.99).

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Specifications

Product
Brand nameSynology
Model nameRS3621RPxs
Recommended useUltra high prerformance for large number of users
Processor
CPUIntel Xeon D-1531 6-core (12-thread) 2.2 GHz
Memory
Installed RAM8 GB DDR4
Maximum RAM capacity64 GB
RAM slots4
Storage
Drive interface12 x SATA (12 x Bay)
Drives includedDiskless System
Supported RAID modes0, 1, 5, 6, 10, JBOD, Synology RAID F1, Basic
Connectivity
Protocol supportSMB, AFP, NFS, FTP, WebDAV, CalDAV, iSCSI, Telnet, SSH, SNMP, VPN (PPTP, OpenVPN, L2TP)
Ports & slots
LAN ports4 × 10/100/1000M
USB ports2 x USB 3.2 Gen 1
Power
Power draw140.01 W (Access)
65.94 W (HDD Hibernation)
Power details100 V to 240 V AC, 50/60 Hz, single phase
Size & build
Form factor12-Bay
Product dimensions3.46 in × 18.98 in × 28.5 in
Product weight31.97 lb (14.5 kg)
Shipping weight19.21 kg
Package size855 × 626 × 235 mm
In the box
In the box1 x RS3621RPxs main unit
1 x Quick Installation Guide
1 x Accessory pack
2 x AC power cords
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
Maximum capacity216 TB

Other versions of this model

4 more in the same range

Questions about this item

Which SATA drives must I supply to fill the 12 bays?

Only drives listed on the Synology compatibility list can create storage pools; 2.5" SAT5200 or SNV3500 SSDs are required for SSD cache

Can the four 1 GbE RJ-45 ports link directly to older 100 Mb switches?

Yes, each port auto-negotiates 10/100/1000 Mb so legacy 100 Mb gear will connect at its rated speed

How do I confirm the unit is delivering the rated 4,718 MB/s sequential read throughput?

Run a sequential read benchmark from a client over SMB or iSCSI and compare the measured throughput to the 4,718 MB/s specification

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