1. products list

Comparison results

RS2423+ RS3621xs+
Hardware Specs
Hardware Specifications
CPU
CPU Model AMD Ryzen V1780B Intel Xeon D-1541
CPU Quantity 1 1
CPU Cores 4 8
CPU Threads 8 16
CPU Architecture 64-bit 64-bit
CPU Frequency 3.35 (base) / 3.6 (turbo) GHz 2.1 (base) / 2.7 (turbo) GHz
Hardware Encryption Engine
Memory
System Memory 8 GB DDR4 ECC UDIMM 8 GB DDR4 ECC UDIMM
Total Memory Slots 2 4
Maximum Memory Capacity 32 GB (16 GB x 2) 64 GB (16 GB x 4)
Notes
  • Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and 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 multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
  • Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and 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 multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
Storage
Drive Bays 12 12
Maximum Drive Bays with Expansion Unit 24 (RX1223RP x 1) 36 (RX1217 x 2)
Drive Type (See all supported drives)
  • 3.5" SATA HDD
  • 2.5" SATA SSD
  • 3.5" SATA HDD
  • 2.5" SATA SSD
Hot Swappable Drive*
Notes Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability. Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability.
External Ports
RJ-45 1GbE LAN Port 2 4
RJ-45 10GbE LAN Port 1 2
USB 3.2 Gen 1 Port 2 2
Expansion Port 1 2
Expansion Port Type Mini-SAS HD Infiniband
Notes MTU value of 1GbE LAN port has a limit of 1500.
PCIe
PCIe Expansion 1 x Gen3 x8 slot (x4 link) 2 x Gen3 x8 slots (x8 link)
Appearance
Form Factor (RU) 2U 2U
Size (Height x Width x Depth) 88 mm x 482 mm x 552 mm 88 mm x 482 mm x 724 mm
Weight 11.5 kg 14.5 kg
Rack Installation Support* 4-post 19" rack (Synology Rail Kit - RKS-02) 4-post 19" rack (Synology Rail Kit - RKS-02)
Notes The rail kit is sold separately The rail kit is sold separately
Others
System Fan 60 mm x 60 mm x 3 pcs 80 mm x 80 mm x 4 pcs
Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Easy Replacement System Fan
Power Recovery
Noise Level* 52.3 dB(A) 50.2 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 500 watts 500 watts
550 watts*
Redundant Power Supply
AC Input Power Voltage 100 V to 240 V AC 100 V to 240 V AC
Power Frequency 50/60 Hz, Single Phase 50/60 Hz, Single Phase
Power Consumption 119.95 watts (Access)
46.21 watts (HDD Hibernation)		 142.5 watts (Access)
72.76 watts (HDD Hibernation)
British Thermal Unit 409.56 BTU/hr (Access)
157.78 BTU/hr (HDD Hibernation)		 485.93 BTU/hr (Access)
248.11 BTU/hr (HDD Hibernation)
Notes
  • For more information on how power consumption is measured, refer to this article.
  • Noise testing was conducted with the Synology system fully installed with Synology SATA SSDs and in an idle state. Two G.R.A.S. type 40AE microphones were placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%.
  • For more information on how power consumption is measured, refer to this article.
  • Power supply specifications vary by hardware revision. A 500 W PSU is used in devices with serial numbers containing SZR (5th to 7th digits), while a 550 W PSU is in devices with UUR and VR1 serial numbers. For more information, refer to the Product Change Notice.
  • 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 35°C (32°F to 95°F) 0°C to 35°C (32°F to 95°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F) -20°C to 60°C (-5°F to 140°F)
Operating Humidity 8% to 80% RH 8% to 80% RH
Storage Humidity 5% to 95% RH 5% to 95% RH
Certification
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • CCC
  • KC
  • UL
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • EAC
  • CCC
  • KC
  • BIS
  • UL
Warranty 3-year hardware warranty, extendable to 5 years with EW202 5 Years
Notes
  • The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
  • EW201/EW202 is only available in Asia, Africa, and Oceania. Refer to the Extended Warranty website for details on supported countries/regions. (Learn more)
 The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment RoHS Compliant RoHS Compliant
Packaging Content
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 1
  • Quick Installation Guide X 1
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 2
  • Quick Installation Guide X 1
Optional Accessories
Notes
  • For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
  • Certain items may not be available in your location. Please contact your local distributors for more information.
 All memory modules will operate at the maximum frequency specified by the CPU manufacturer.
Software Specs
DSM Specifications
Storage Management
Maximum Single Volume Size
  • 200 TB (32 GB memory required)
  • 108 TB
  • 1 PB (64 GB memory required, for RAID 6 groups only)
  • 200 TB (32 GB memory required)
  • 108 TB
Maximum Internal Volume Number 64 256
SSD Read/Write Cache (Determining cache size)
SSD TRIM
RAID Group
Supported RAID Type
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  • RAID F1
  • 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
  • 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
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Volume Expansion by Adding a HDD
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6
  • RAID F1
  • JBOD
  • RAID 5
  • RAID 6
Global Hot Spare Supported RAID Type
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Notes
  • Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration.
  • 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.
  • Volumes over 108 TB require DSM 7.2-64570 or above and 32 GB of memory or more.
  • Volumes over 108 TB require 32 GB of memory or more.
  • Certain conditions are required to support a 1 PB volume. Please refer to this article for more information.
  • Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration.
  • 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.
File System
Internal Drives
  • Btrfs
  • ext4
  • Btrfs
  • ext4
External Drives
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
File Services
File Protocol
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
Maximum Number of SMB Connections (FSCT-Based) 380 1,300
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Notes
  • Connection value of this model is tested with Synology SATA HDD fully populated and all onboard network ports
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration:
    • Test workload: HomeFolder scenario provided by the FSCT tool
    • Test duration: 600 seconds
    • Domain controller & FSCT controller: Windows Server 2022
    • FSCT clients: 8 × Windows 10 machines
    • SMB feature: Directory leasing enabled
  • Connection value of this model is tested with Synology SATA SSD fully populated and up to four 10GbE network ports
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration:
    • Test workload: HomeFolder scenario provided by the FSCT tool
    • Test duration: 600 seconds
    • Domain controller & FSCT controller: Windows Server 2022
    • FSCT clients: 8 × Windows 10 machines
    • SMB feature: Directory leasing enabled
Account & Shared Folder
Maximum Local User Accounts 1,024 5,120
Maximum Local Groups 256 512
Maximum Shared Folder 256 512
Maximum Shared Folder Sync Tasks 12 32
Hybrid Share
Hybrid Share Folder Number 10 15
Hyper Backup
Data & Folder Backup
Entire System Backup
Notes Full-system backup requires DSM 7.2 or later. Full-system backup requires DSM 7.2 or later.
High Availability
Synology High Availability
Log Center
Syslog Events per Second 1,000 3,000
Virtualization
VMware vSphere ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5 ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5
Microsoft Hyper-V Windows Server 2022 Windows Server 2022, Windows Server 2019, Windows Server 2016
Citrix XenServer XenServer 8, Citrix Hypervisor 8.2 LTSR CU1 XenServer 8, Citrix Hypervisor 8.2 LTSR CU1
OpenStack Cinder Cinder
General Specifications
Supported Protocols SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, Fibre Channel, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers
  • Chrome
  • Firefox
  • Edge
  • Safari
  • 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 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. For an updated list of supported browser versions, check the DSM Technical Specifications.
Add-on Packages view the complete package list
Central Management System
Synology AI Console
Third-Party AI Model Integration
Maximum De-Identification Rate 380 words per second 1,300 words per second
Notes
  • De-identification performance measurement: Filters for Credit Card Numbers, IBAN, Individual Taxpayer Identification Number, SSN, and Names applied to a 4,355-word English text.
  • To enable de-identification, your device must have at least 8 GB of memory and Container Manager installed.
  • De-identification performance measurement: Filters for Credit Card Numbers, IBAN, Individual Taxpayer Identification Number, SSN, and Names applied to a 4,355-word English text.
  • To enable de-identification, your device must have at least 8 GB of memory and Container Manager installed.
Synology Chat
Maximum Number of Users 150 500
Notes
  • Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
  • Models with expandable memory are tested with the maximum supported quantity installed.
Download Station
Maximum Concurrent Download Tasks 80 80
SAN Manager
Maximum iSCSI Target Number 64 128
Maximum LUN 128 256
LUN Clone/Snapshot, Windows ODX
Synology MailPlus / MailPlus Server
Free Email Accounts 5 (Additional accounts require purchase of licenses) 5 (Additional accounts require purchase of licenses)
Maximum Number of Users 790 2,800
Notes
  • The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements.
  • Operating in high-availability mode will incur additional overhead.
  • Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).
  • The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements.
  • Operating in high-availability mode will incur additional overhead.
  • Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).
Media Server
DLNA Compliance
Synology Photos
Facial Recognition
Object Recognition
Snapshot Replication
Maximum Snapshots per Shared Folder 256 512
Maximum Snapshots per LUN 64 128
Maximum Snapshots per System 4,096 16,384
Maximum Replication Tasks for Shared Folders 32 64
Maximum Replication Tasks for LUNs 16 32
Maximum Replication Tasks per System 32 64
Surveillance Station
Default Licenses 2 (Additional cameras require purchase of licenses) 2 (Additional cameras require purchase of licenses)
Maximum IP Cameras and Total FPS (H.264)
  • 1080p: 75 channels, 2100 FPS
  • 3M: 75 channels, 1500 FPS
  • 5M: 75 channels, 900 FPS
  • 4K: 55 channels, 550 FPS
  • 1080p: 90 channels, 2250 FPS
  • 3M: 90 channels, 1500 FPS
  • 5M: 90 channels, 900 FPS
  • 4K: 55 channels, 550 FPS
Maximum IP Cameras and Total FPS (H.265)
  • 1080p: 75 channels, 2250 FPS
  • 3M: 75 channels, 2250 FPS
  • 5M: 75 channels, 1500 FPS
  • 4K: 75 channels, 900 FPS
  • 1080p: 90 channels, 2700 FPS
  • 3M: 90 channels, 2250 FPS
  • 5M: 90 channels, 1500 FPS
  • 4K: 90 channels, 1080 FPS
Notes
  • Surveillance Station 9.1.3 or above is required to support the maximum IP cameras and FPS figures listed.
  • Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and 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.
  • The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution.
  • Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and 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.
  • The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution.
Synology Drive
Maximum Number of Users 680 2,400
Maximum Number of Hosted Files 5,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above) 15,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Notes
  • The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
  • The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
Synology Office
Maximum Number of Users 660 2,300
Notes
  • The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
  • The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
Virtual Machine Manager
Recommended Virtual Machine Instances 8 (Learn more) 16 (Learn more)
Recommended Virtual DSM Number (Licenses required) 8 (including 1 Free License) 16 (including 1 Free License)
Notes The specifications vary depending on system configuration and memory size. The specifications vary depending on system configuration and memory size.
VPN Server
Maximum Connections 12 32
Hardware Specs
Hardware Specifications
CPU
CPU Model
RS2423+ AMD Ryzen V1780B
RS3621xs+ Intel Xeon D-1541
CPU Quantity
RS2423+ 1
RS3621xs+ 1
CPU Cores
RS2423+ 4
RS3621xs+ 8
CPU Threads
RS2423+ 8
RS3621xs+ 16
CPU Architecture
RS2423+ 64-bit
RS3621xs+ 64-bit
CPU Frequency
RS2423+ 3.35 (base) / 3.6 (turbo) GHz
RS3621xs+ 2.1 (base) / 2.7 (turbo) GHz
Hardware Encryption Engine
RS2423+
RS3621xs+
Memory
System Memory
RS2423+ 8 GB DDR4 ECC UDIMM
RS3621xs+ 8 GB DDR4 ECC UDIMM
Total Memory Slots
RS2423+ 2
RS3621xs+ 4
Maximum Memory Capacity
RS2423+ 32 GB (16 GB x 2)
RS3621xs+ 64 GB (16 GB x 4)
Notes
RS2423+
  • Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and 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 multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
RS3621xs+
  • Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and 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 multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
Storage
Drive Bays
RS2423+ 12
RS3621xs+ 12
Maximum Drive Bays with Expansion Unit
RS2423+ 24 (RX1223RP x 1)
RS3621xs+ 36 (RX1217 x 2)
Drive Type (See all supported drives)
RS2423+
  • 3.5" SATA HDD
  • 2.5" SATA SSD
RS3621xs+
  • 3.5" SATA HDD
  • 2.5" SATA SSD
Hot Swappable Drive*
RS2423+
RS3621xs+
Notes
RS2423+ Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability.
RS3621xs+ Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability.
External Ports
RJ-45 1GbE LAN Port
RS2423+ 2
RS3621xs+ 4
RJ-45 10GbE LAN Port
RS2423+ 1
RS3621xs+ 2
USB 3.2 Gen 1 Port
RS2423+ 2
RS3621xs+ 2
Expansion Port
RS2423+ 1
RS3621xs+ 2
Expansion Port Type
RS2423+ Mini-SAS HD
RS3621xs+ Infiniband
Notes
RS2423+ MTU value of 1GbE LAN port has a limit of 1500.
RS3621xs+
PCIe
PCIe Expansion
RS2423+ 1 x Gen3 x8 slot (x4 link)
RS3621xs+ 2 x Gen3 x8 slots (x8 link)
Appearance
Form Factor (RU)
RS2423+ 2U
RS3621xs+ 2U
Size (Height x Width x Depth)
RS2423+ 88 mm x 482 mm x 552 mm
RS3621xs+ 88 mm x 482 mm x 724 mm
Weight
RS2423+ 11.5 kg
RS3621xs+ 14.5 kg
Rack Installation Support*
RS2423+ 4-post 19" rack (Synology Rail Kit - RKS-02)
RS3621xs+ 4-post 19" rack (Synology Rail Kit - RKS-02)
Notes
RS2423+ The rail kit is sold separately
RS3621xs+ The rail kit is sold separately
Others
System Fan
RS2423+ 60 mm x 60 mm x 3 pcs
RS3621xs+ 80 mm x 80 mm x 4 pcs
Fan Speed Mode
RS2423+
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
RS3621xs+
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Easy Replacement System Fan
RS2423+
RS3621xs+
Power Recovery
RS2423+
RS3621xs+
Noise Level*
RS2423+ 52.3 dB(A)
RS3621xs+ 50.2 dB(A)
Scheduled Power On / Off
RS2423+
RS3621xs+
Wake on LAN / WAN
RS2423+
RS3621xs+
Power Supply Unit / Adapter
RS2423+ 500 watts
RS3621xs+ 500 watts
550 watts*
Redundant Power Supply
RS2423+
RS3621xs+
AC Input Power Voltage
RS2423+ 100 V to 240 V AC
RS3621xs+ 100 V to 240 V AC
Power Frequency
RS2423+ 50/60 Hz, Single Phase
RS3621xs+ 50/60 Hz, Single Phase
Power Consumption
RS2423+ 119.95 watts (Access)
46.21 watts (HDD Hibernation)
RS3621xs+ 142.5 watts (Access)
72.76 watts (HDD Hibernation)
British Thermal Unit
RS2423+ 409.56 BTU/hr (Access)
157.78 BTU/hr (HDD Hibernation)
RS3621xs+ 485.93 BTU/hr (Access)
248.11 BTU/hr (HDD Hibernation)
Notes
RS2423+
  • For more information on how power consumption is measured, refer to this article.
  • Noise testing was conducted with the Synology system fully installed with Synology SATA SSDs and in an idle state. Two G.R.A.S. type 40AE microphones were placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%.
RS3621xs+
  • For more information on how power consumption is measured, refer to this article.
  • Power supply specifications vary by hardware revision. A 500 W PSU is used in devices with serial numbers containing SZR (5th to 7th digits), while a 550 W PSU is in devices with UUR and VR1 serial numbers. For more information, refer to the Product Change Notice.
  • 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
RS2423+ 0°C to 35°C (32°F to 95°F)
RS3621xs+ 0°C to 35°C (32°F to 95°F)
Storage Temperature
RS2423+ -20°C to 60°C (-5°F to 140°F)
RS3621xs+ -20°C to 60°C (-5°F to 140°F)
Operating Humidity
RS2423+ 8% to 80% RH
RS3621xs+ 8% to 80% RH
Storage Humidity
RS2423+ 5% to 95% RH
RS3621xs+ 5% to 95% RH
Certification
RS2423+
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • CCC
  • KC
  • UL
RS3621xs+
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • EAC
  • CCC
  • KC
  • BIS
  • UL
Warranty
RS2423+ 3-year hardware warranty, extendable to 5 years with EW202
RS3621xs+ 5 Years
Notes
RS2423+
  • The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
  • EW201/EW202 is only available in Asia, Africa, and Oceania. Refer to the Extended Warranty website for details on supported countries/regions. (Learn more)
RS3621xs+ The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment
RS2423+ RoHS Compliant
RS3621xs+ RoHS Compliant
Packaging Content
RS2423+
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 1
  • Quick Installation Guide X 1
RS3621xs+
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 2
  • Quick Installation Guide X 1
Optional Accessories
RS2423+
RS3621xs+
Notes
RS2423+
  • For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
  • Certain items may not be available in your location. Please contact your local distributors for more information.
RS3621xs+ All memory modules will operate at the maximum frequency specified by the CPU manufacturer.
Software Specs
DSM Specifications
Storage Management
Maximum Single Volume Size
RS2423+
  • 200 TB (32 GB memory required)
  • 108 TB
RS3621xs+
  • 1 PB (64 GB memory required, for RAID 6 groups only)
  • 200 TB (32 GB memory required)
  • 108 TB
Maximum Internal Volume Number
RS2423+ 64
RS3621xs+ 256
SSD Read/Write Cache (Determining cache size)
RS2423+
RS3621xs+
SSD TRIM
RS2423+
RS3621xs+
RAID Group
RS2423+
RS3621xs+
Supported RAID Type
RS2423+
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RS3621xs+
  • RAID F1
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RAID Migration
RS2423+
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
RS3621xs+
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
Volume Expansion with Larger HDDs
RS2423+
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RS3621xs+
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Volume Expansion by Adding a HDD
RS2423+
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6
RS3621xs+
  • RAID F1
  • JBOD
  • RAID 5
  • RAID 6
Global Hot Spare Supported RAID Type
RS2423+
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RS3621xs+
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Notes
RS2423+
  • Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration.
  • 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.
  • Volumes over 108 TB require DSM 7.2-64570 or above and 32 GB of memory or more.
RS3621xs+
  • Volumes over 108 TB require 32 GB of memory or more.
  • Certain conditions are required to support a 1 PB volume. Please refer to this article for more information.
  • Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration.
  • 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.
File System
Internal Drives
RS2423+
  • Btrfs
  • ext4
RS3621xs+
  • Btrfs
  • ext4
External Drives
RS2423+
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
RS3621xs+
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
File Services
File Protocol
RS2423+
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
RS3621xs+
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
Maximum Number of SMB Connections (FSCT-Based)
RS2423+ 380
RS3621xs+ 1,300
Windows Access Control List (ACL) Integration
RS2423+
RS3621xs+
NFS Kerberos Authentication
RS2423+
RS3621xs+
Notes
RS2423+
  • Connection value of this model is tested with Synology SATA HDD fully populated and all onboard network ports
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration:
    • Test workload: HomeFolder scenario provided by the FSCT tool
    • Test duration: 600 seconds
    • Domain controller & FSCT controller: Windows Server 2022
    • FSCT clients: 8 × Windows 10 machines
    • SMB feature: Directory leasing enabled
RS3621xs+
  • Connection value of this model is tested with Synology SATA SSD fully populated and up to four 10GbE network ports
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration:
    • Test workload: HomeFolder scenario provided by the FSCT tool
    • Test duration: 600 seconds
    • Domain controller & FSCT controller: Windows Server 2022
    • FSCT clients: 8 × Windows 10 machines
    • SMB feature: Directory leasing enabled
Account & Shared Folder
Maximum Local User Accounts
RS2423+ 1,024
RS3621xs+ 5,120
Maximum Local Groups
RS2423+ 256
RS3621xs+ 512
Maximum Shared Folder
RS2423+ 256
RS3621xs+ 512
Maximum Shared Folder Sync Tasks
RS2423+ 12
RS3621xs+ 32
Hybrid Share
Hybrid Share Folder Number
RS2423+ 10
RS3621xs+ 15
Hyper Backup
Data & Folder Backup
RS2423+
RS3621xs+
Entire System Backup
RS2423+
RS3621xs+
Notes
RS2423+ Full-system backup requires DSM 7.2 or later.
RS3621xs+ Full-system backup requires DSM 7.2 or later.
High Availability
Synology High Availability
RS2423+
RS3621xs+
Log Center
RS2423+
RS3621xs+
Syslog Events per Second
RS2423+ 1,000
RS3621xs+ 3,000
Virtualization
VMware vSphere
RS2423+ ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5
RS3621xs+ ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5
Microsoft Hyper-V
RS2423+ Windows Server 2022
RS3621xs+ Windows Server 2022, Windows Server 2019, Windows Server 2016
Citrix XenServer
RS2423+ XenServer 8, Citrix Hypervisor 8.2 LTSR CU1
RS3621xs+ XenServer 8, Citrix Hypervisor 8.2 LTSR CU1
OpenStack
RS2423+ Cinder
RS3621xs+ Cinder
General Specifications
Supported Protocols
RS2423+ SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
RS3621xs+ SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, Fibre Channel, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers
RS2423+
  • Chrome
  • Firefox
  • Edge
  • Safari
RS3621xs+
  • Chrome
  • Firefox
  • Edge
  • Safari
Supported Language
RS2423+ 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
RS3621xs+ 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
RS2423+ For an updated list of supported browser versions, check the DSM Technical Specifications.
RS3621xs+ For an updated list of supported browser versions, check the DSM Technical Specifications.
Add-on Packages view the complete package list
Central Management System
RS2423+
RS3621xs+
Synology AI Console
RS2423+
RS3621xs+
Third-Party AI Model Integration
RS2423+
RS3621xs+
Maximum De-Identification Rate
RS2423+ 380 words per second
RS3621xs+ 1,300 words per second
Notes
RS2423+
  • De-identification performance measurement: Filters for Credit Card Numbers, IBAN, Individual Taxpayer Identification Number, SSN, and Names applied to a 4,355-word English text.
  • To enable de-identification, your device must have at least 8 GB of memory and Container Manager installed.
RS3621xs+
  • De-identification performance measurement: Filters for Credit Card Numbers, IBAN, Individual Taxpayer Identification Number, SSN, and Names applied to a 4,355-word English text.
  • To enable de-identification, your device must have at least 8 GB of memory and Container Manager installed.
Synology Chat
RS2423+
RS3621xs+
Maximum Number of Users
RS2423+ 150
RS3621xs+ 500
Notes
RS2423+
  • Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
  • Models with expandable memory are tested with the maximum supported quantity installed.
RS3621xs+
  • Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
  • Models with expandable memory are tested with the maximum supported quantity installed.
Download Station
RS2423+
RS3621xs+
Maximum Concurrent Download Tasks
RS2423+ 80
RS3621xs+ 80
SAN Manager
RS2423+
RS3621xs+
Maximum iSCSI Target Number
RS2423+ 64
RS3621xs+ 128
Maximum LUN
RS2423+ 128
RS3621xs+ 256
LUN Clone/Snapshot, Windows ODX
RS2423+
RS3621xs+
Synology MailPlus / MailPlus Server
RS2423+
RS3621xs+
Free Email Accounts
RS2423+ 5 (Additional accounts require purchase of licenses)
RS3621xs+ 5 (Additional accounts require purchase of licenses)
Maximum Number of Users
RS2423+ 790
RS3621xs+ 2,800
Notes
RS2423+
  • The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements.
  • Operating in high-availability mode will incur additional overhead.
  • Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).
RS3621xs+
  • The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements.
  • Operating in high-availability mode will incur additional overhead.
  • Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).
Media Server
RS2423+
RS3621xs+
DLNA Compliance
RS2423+
RS3621xs+
Synology Photos
RS2423+
RS3621xs+
Facial Recognition
RS2423+
RS3621xs+
Object Recognition
RS2423+
RS3621xs+
Snapshot Replication
RS2423+
RS3621xs+
Maximum Snapshots per Shared Folder
RS2423+ 256
RS3621xs+ 512
Maximum Snapshots per LUN
RS2423+ 64
RS3621xs+ 128
Maximum Snapshots per System
RS2423+ 4,096
RS3621xs+ 16,384
Maximum Replication Tasks for Shared Folders
RS2423+ 32
RS3621xs+ 64
Maximum Replication Tasks for LUNs
RS2423+ 16
RS3621xs+ 32
Maximum Replication Tasks per System
RS2423+ 32
RS3621xs+ 64
Surveillance Station
RS2423+
RS3621xs+
Default Licenses
RS2423+ 2 (Additional cameras require purchase of licenses)
RS3621xs+ 2 (Additional cameras require purchase of licenses)
Maximum IP Cameras and Total FPS (H.264)
RS2423+
  • 1080p: 75 channels, 2100 FPS
  • 3M: 75 channels, 1500 FPS
  • 5M: 75 channels, 900 FPS
  • 4K: 55 channels, 550 FPS
RS3621xs+
  • 1080p: 90 channels, 2250 FPS
  • 3M: 90 channels, 1500 FPS
  • 5M: 90 channels, 900 FPS
  • 4K: 55 channels, 550 FPS
Maximum IP Cameras and Total FPS (H.265)
RS2423+
  • 1080p: 75 channels, 2250 FPS
  • 3M: 75 channels, 2250 FPS
  • 5M: 75 channels, 1500 FPS
  • 4K: 75 channels, 900 FPS
RS3621xs+
  • 1080p: 90 channels, 2700 FPS
  • 3M: 90 channels, 2250 FPS
  • 5M: 90 channels, 1500 FPS
  • 4K: 90 channels, 1080 FPS
Notes
RS2423+
  • Surveillance Station 9.1.3 or above is required to support the maximum IP cameras and FPS figures listed.
  • Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and 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.
  • The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution.
RS3621xs+
  • Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and 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.
  • The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution.
Synology Drive
RS2423+
RS3621xs+
Maximum Number of Users
RS2423+ 680
RS3621xs+ 2,400
Maximum Number of Hosted Files
RS2423+ 5,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
RS3621xs+ 15,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Notes
RS2423+
  • The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
RS3621xs+
  • The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
Synology Office
RS2423+
RS3621xs+
Maximum Number of Users
RS2423+ 660
RS3621xs+ 2,300
Notes
RS2423+
  • The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
RS3621xs+
  • The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
Virtual Machine Manager
RS2423+
RS3621xs+
Recommended Virtual Machine Instances
RS2423+ 8 (Learn more)
RS3621xs+ 16 (Learn more)
Recommended Virtual DSM Number (Licenses required)
RS2423+ 8 (including 1 Free License)
RS3621xs+ 16 (including 1 Free License)
Notes
RS2423+ The specifications vary depending on system configuration and memory size.
RS3621xs+ The specifications vary depending on system configuration and memory size.
VPN Server
RS2423+
RS3621xs+
Maximum Connections
RS2423+ 12
RS3621xs+ 32