Synology 6 bay NAS DiskStation DS1621+

CPU

CPU Model

AMD Ryzen V1500B

CPU Quantity

1

CPU Architecture

64-bit

CPU Frequency

4-core 2.2 GHz

Hardware Encryption Engine (AES-NI)

Memory

System Memory

4 GB DDR4 ECC SODIMM

Memory Module Pre-installed

4 GB (4 GB x 1)

Total Memory Slots

2

Maximum Memory Capacity

32 GB (16 GB x 2)

Notes

·       Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.

·       Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.

·       For more information about the recommended memory configurations, please check the Hardware Installation Guide of your Synology product.

Storage

Drive Bays

6

Maximum Drive Bays with Expansion Unit

16 (DX517 x 2)

M.2 Drive Slots

2 (NVMe)

Compatible Drive Type* (See all supported drives)

·       3.5" SATA HDD

·       2.5" SATA HDD

·       2.5" SATA SSD

·       M.2 2280 NVMe SSD

Hot Swappable Drive*

Notes

·       The hot swappable drive feature is not supported by M.2 SSD slots.

·       "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.

External Ports

RJ-45 1GbE LAN Port

4 (with Link Aggregation / Failover support)

USB 3.2 Gen 1 Port*

3

eSATA Port

2

Notes

The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.

PCIe

PCIe Expansion

1 x Gen3 x8 slot (x4 link)

Appearance

Size (Height x Width x Depth)

166 mm x 282 mm x 243 mm

Weight

5.1 kg

Others

System Fan

92 mm x 92 mm x 2 pcs

Fan Speed Mode

·       Full-Speed Mode

·       Cool Mode

·       Quiet Mode

Easy Replacement System Fan

Brightness Adjustable Front LED Indicators

Power Recovery

Noise Level*

25.2 dB(A)

Scheduled Power On / Off

Wake on LAN / WAN

Power Supply Unit / Adapter

250 W

AC Input Power Voltage

100V to 240V AC

Power Frequency

50/60 Hz, Single Phase

Power Consumption

51.22 W (Access)
25.27 W (HDD Hibernation)

British Thermal Unit

174.77 BTU/hr (Access)
86.22 BTU/hr (HDD Hibernation)

Notes

·       Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s).

·       Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%

Temperature

Operating Temperature

0°C to 40°C (32°F to 104°F)

Storage Temperature

-20°C to 60°C (-5°F to 140°F)

Relative Humidity

5% to 95% RH

Certification

·       FCC

·       CE

·       BSMI

·       EAC

·       CCC

·       KC

·       VCCI

·       RCM

Warranty

3-year hardware warranty, extendable to 5 years with Extended Warranty Plus

Notes

The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)

Environment

RoHS Compliant

Packaging Content

·       Main Unit X 1

·       Accessory Pack X 1

·       AC Power Cord X 1

·       RJ-45 LAN Cable X 2

·       Quick Installation Guide X 1

Optional Accessories

·       DDR4 ECC SODIMM: D4ES01-4G/D4ES01-8G/D4ECSO-2666-16G

·       Expansion Units: DX517

·       Enterprise Series 3.5" SATA HDD: HAT5300 Series

·       Plus Series 3.5" SATA HDD: HAT3300 Series

·       Enterprise Series 2.5" SATA SSD: SAT5200 Series

·       Enterprise Series M.2 2280 NVMe SSD: SNV3400 Series

·       25GbE Network Interface Card: E25G30-F2

·       10GbE Network Interface Card: E10G21-F2/E10G30-T2/E10G18-T1

DSM Specifications

Storage Management

Maximum Single Volume Size

108 TB

Maximum Internal Volume Number

64

M.2 SSD Storage Pool Support*

SSD Read / Write Cache (White Paper)

SSD TRIM

Supported RAID Type

·       Synology Hybrid RAID

·       Basic

·       JBOD

·       RAID 0

·       RAID 1

·       RAID 5

·       RAID 6

·       RAID 10

RAID Migration

·       Basic to RAID 1

·       Basic to RAID 5

·       RAID 1 to RAID 5

·       RAID 5 to RAID 6

Volume Expansion with Larger HDDs

·       Synology Hybrid RAID

·       RAID 1

·       RAID 5

·       RAID 6

·       RAID 10

Volume Expansion by Adding a HDD

·       Synology Hybrid RAID

·       JBOD

·       RAID 5

·       RAID 6

Global Hot Spare Supported RAID Type

·       Synology Hybrid RAID

·       RAID 1

·       RAID 5

·       RAID 6

·       RAID 10

Notes

·       Creating M.2 storage pools requires the use of Synology-verified SSDs, which are rigorously tested under extreme temperature conditions. Thermal parameters for SSDs and NAS units are fine-tuned to ensure optimal management of thermal conditions under I/O-intensive environments.

·       Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored.

·       Each internal volume (may consist of multiple drives) is expandable up to 108TB.

File System

Internal Drives

·       Btrfs

·       ext4

External Drives

·       Btrfs

·       ext4

·       ext3

·       FAT

·       NTFS

·       HFS+

·       exFAT

Notes

exFAT Access can be installed for free from Package Center in DSM 7.0. In DSM 6.2 or earlier versions, exFAT Access needs to be purchased in Package Center.

File Services

File Protocol

·       SMB

·       AFP

·       NFS

·       FTP

·       WebDAV

·       Rsync

Maximum Concurrent SMB/AFP/FTP Connections

1,000

Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion)

2,000

Windows Access Control List (ACL) Integration

NFS Kerberos Authentication

Notes

·       Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM.

·       The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.

Account & Shared Folder

Maximum Local User Accounts

2,048

Maximum Local Groups

256

Maximum Shared Folder

512

Maximum Shared Folder Sync Tasks

16

Hybrid Share

Hybrid Share Folder Number

10

Hyper Backup

Folder and Package Backup

Entire System Backup

Notes

Full-system backup requires DSM 7.2 or later.

High Availability

Synology High Availability

Log Center

Syslog Events per Second

1,000

Virtualization

VMware ESXi 6.5 and VAAI

Windows Server 2016

Windows Server 2019

Windows Server 2022

Citrix Ready

OpenStack

General Specifications

Supported Protocols

SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV

Supported Browsers

·       Chrome

·       Firefox

·       Edge

·       Safari

Supported Language

English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文

Notes

For an updated list of supported browser versions, check the DSM Technical Specifications.

Add-on Packages view the complete package list

Antivirus by McAfee (Trial)

Central Management System

Synology Chat

Suggested Maximum Users

1,500

Suggested Concurrent Users

150

Notes

When applicable, tested systems are configured with maximum memory and set to allow the maximum number of connections.

Download Station

Maximum Concurrent Download Tasks

80

SAN Manager

Maximum iSCSI Target Number

128

Maximum LUN

256

LUN Clone/Snapshot, Windows ODX

Notes

iSCSI Manager has been renamed to SAN Manager in DSM 7.0.

Synology MailPlus / MailPlus Server

Free Email Accounts

5 (Additional accounts require purchase of licenses)

Suggested Maximum Users

750

Suggested Concurrent Users

150

Maximum Server Performance

1,484,000 emails per day, approx. 45GB

Notes

·       Models with more than 4 bays were installed with two SSDs for SSD cache.

·       For tested models with expandable memory, the maximum amount of RAM was installed.

·       The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.

·       Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only).

Media Server

DLNA Compliance

Synology Photos

Facial Recognition

Object Recognition

Snapshot Replication

Maximum Snapshots per Shared Folder

1,024

Maximum of System Snapshots

65,536

Surveillance Station

Default Licenses

2 (Additional cameras require purchase of licenses)

Maximum IP Cameras and Total FPS (H.264)

·       720p: 40 channels, 1200 FPS

·       1080p: 40 channels, 1050 FPS

·       3M: 40 channels, 600 FPS

·       5M: 40 channels, 440 FPS

·       4K: 32 channels, 320 FPS

Maximum IP Cameras and Total FPS (H.265)

·       720p: 40 channels, 1200 FPS

·       1080p: 40 channels, 1200 FPS

·       3M: 40 channels, 1120 FPS

·       5M: 40 channels, 600 FPS

·       4K: 40 channels, 480 FPS

Notes

·       Performance figures are obtained from testing conducted with the device fully populated with drives under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads.

·       Use NVR Selector to quickly find a suitable model based on your requirements.

Synology Drive

Recommended Number of Concurrent Sync Clients

550 (the number of connections that can be maintained when the recommended number of hosted files was reached)

Recommended Number of Hosted Files

50,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)

Notes

·       Exceeding the recommended numbers above will not block application operations, but may result in longer response time.

·       Utilizing SSD cache can significantly improve performance.

·       For tested models with expandable memory, the maximum amount of RAM was installed.

·       Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.

Synology Office

Suggested Maximum Users

4,500

Suggested Concurrent Users

1,800

Notes

·       Multiple files were opened for testing and each file was edited by 30 users simultaneously.

·       For tested models with expandable memory, the maximum amount of RAM was installed.

·       Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM

Video Station

Virtual Machine Manager

Recommended Virtual Machine Instances

8

Recommended Virtual DSM Number (Licenses required)

8 (including 1 Free License)

Notes

The specifications vary depending on system configuration and memory size.

VPN Server

Maximum Connections

40