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Comparison results

FS2500 RS3621xs+
Hardware Specs
Hardware Specifications
CPU
CPU Model AMD Ryzen V1780B Intel Xeon D-1541
CPU Quantity 1 1
CPU Core 4 8
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
Memory Module Pre-installed 8 GB (8 GB x 1) 8 GB (8 GB x 1)
Total Memory Slots 2 4
Maximum Memory Capacity 32 GB (16 GB x 2) 64 GB (16 GB x 4)
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 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 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 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 36 (RX1217 x 2)
Drive Type (See all supported drives) 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 2 2
USB 3.2 Gen 1 Port 2 2
Expansion Port 2
Expansion Port Type 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) 1U 2U
Size (Height x Width x Depth) 44 mm x 481.9 mm x 555.9 mm 88 mm x 482 mm x 724 mm
Weight 8.3 kg 14.5 kg
Rack Installation Support* 4-post 19" rack (Synology Rail Kit - RKS-01) 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 40 mm x 40 mm x 4 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* 57.6 dB(A) 50.2 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 350 watts 500 watts
550 watts*
Redundant Power Supply
AC Input Power Voltage 100V to 240V AC 100 V to 240 V AC
Power Frequency 50/60 Hz, Single Phase 50/60 Hz, Single Phase
Power Consumption 74.83 watts (Access)
 142.5 watts (Access)
72.76 watts (HDD Hibernation)
British Thermal Unit 255.17 BTU/hr (Access)
 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 GRAS 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
  • KC
  • UL
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • EAC
  • CCC
  • KC
  • BIS
  • UL
Warranty 5 Years 5 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (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 2
  • 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. 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 256 256
SSD Read/Write Cache (Determining cache size)
SSD TRIM
RAID Group
Supported RAID Type
  • RAID F1
  • 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
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Volume Expansion by Adding a HDD
  • RAID F1
  • JBOD
  • RAID 5
  • RAID 6
  • RAID F1
  • JBOD
  • RAID 5
  • RAID 6
Global Hot Spare Supported RAID Type
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Notes
  • Volumes over 108 TB require 32 GB of memory or more.
  • Actual maximum storage pool and volume sizes vary depending on drives 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 32 GB of memory or more.
  • Actual maximum storage pool and volume sizes vary depending on drives 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.
  • When Peta Volume is enabled, validated services and packages are required. Please refer to this article for more information on limitations.
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) 700 1,300
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Notes
  • 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
  • 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 2,048 5,120
Maximum Local Groups 512 512
Maximum Shared Folder 512 512
Maximum Shared Folder Sync Tasks 12 32
Hybrid Share
Hybrid Share Folder Number 15 15
Hyper Backup
Folder and Package 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 3,000 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, Fibre Channel, 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 700 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 300 500
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
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 1,600 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: 100 channels, 2800 FPS
  • 3M: 100 channels, 1200 FPS
  • 5M: 70 channels, 700 FPS
  • 4K: 50 channels, 500 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: 100 channels, 3000 FPS
  • 3M: 100 channels, 2400 FPS
  • 5M: 100 channels, 1300 FPS
  • 4K: 80 channels, 800 FPS
  • 1080p: 90 channels, 2700 FPS
  • 3M: 90 channels, 2250 FPS
  • 5M: 90 channels, 1500 FPS
  • 4K: 90 channels, 1080 FPS
Notes
  • 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 1,300 2,400
Maximum Number of Hosted Files 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) 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 1,300 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
FS2500 AMD Ryzen V1780B
RS3621xs+ Intel Xeon D-1541
CPU Quantity
FS2500 1
RS3621xs+ 1
CPU Core
FS2500 4
RS3621xs+ 8
CPU Architecture
FS2500 64-bit
RS3621xs+ 64-bit
CPU Frequency
FS2500 3.35 (base) / 3.6 (turbo) GHz
RS3621xs+ 2.1 (base) / 2.7 (turbo) GHz
Hardware Encryption Engine
FS2500
RS3621xs+
Memory
System Memory
FS2500 8 GB DDR4 ECC UDIMM
RS3621xs+ 8 GB DDR4 ECC UDIMM
Memory Module Pre-installed
FS2500 8 GB (8 GB x 1)
RS3621xs+ 8 GB (8 GB x 1)
Total Memory Slots
FS2500 2
RS3621xs+ 4
Maximum Memory Capacity
FS2500 32 GB (16 GB x 2)
RS3621xs+ 64 GB (16 GB x 4)
Notes
FS2500
  • 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 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 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 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
FS2500 12
RS3621xs+ 12
Maximum Drive Bays with Expansion Unit
FS2500
RS3621xs+ 36 (RX1217 x 2)
Drive Type (See all supported drives)
FS2500 2.5" SATA SSD
RS3621xs+
  • 3.5" SATA HDD
  • 2.5" SATA SSD
Hot Swappable Drive*
FS2500
RS3621xs+
Notes
FS2500 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
FS2500 2
RS3621xs+ 4
RJ-45 10GbE LAN Port
FS2500 2
RS3621xs+ 2
USB 3.2 Gen 1 Port
FS2500 2
RS3621xs+ 2
Expansion Port
FS2500
RS3621xs+ 2
Expansion Port Type
FS2500
RS3621xs+ Infiniband
Notes
FS2500 MTU value of 1GbE LAN port has a limit of 1500.
RS3621xs+
PCIe
PCIe Expansion
FS2500 1 x Gen3 x8 slot (x4 link)
RS3621xs+ 2 x Gen3 x8 slots (x8 link)
Appearance
Form Factor (RU)
FS2500 1U
RS3621xs+ 2U
Size (Height x Width x Depth)
FS2500 44 mm x 481.9 mm x 555.9 mm
RS3621xs+ 88 mm x 482 mm x 724 mm
Weight
FS2500 8.3 kg
RS3621xs+ 14.5 kg
Rack Installation Support*
FS2500 4-post 19" rack (Synology Rail Kit - RKS-01)
RS3621xs+ 4-post 19" rack (Synology Rail Kit - RKS-02)
Notes
FS2500 The rail kit is sold separately
RS3621xs+ The rail kit is sold separately
Others
System Fan
FS2500 40 mm x 40 mm x 4 pcs
RS3621xs+ 80 mm x 80 mm x 4 pcs
Fan Speed Mode
FS2500
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
RS3621xs+
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Easy Replacement System Fan
FS2500
RS3621xs+
Power Recovery
FS2500
RS3621xs+
Noise Level*
FS2500 57.6 dB(A)
RS3621xs+ 50.2 dB(A)
Scheduled Power On / Off
FS2500
RS3621xs+
Wake on LAN / WAN
FS2500
RS3621xs+
Power Supply Unit / Adapter
FS2500 350 watts
RS3621xs+ 500 watts
550 watts*
Redundant Power Supply
FS2500
RS3621xs+
AC Input Power Voltage
FS2500 100V to 240V AC
RS3621xs+ 100 V to 240 V AC
Power Frequency
FS2500 50/60 Hz, Single Phase
RS3621xs+ 50/60 Hz, Single Phase
Power Consumption
FS2500 74.83 watts (Access)
RS3621xs+ 142.5 watts (Access)
72.76 watts (HDD Hibernation)
British Thermal Unit
FS2500 255.17 BTU/hr (Access)
RS3621xs+ 485.93 BTU/hr (Access)
248.11 BTU/hr (HDD Hibernation)
Notes
FS2500
  • 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 GRAS 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
FS2500 0°C to 35°C (32°F to 95°F)
RS3621xs+ 0°C to 35°C (32°F to 95°F)
Storage Temperature
FS2500 -20°C to 60°C (-5°F to 140°F)
RS3621xs+ -20°C to 60°C (-5°F to 140°F)
Operating Humidity
FS2500 8% to 80% RH
RS3621xs+ 8% to 80% RH
Storage Humidity
FS2500 5% to 95% RH
RS3621xs+ 5% to 95% RH
Certification
FS2500
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • KC
  • UL
RS3621xs+
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • EAC
  • CCC
  • KC
  • BIS
  • UL
Warranty
FS2500 5 Years
RS3621xs+ 5 Years
Notes
FS2500 The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
RS3621xs+ The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment
FS2500 RoHS Compliant
RS3621xs+ RoHS Compliant
Packaging Content
FS2500
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 2
  • 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
FS2500
RS3621xs+
Notes
FS2500 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+ All memory modules will operate at the maximum frequency specified by the CPU manufacturer.
Software Specs
DSM Specifications
Storage Management
Maximum Single Volume Size
FS2500
  • 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
FS2500 256
RS3621xs+ 256
SSD Read/Write Cache (Determining cache size)
FS2500
RS3621xs+
SSD TRIM
FS2500
RS3621xs+
RAID Group
FS2500
RS3621xs+
Supported RAID Type
FS2500
  • RAID F1
  • 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
FS2500
  • 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
FS2500
  • RAID F1
  • 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
FS2500
  • RAID F1
  • JBOD
  • RAID 5
  • RAID 6
RS3621xs+
  • RAID F1
  • JBOD
  • RAID 5
  • RAID 6
Global Hot Spare Supported RAID Type
FS2500
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RS3621xs+
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Notes
FS2500
  • Volumes over 108 TB require 32 GB of memory or more.
  • Actual maximum storage pool and volume sizes vary depending on drives 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.
RS3621xs+
  • Volumes over 108 TB require 32 GB of memory or more.
  • Actual maximum storage pool and volume sizes vary depending on drives 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.
  • When Peta Volume is enabled, validated services and packages are required. Please refer to this article for more information on limitations.
File System
Internal Drives
FS2500
  • Btrfs
  • ext4
RS3621xs+
  • Btrfs
  • ext4
External Drives
FS2500
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
RS3621xs+
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
File Services
File Protocol
FS2500
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
RS3621xs+
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
Maximum Number of SMB Connections (FSCT-Based)
FS2500 700
RS3621xs+ 1,300
Windows Access Control List (ACL) Integration
FS2500
RS3621xs+
NFS Kerberos Authentication
FS2500
RS3621xs+
Notes
FS2500
  • 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
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
FS2500 2,048
RS3621xs+ 5,120
Maximum Local Groups
FS2500 512
RS3621xs+ 512
Maximum Shared Folder
FS2500 512
RS3621xs+ 512
Maximum Shared Folder Sync Tasks
FS2500 12
RS3621xs+ 32
Hybrid Share
Hybrid Share Folder Number
FS2500 15
RS3621xs+ 15
Hyper Backup
Folder and Package Backup
FS2500
RS3621xs+
Entire System Backup
FS2500
RS3621xs+
Notes
FS2500 Full-system backup requires DSM 7.2 or later.
RS3621xs+ Full-system backup requires DSM 7.2 or later.
High Availability
Synology High Availability
FS2500
RS3621xs+
Log Center
FS2500
RS3621xs+
Syslog Events per Second
FS2500 3,000
RS3621xs+ 3,000
Virtualization
VMware vSphere
FS2500 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
FS2500 Windows Server 2022
RS3621xs+ Windows Server 2022, Windows Server 2019, Windows Server 2016
Citrix XenServer
FS2500 XenServer 8, Citrix Hypervisor 8.2 LTSR CU1
RS3621xs+ XenServer 8, Citrix Hypervisor 8.2 LTSR CU1
OpenStack
FS2500 Cinder
RS3621xs+ Cinder
General Specifications
Supported Protocols
FS2500 SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, Fibre Channel, 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
FS2500
  • Chrome
  • Firefox
  • Edge
  • Safari
RS3621xs+
  • Chrome
  • Firefox
  • Edge
  • Safari
Supported Language
FS2500 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
FS2500 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
FS2500
RS3621xs+
Synology AI Console
FS2500
RS3621xs+
Third-Party AI Model Integration
FS2500
RS3621xs+
Maximum De-Identification Rate
FS2500 700 words per second
RS3621xs+ 1,300 words per second
Notes
FS2500
  • 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
FS2500
RS3621xs+
Maximum Number of Users
FS2500 300
RS3621xs+ 500
Notes
FS2500
  • 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
FS2500
RS3621xs+
Maximum Concurrent Download Tasks
FS2500
RS3621xs+ 80
SAN Manager
FS2500
RS3621xs+
Maximum iSCSI Target Number
FS2500 64
RS3621xs+ 128
Maximum LUN
FS2500 128
RS3621xs+ 256
LUN Clone/Snapshot, Windows ODX
FS2500
RS3621xs+
Synology MailPlus / MailPlus Server
FS2500
RS3621xs+
Free Email Accounts
FS2500 5 (Additional accounts require purchase of licenses)
RS3621xs+ 5 (Additional accounts require purchase of licenses)
Maximum Number of Users
FS2500 1,600
RS3621xs+ 2,800
Notes
FS2500
  • 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
FS2500
RS3621xs+
DLNA Compliance
FS2500
RS3621xs+
Synology Photos
FS2500
RS3621xs+
Facial Recognition
FS2500
RS3621xs+
Object Recognition
FS2500
RS3621xs+
Snapshot Replication
FS2500
RS3621xs+
Maximum Snapshots per Shared Folder
FS2500 256
RS3621xs+ 512
Maximum Snapshots per LUN
FS2500 64
RS3621xs+ 128
Maximum Snapshots per System
FS2500 4,096
RS3621xs+ 16,384
Maximum Replication Tasks for Shared Folders
FS2500 32
RS3621xs+ 64
Maximum Replication Tasks for LUNs
FS2500 16
RS3621xs+ 32
Maximum Replication Tasks per System
FS2500 32
RS3621xs+ 64
Surveillance Station
FS2500
RS3621xs+
Default Licenses
FS2500 2 (Additional cameras require purchase of licenses)
RS3621xs+ 2 (Additional cameras require purchase of licenses)
Maximum IP Cameras and Total FPS (H.264)
FS2500
  • 1080p: 100 channels, 2800 FPS
  • 3M: 100 channels, 1200 FPS
  • 5M: 70 channels, 700 FPS
  • 4K: 50 channels, 500 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)
FS2500
  • 1080p: 100 channels, 3000 FPS
  • 3M: 100 channels, 2400 FPS
  • 5M: 100 channels, 1300 FPS
  • 4K: 80 channels, 800 FPS
RS3621xs+
  • 1080p: 90 channels, 2700 FPS
  • 3M: 90 channels, 2250 FPS
  • 5M: 90 channels, 1500 FPS
  • 4K: 90 channels, 1080 FPS
Notes
FS2500
  • 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
FS2500
RS3621xs+
Maximum Number of Users
FS2500 1,300
RS3621xs+ 2,400
Maximum Number of Hosted Files
FS2500 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)
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
FS2500
  • 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
FS2500
RS3621xs+
Maximum Number of Users
FS2500 1,300
RS3621xs+ 2,300
Notes
FS2500
  • 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
FS2500
RS3621xs+
Recommended Virtual Machine Instances
FS2500 8 (Learn more)
RS3621xs+ 16 (Learn more)
Recommended Virtual DSM Number (Licenses required)
FS2500 8 (including 1 Free License)
RS3621xs+ 16 (including 1 Free License)
Notes
FS2500 The specifications vary depending on system configuration and memory size.
RS3621xs+ The specifications vary depending on system configuration and memory size.
VPN Server
FS2500
RS3621xs+
Maximum Connections
FS2500 12
RS3621xs+ 32