Synology DS925+
Product Specifications 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. The hot swappable drive feature is not supported by M.2 SSD slots. Compatible drives are mandatory. Please consult our compatibility list before purchasing hard drives. For more details, please refer to this article. 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 HDDs and in an idle state. Two G.R.A.S. Type 40AE microphones are 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% 3-year hardware warranty, extendable to 5 years with EW201 or Extended Warranty Plus The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) Extended Warranty Plus is only available in Europe and North America. EW201/EW202 is only available in Asia, Africa, and Oceania. For exact availability information please visit their respective websites. RoHS Compliant Volumes over 108 TB require 32 GB of memory or more. 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. Creating M.2 storage pools requires the use of Synology-verified SSDs, which are rigorously tested under extreme temperature conditions. Thermal parameters for SSDs and NAS units are fine-tuned to ensure optimal management of thermal conditions under I/O-intensive environments. (Learn more) 40 ✔ ✔ Connection value of this model is tested with Synology SATA HDD fully populated and all onboard network ports SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration: 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 For an updated list of supported browser versions, check the DSM Technical Specifications. View the complete package list ✔ 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. 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). 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 streams that can be viewed simultaneously is twice the suggested maximum number of cameras. For example, if the suggested maximum number of cameras for a model is 10 under H.264, 1080p, the model can support up to 20 streams of the same specification at the same time. 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 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 specifications vary depending on system configuration.Hardware Specs
CPU
CPU Model AMD Ryzen V1500B CPU Quantity 1 CPU Core 4 CPU Architecture 64-bit CPU Frequency 2.2 GHz Hardware Encryption Engine ✔ Memory
System Memory 4 GB DDR4 ECC SODIMM Memory Module Pre-installed 4 GB (4 GB x 1) Total Memory Slots 2 Maximum Memory Capacity 32 GB (16 GB x 2) Notes
Storage
Drive Bays 4 Maximum Drive Bays with Expansion Unit 9 (DX525 x 1) M.2 Drive Slots 2 (NVMe) Drive Type (See all supported drives) Hot Swappable Drive* ✔ Notes
External Ports
RJ-45 2.5GbE LAN Port 2 USB 3.2 Gen 1 Port 2 Expansion Port 1 Expansion Port Type USB Type-C Appearance
Size (Height x Width x Depth) 166 mm x 199 mm x 223 mm Weight 2.26 kg Others
System Fan 92 mm x 92 mm x 2 pcs Fan Speed Mode Brightness Adjustable Front LED Indicators ✔ Power and Temperature
Power
Power Recovery ✔ Noise Level* 20.5 dB(A) Scheduled Power On / Off ✔ Wake on LAN / WAN ✔ Power Supply Unit / Adapter 100 watts AC Input Power Voltage 100V to 240V AC Power Frequency 50/60 Hz, Single Phase Power Consumption* 37.91 watts (Access)
12.33 watts (HDD Hibernation)British Thermal Unit 129.27 BTU/hr (Access)
42.05 BTU/hr (HDD Hibernation)Notes
Temperature
Operating Temperature 0°C to 40°C (32°F to 104°F) Storage Temperature -20°C to 60°C (-5°F to 140°F) Relative Humidity 5% to 95% RH Certification and Warranty
Certification
Warranty
Notes
Environment and Packaging
Environment
Packaging Content
Optional Accessories
Software Specs
DSM Specifications
Storage Management
Maximum Single Volume Size 200 TB (32 GB memory required)
108 TBMaximum Internal Volume Number 32 M.2 SSD Storage Pool Support* ✔ SSD Read/Write Cache (Determining cache size) ✔ SSD TRIM ✔ Supported RAID Type
RAID Migration
Volume Expansion with Larger HDDs
Volume Expansion by Adding a HDD
Global Hot Spare Supported RAID Type
Notes
File System
Internal Drives External Drives File Services
File Protocol Maximum Number of SMB Connections (FSCT-Based) with RAM Expansion
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Notes
Account & Shared Folder
Maximum Local User Accounts 512 Maximum Local Groups 128 Maximum Shared Folder 128 Maximum Shared Folder Sync Tasks 8 Hybrid Share
Maximum Hybrid Share Folders 10 Hyper Backup
Folder and Package Backup ✔ Entire System Backup ✔ High Availability
Synology High Availability ✔ Log Center
Syslog Events per Second 800 Virtualization
VMware ESXi 6.5 and VAAI ✔ Windows Server 2022 ✔ Citrix Ready ✔ OpenStack ✔ General Specifications
Supported Protocols SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPS, FTP, SNMP, LDAP, CalDAV Supported Browsers
Supported Language
Notes
Add-on Packages
Central Management System
Synology Applications
Synology Chat
Maximum Number of Users 150 Notes
Download Station
Maximum Concurrent Download Tasks 80 SAN Manager
Maximum iSCSI Target Number 2 Maximum LUN 2 LUN Clone/Snapshot, Windows ODX ✔ Synology MailPlus / MailPlus Server
Free Email Accounts 5 (Additional accounts require purchase of licenses) Maximum Number of Users 90 Notes
Media Server
DLNA Compliance ✔ Synology Photos
Facial Recognition ✔ Object Recognition ✔ Snapshot Replication
Maximum Snapshots per Shared Folder 128 Maximum of System Snapshots 256 Surveillance Station
Default Licenses 2 (Additional cameras require purchase of licenses) Suggested Maximum IP Cameras and Total FPS (H.264)
Suggested Maximum IP Cameras and Total FPS (H.265)
Notes
Synology Drive
Maximum Number of Users 80 Maximum Number of Hosted Files 500,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above) Notes
Synology Office
Maximum Number of Users 80 Notes
Virtual Machine Manager
Recommended Virtual Machine Instances 8 (Learn more) Recommended Virtual DSM 8 (including 1 Free License) VPN Server
Maximum Connections The specifications vary depending on system configuration. Notes
