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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

  • Port RJ-454 x 10/100/1000M
  • Port USB2 x USB 3.2 Gen 1
  • HDD Interface12 x SATA (12 x Bay)
  • Form Factor12-Bay
  • ProcessorIntel Xeon D-1531 6-core (12-thread) 2.2GHz
  • Installed Memory8GB DDR4

Model RS3621RPxs

Struck-through versions exist but are not stocked here.

  • 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.

Highlights

  • 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

Specifications

BrandSynology
ModelRS3621RPxs
Port RJ-454 x 10/100/1000M
Port USB2 x USB 3.2 Gen 1
HDD Interface12 x SATA (12 x Bay)
Form Factor12-Bay
ProcessorIntel Xeon D-1531 6-core (12-thread) 2.2GHz
Installed Memory8GB DDR4
Max Memory Capacity64GB
Memory Slot4
Included HDD CapacityDiskless System
Max Capacity216TB
Drive CompatibilityOnly drives listed on the compatibility list can be used to create storage pools*
Only Synology SAT5200 2.5" or Synology SNV3500 series SSDs (sold reparately) can be used to create SSD caches**
* Check Synology compatibility list for supported drives.
** SSD cache can be enabled by using Synology SAT5200 2.5" SSDs or without occupying drive bays by installing Synology SNV3500 NVMe SSDs using M2D20 or E10M20-T1 adapter cards, sold separately
RAIDRAID 0, 1, 5, 6, 10, JBOD, Synology RAID F1, Basic
Supported ProtocolsSMB, AFP, NFS, FTP, WebDAV, CalDAV, iSCSI, Telnet, SSH, SNMP, VPN (PPTP, OpenVPN, L2TP)
Power100 V to 240 V AC, 50/60 Hz, single phase
Power Consumption140.01 W (Access)
65.94 W (HDD Hibernation)
FeaturesPowerful Performance
Up to 189,098 random read IOPS and 4,718 MB/s sequential read performance
Powerful Compute
Host multiple compute-intensive services with its 6-core Intel processor
Upgradability
Two PCIe expansion slots allow for M.2 NVMe cache adapters and high-bandwidth network cards
Redundant Power
Ensure business continuity with two redundant power supplies
On-demand Scalability
Supports up to 36 drive bays using two RX1217(RP)
UsageUltra high prerformance for large number of users
TemperatureOperating temperature: 0°C to 35°C (32°F to 95°F)
Storage temperature: -20°C to 60°C (-5°F to 140°F)
Humidity5% to 95% RH
Dimensions3.46" x 18.98" x 28.50"
Weight31.97 lbs.
Package Contents1 x RS3621RPxs main unit
1 x Quick Installation Guide
1 x Accessory pack
2 x AC power cords
Shipping weight19.21 kg
Package size855 × 626 × 235 mm

Other versions of this model

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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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