Synology release RS2821RP+

Synology release RS2821RP+


Processor model AMD Ryzen V1500B
Number of CPUs 1
Processor architecture 64-bit
Processor clock 4-core 2.2 GHz
Hardware encryption engine (AES-NI)


System memory 4 GB DDR4 ECC UDIMM
Pre-installed memory modules 4 GB (4 GB x 1)
Total memory slots 2
Maximum memory capacity 32 GB (16 GB x 2)
  • Please purchase Synology original memory modules for best compatibility and reliability. If Synology memory modules are not used to expand the memory capacity, Synology will not be able to provide complete product warranty or technical support.
  • Synology reserves the right to replace memory components with the same or higher frequency depending on the supplier’s product availability. Its compatibility and stability have passed the same rigorous testing and inspection, please feel free to use it.

Storage device

Number of Disk Slots 16
Maximum number of disk bays for installing expansion units 28 (RX1217/RX1217RP x 1)
Compatible Disk Type* (See all supported disks)
  • 3.5″ SATA HDD
  • 2.5″ SATA HDD
  • 2.5″ SATA SSD
Maximum single storage capacity* 108 TB
Disk hot swap support
  • It is strongly recommended that you install the hard drives listed in the compatibility list of this model. Using unverified hard drives may cause storage pool and storage space creation failures. Synology does not provide technical support services for devices that use unsupported components.
  • Compatible disk types refer to the types of hard disks that are confirmed to be compatible with the product after actual testing, and the maximum speed limit of non-hard disk bays
  • The internal storage space can be expanded, but the single storage space after expansion cannot exceed 108 TB.

External port

RJ-45 1GbE network port 4 (Support Link Aggregation / Failover)
USB 3.2 Gen 1 port* 2
Expansion port 1
Remarks USB-IF renamed the standard formerly known as USB 3.0 to USB 3.2 Gen 1 in 2019.


PCIe expansion 1 x Gen3 x8 slot (x4 link)

File system

Internal disk
  • Btrfs
  • EXT4
External disk
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT*
Remarks exFAT Access needs to be purchased separately from the Kit Center.


Dimensions (rack unit) 3U
Size (Height X Width X Depth) 132.3 mm x 482 mm x 656.5 mm
weight 17.1 kg
Rack installation support* Four-post 19-inch (Synology Rack Kit- RKS1317 )
Remarks Rack kit needs to be purchased separately

other projects

System fan 80 mm x 80 mm x 3 pcs
Fan mode
  • Full speed mode
  • Low temperature mode
  • Silent mode
Replaceable system fan
Automatic power recovery
Noise value* 53.5 dB(A)
Timer switch
Wake on LAN
Power supply/transformer 550 W
Dual power supply
AC input voltage 100 V to 240 V AC
Current frequency 50/60 Hz, single frequency
Power consumption power* 97.54 W (Access)
49.57 W (HDD Hibernation)
British Thermal Unit 332.61 BTU/hr (Access)
169.03 BTU/hr (HDD hibernation)
  • The power consumption test data is obtained when the Western Digital 1TB WD10EFRX hard drive is full.
  • Noise level test environment: When the Seagate 2TB ST2000VN000 hard disk is in standby mode, two GRAS Type 40AE microphones are set up at a distance of 1 meter before and after the Synology NAS; background noise level: 16.49-17.51 ​​dB(A); temperature: Celsius 24.25-25.75 degrees; humidity: 58.2-61.8%.


Operating temperature 0°C to 35°C (32°F to 95°F)
Storage temperature -20°C to 60°C (-5°F to 140°F)
Relative humidity 5% to 95% RH

Certification body

  • FCC
  • CE
  • BSMI
  • EAC
  • CCC
  • KC
  • UL
  • VCCI
  • RCM


Hardware warranty for 3 years, which can be extended to 5 years coverage- EW202
Remarks The warranty period starts from the date of purchase stated on the purchase receipt. (See more)


RoHS compliant

Package contents

  • Host X 1
  • Accessory bag X 1
  • Power cord X 2
  • Quick Installation Guide X 1

Optional accessories

  • DDR4 ECC UDIMM: D4EU01-4G / D4EC-2666-8G / D4EC-2666-16G
  • Expansion unit: RX1217 / RX1217RP
  • 3.5″ SATA HDD: HAT5300
  • 2.5″ SATA SSD: SAT5200
  • M.2 SSD & 10GbE combo adapter card: E10M20-T1
  • M.2 SSD adapter card: M2D20
  • 25GbE network interface card: E25G21-F2
  • 10GbE network interface card: E10G21-F2 / E10G18-T2 / E10G18-T1
  • Sliding rack kit: RKS1317
  • VisualStation: VS960HD / VS360HD
  • Monitoring device authorization
Remarks The memory module will operate at the maximum frequency set by the CPU manufacturer.

DSM product specifications

Storage space management

Maximum storage space 64
SSD read/write cache (White Paper)
Support RAID disk array type
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RAID configuration migration
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
Use larger hard drives to expand storage space
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Add hard drives to expand storage space
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6
Global Hot Spare supports RAID types
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10

File service

File agreement SMB/AFP/NFS/FTP/WebDAV
Maximum number of simultaneous SMB/AFP/FTP connections 1,000
Maximum number of simultaneous SMB/AFP/FTP connections (equipped with extended memory) 2,000
Windows Access Control List (ACL) integration
NFS Kerberos authentication
  • For data equipped with expanded memory, all memory slots have been tested with memory capacity up to the upper limit that can be supported.
  • The test standard is based on the maximum number of simultaneous connections supported by this model. During the test, 25% of the connections were file transfers at the same time. The transmission process only ensures that the connection is uninterrupted, and the minimum transmission speed cannot be guaranteed.

Accounts and shared folders

Maximum number of local user accounts 2,048
Maximum number of local groups 256
Maximum number of shared folders 512
Maximum shared folder synchronization task 16

High availability

Synology High Availability

Log center

Logs received per second 800

Virtualization support

VMware vSphere with VAAI
Windows Server 2016
Windows Server 2019
Citrix Ready

General specifications

Network protocol SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported browsers
  • Google Chrome
  • Firefox
  • Microsoft Edge
  • Internet Explorer 11 or above
  • Safari 13 or above
  • Safari (iOS 13.0 or above)
  • Google Chrome (Android 11.0 or above)
Supported languages English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไ긗ย, Chinese Simplified Chinese, Traditional Chinese

Antivirus by McAfee (Trial)

Central Management System

Synology Chat

Maximum number of users 1,500
  • The maximum number of simultaneous HTTP connections has been adjusted to the maximum when testing Synology Chat.
  • For models with expandable memory, the maximum capacity memory has been installed during testing.

Document Viewer

Download Station

Maximum number of download tasks 80

exFAT Access (optional)

iSCSI Manager

Maximum number of iSCSI targets 128
Maximum number of iSCSI LUNs 256
iSCSI LUN Clone/Snapshot, Windows Offload Data Transfer (ODX)

Synology MailPlus / MailPlus Server

Number of free email accounts 5 (If you want to have more email accounts, you need to purchase additional authorization)
Maximum number of simultaneous online 150
Maximum server performance 1,484,000 emails/day, about 45GB
  • All models with more than 4 hard drive bays have installed two SSDs and configured them as SSD caches.
  • For models with expandable memory, the maximum capacity memory has been installed during testing.
  • In the high-availability mode, the performance of the mail system will be slightly reduced due to the data synchronization between the two servers.
  • In all the above tests, the activated functions include: anti-spam, anti-virus, DNSBL, greylisting, content scanning, full-text search (English only).

Media Server

DLNA compatible


Face recognition
Subject identification
Automatic color correction and angle correction
Moments carefully selected

Snapshot Replication

Maximum number of snapshots supported by a single shared folder 1,024
Maximum number of system snapshots 65,536

Surveillance Station

Maximum number of camera support channels (camera authorization required) 40 (including 2 sets of free licenses) (check compatible IP cameras)
Frames per second (FPS) (H.264) 1200 FPS @ 720p (1280×720)
1050 FPS @ 1080p (1920×1080)
600 FPS @ 3M (2048×1536)
440 FPS @ 5M (2591×1944)
320 FPS @ 4K (3840×2160)
Frames per second (FPS) (H.265) 1200 FPS @ 720p (1280×720)
1200 FPS @ 1080p (1920×1080)
1120 FPS @ 3M (2048×1536)
600 FPS @ 5M (2591×1944)
480 FPS @ 4K (3840×2160)
  • Surveillance Station uses an Axis camera during the test; the recording schedule is continuous recording; the Surveillance Station is used as the real-time image source; the motion detection source is set to the camera; the real-time image and the recording use the same set of image streams.
  • The maximum number of supported channels covers devices installed on Virtual DSM.
  • Other concurrently executed services may affect the frame per second (FPS), such as using Archive Vault to perform archiving tasks.

Synology Drive

Recommended number of files 1,000,000 (Applicable to files that are indexed or belong to Synology Drive . For files accessed through other protocols, please refer to the file service in the above field)
Suggest the number of clients that can be synchronized at the same time 550 (The number of devices that can be connected at the same time when the recommended number of files to be stored is reached)
  • Exceeding the recommended quantity above will not cause the kit to stop functioning, but will only cause a longer response time.
  • Using SSD caching can significantly improve performance.
  • For models with expandable memory, the maximum capacity memory has been installed during testing.
  • The Btrfs file system and unencrypted shared folders were used in the above test.

Synology Office

Maximum number of users 1,800
  • The test opens multiple files, and each file is edited by 30 users at the same time.
  • For models with expandable memory, the maximum capacity memory has been installed during testing.
  • Client performance may affect the maximum number of simultaneous editing users. Client test computer specifications: Intel Core i3-3220 / 8GB RAM

Video Station

Virtual Machine Manager

Recommended number of virtual machines 8 (see more)
Recommended number of Virtual DSMs (authorization required) 8 (including 1 free license)
Remarks This specification varies depending on the system configuration and the amount of memory.

VPN Server

Maximum number of connections 30
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