FlashStation FS3420 FlashStation FS3420
FlashStation FS3420 All-flash data management solution for I/O sensitive workloads.
Features Specs Accessories
Trusted by professionals across all industries.
Synology is a solid storage with great capabilities out of the box. The licensing model of all-inclusive software adds great value to the product.
Information Technology Manager - Government
Synology provides a single-platform solution for all of our backup needs in a cost effective manner.
Director of Enterprise Infrastructure - Education
Synology's DSM is a masterpiece, designed to be user-friendly even for non-IT professionals, helping us become less reliant on out IT teams.
Director Media Services - Media
Working with Synology Products has just been the best. Its an all in one product that can cater for all aspects of Storage.
Senior Systems Engineer - Media
The Synology brand is very feature-rich and unbeatable in terms of price/performance in the NAS segment. Our current testing was primarily focused on backup, which delivered reliability alongside adequate performance.
CEO - IT Services
Smooth storage server setup with intuitive OS and reliable automation features
Server Administrator - Retail
Harness all-flash storage to speed up business workflows.Download Datasheet Fast and reliableOver 169,000 random write IOPS, built-in dual-port 10GbE and up to 168 TB raw storageFlexible configurationSupports additional 10/25GbE ports, Fibre Channel adaptersand up to 192 GB of memoryVersatile business application platformEnhance productivity with collaboration tools and run containerized or virtualized workloads.Consolidate your essential workloadsFS3420 is the ideal data storage solution to power and protect your demanding workloads and data services.
Performance that drives productivityiSCSI: Random IOPS with SSD
Read: 479K+ IOPS
Write: 169K+ IOPS
Designed for reliability
Out-of-band (OOB) management Simplify troubleshooting by managing powered-down devices remotely and accessing critical logs through a dedicated interface. Redundant power Redundant power supplies ensure maximum server uptime by preventing single-point power failures. Failover cluster Maximize service continuity by pairing two identical units into a Synology High Availability cluster, ensuring automated, minute-level failover in the event of hardware failure. Synology High Availability
Flexible, high-performance network connectivityThe FS3420 supports a wide range of networking interfaces, protocols and configurations for seamless integration into enterprise environments.Built-in fast connectivityTwo 10GbE RJ-45 ports provide excellent networking performance right out of the box.Flexible networking optionsImprove I/O performance or add redundancy with optional 10GbE or 25GbE SFP+/SFP28 and 1GbE or 10GbE Ethernet NICs or Fibre Channel HBAs.Failover and network balancingBond multiple network interfaces with Link aggregation to enable automatic network failover and load balancing.
Storage efficiencyAutomated storage tieringSynology Tiering automatically moves infrequently accessed data from the FS3420 to cost-efficient tiers, balancing performance and capacity to maximize storage ROI. Flexible tiering policies, broad target support and clear visibility into data usage help you adapt quickly to changing business needs.Flash volume deduplicationVolume-wide deduplication on all-flash arrays removes redundant data, boosting storage efficiency by up to 65% for virtual desktops and virtual machines.VM Block & File StorageCertified virtualization supportDeploy and manage storage operations in various virtualization environments with certified support for VMware® vSphere™, Microsoft® Hyper-V® and Citrix® XenServer™.Block storage for KubernetesThe Synology CSI Driver for Kubernetes enables seamless provisioning and management of persistent volumes. It supports snapshots via Kubernetes native APIs and multiple access protocols, providing scalable, secure and reliable block storage for stateful Kubernetes workloads.
Logos showing certification or compatibility for Windows Server, VMware®, Citrix®, and Openstack
Container & VM hostingContainer Manager enables easy deployment and management of Docker‑based containers on Synology systems, providing scalability and simplified management for thousands of apps. For full virtualization, Virtual Machine Manager (VMM) enables Windows®, Linux® and DSM environments to run as isolated, flexible virtual machines, giving businesses the freedom to test, develop and run diverse workloads securely on a single Synology system.
Collaboration in a secure cloud, assisted by AIEnhance workplace collaboration with Synology Office Suite. Create, edit and share documents across teams in real time. Host an on-premises mail server to provide web-based email access while maintaining full data ownership. Additionally, stay connected through secure one-on-one chats, public channels, encrypted private channels and group conversations. AI assistance enhances productivity across apps, with support for leading AI providers via API key integration.Learn more
Work smarter with AIAn all-in-one private cloud productivity AI solution with smart tools and privacy controls. Learn more MailPlusDocumentSlidesSpreadsheetSummarize emails and generate smart repliesWrite and polish draftsOne-click translation of the entire presentation and annotationsAnalyze data and get formula suggestionsIntuitive storage for on-site and remote teamsProvide secure and convenient cross-platform tile access, sharing and synchronization across multiple locations.A secure private cloud solution for business collaborationA private cloud suite for file sharingEmpower your entire organization with streamlined access, sharing, and syncing of data from any location. Establish granular control over file and folder access and sharing permissions. Maintain a comprehensive audit trail of file activities and track changes to file share settings with detailed records.Learn more Multi-platform supportAccess personal and shared data from mobile apps, desktop clients, web browsers or another Synology system. Any changes you make are automatically synced to other devices as soon as they are connected.Efficient multi-site synchronizationCloud-powered multi-site syncingEmpower global workflows with high-speed access to data from anywhere in your network. Our hybrid cloud solution caches frequently used files locally for rapid access, while less frequently accessed data is stored in the cloud, reducing your on-site storage requirements.Learn more NAS-to-NAS synchronizationAutomate site-to-site data synchronization for better team workflows. Options for one-way or two-way syncing keep files and folders up-to-date across every data site.Learn more Sync to public cloud providersConnect seamlessly to public cloud services including Amazon S3, BackBlaze B2, Dropbox, Google Cloud Storage, Microsoft Azure and OpenStack Swift. Multiple protocol support, client-side encryption and customizable sync and bandwidth controls enable efficient storage management across various platforms.Learn more Comprehensive backup solutionsEndpoint, VM and NAS/SAN protectionSecurely back up a wide range of systems including Windows, Mac and Linux endpoints, VMware® and Hyper-V® virtual machines and Synology servers. Expand protection to physical servers running Windows or Linux, as well as storage solutions such as Windows Server with VSS (Volume Shadow Copy Service) and agentless file-based backup via SMB. Built-in deduplication technology optimizes storage efficiency, while multi-versioning capabilities provide flexible restoration options.Learn more Microsoft 365 and Google WorkspaceCentralize backups of Microsoft 365 and Google Workspace data to protect cloud data from accidents and simplify compliance with data retention policies. Schedulable backups, flexible file versioning and block-level deduplication ensure flexibility and storage and bandwidth savings.Advanced data protection and recoveryEfficient and reliable Synology system backupBack up entire systems or all data, applications and configurations to a wide range of storage destinations, including Synology C2 Storage. In case of data loss, quickly restore complete systems through bare-metal recovery or retrieve individual files as needed. Advanced features including automated scheduling, granular access controls, end-to-end encryption, data deduplication and multi-version retention empower you to create the optimal backup plan for your data deployment.Learn more Tamper-proof protection with immutable snapshotsSafeguard critical LUNs and shared folders with automated immutable snapshots backed by custom retention policies. Built-in support for offsite replication further ensures robust business continuity.Learn more Centralized monitoring and managementMonitor and manage your Synology fleet from a central interface, on-prem or in the cloud.Central Management SystemManage Synology servers from a central console using group policies, task delegation, batch updates and more.Learn moreActive InsightMonitor your global Synology fleet's performance, backup status, login activity and more with the power of the cloud.Learn more

Backed by Synology drives

Leverage high sustained performance and reliability with enterprise-grade drives designed specifically for Synology systems. Take advantage of advanced features such as volume-wide data deduplication, lifetime analytics and seamless firmware upgrades.

SSD
Enterprise Series 2.5" SATA
Hard drives designed for SynologySee how Synology hard drives deliver reliability, consistent performance, and simplified system management through deep hardware-software integration.Watch video Synology has you coveredThe FS3420 is backed by Synology's five-year limited warranty, including technical support and hardware replacement services to maximize your return on investment and ensure continued high-quality performance.Learn moreMore than half of Fortune 500 companies rely on Synology solutionsCarousel showcasing logos of partner companies
Find out why Hardware Overview
  • 1Power button and indicator
  • 2Status indicator
  • 3Alert indicator
  • 4Alarm silence button
  • 5Drive status indicators
  • 6Rail kit release tabs
  • 7Drive trays
  • 8PSU fans
  • 9Power ports
  • 10Mounting holes
  • 11PSU indicators
  • 12Reset button
  • 13Management port
  • 14USB 3.2 Gen 1 ports
  • 1510GbE RJ-45 ports
  • 16PCI Express expansion slots
  • First Product Image
  • Second Product Image
  • Third Product Image
  • Fourth Product Image
  • Fifth Product Image
  • Sixth Product Image
  • common.wcag_label_order_7 Product Image
Get in touchWhere to buyLearn moreAsk SynologyLearn moreNotes:Gartner® and Peer Insights™ are trademarks of Gartner, Inc. and/or its affiliates. All rights reserved. Gartner Peer Insights content consists of the opinions of individual end users based on their own experiences, and should not be construed as statements of fact, nor do they represent the views of Gartner or its affiliates. Gartner does not endorse any vendor, product or service depicted in this content nor makes any warranties, expressed or implied, with respect to this content, about its accuracy or completeness, including any warranties of merchantability or fitness for a particular purpose.Performance figures are obtained through internal testing by Synology. Actual performance may vary depending on the testing environment, usage, and configuration. See performance charts for more information.Raw capacity calculated using 7 TB drives. Usable storage capacity may vary depending on drives used and RAID configuration.Please consult our compatibility list before purchasing storage drives. For more details, please refer to this article.For the complete and most up-to-date list of compatible NICs, HBAs, and other accessories, please check our compatibility list.Flash volume deduplication is available on flash-only volumes comprised of compatible Synology SSDs. Synology measured a data reduction ratio of over 3.15:1 based on 10 VMs configured for remote desktop with two operating systems and enterprise applications installed.Certain advanced features require Virtual Machine Manager Pro. One Virtual DSM License is included. Additional Virtual DSM instances require the purchase of Virtual DSM Licenses.Five MailPlus email accounts are included. Additional email accounts can be added with the purchase of Synology MailPlus License Packs. Learn moreC2 Storage for Hyper Backup and Hybrid Share requires purchase of an eligible annual or monthly subscription. A free trial is available for each newly registered device.The warranty period starts from the date of purchase as stated on your purchase receipt. Visit https://www.synology.com/company/legal/warranty for more information.
Hardware Specs Software Specs
Hardware Specifications
CPU
CPU
 CPU Model Intel Xeon D-1739
CPU Quantity 1
CPU Cores 8
CPU Threads 16
CPU Architecture 64-bit
CPU Frequency 3.0 (base) / 3.5 (turbo) GHz
Hardware Encryption Engine
Memory
Memory
 System Memory 32 GB DDR4 ECC RDIMM
Memory Module Pre-installed 32 GB (32 GB × 1)
Total Memory Slots 6
Maximum Memory Capacity 192 GB (32 GB x 6)
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 information about recommended memory configurations, please check the Product Manual of your Synology product.
Storage
Storage
 Drive Bays 24
Drive Type (See all supported drives) 2.5" SATA SSD
Hot Swappable Drive*
Notes Compatible drives are mandatory. Please consult our compatibility list before purchasing hard drives. For more details, please refer to this article.
External Ports
External Ports
 RJ-45 10GbE LAN Port 2
Out-of-Band Management LAN Port 1
USB 3.2 Gen 1 Port 2
PCIe
PCIe
 PCIe Expansion 2 x Gen4 x8 slot (x8 link)
Appearance
Appearance
 Form Factor (RU) 2U
Size (Height x Width x Depth) 88 mm × 482 mm × 724 mm
Weight 15.0 kg
Rack Installation Support* 4-post 19" rack (Synology Rail Kit - RKS-02)
Notes The rail kit is sold separately
Others
Others
 System Fan 80 mm × 80 mm × 4 pcs
Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Easy Replacement System Fan
Power Recovery
Noise Level* 37.8 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 550 watts
Redundant Power Supply
AC Input Power Voltage 100V to 240V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption 122.0 watts (Access)
British Thermal Unit 416.02 BTU/hr (Access)
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%.
Temperature
Temperature
 Operating Temperature 0°C to 35°C (32°F to 95°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F)
Operating Humidity 8% to 80% RH
Storage Humidity 5% to 95% RH
Certification
Certification
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • CCC
  • KC
  • BIS
  • UL
Warranty
Warranty
 5 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment
Environment
 RoHS Compliant
Packaging Content
Packaging Content
  • Main Unit X 1
  • Accessory Pack X 1
  • C13 to C14 power cord X 2
  • Front Cover X 1
Optional Accessories
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.
DSM Specifications
Storage Management
Storage Management
 Maximum Single Volume Size
  • 1 PB (64 GB memory required, for RAID 6 groups only)
  • 108 TB
Maximum Internal Volume Number 32
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 Migration
  • 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
Volume Expansion by Adding a HDD
  • RAID F1
  • JBOD
  • RAID 5
  • RAID 6
Global Hot Spare Supported RAID Type
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Notes
  • 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
File System
 Internal Drives
  • Btrfs
External Drives
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
File Services
File Services
 File Protocol
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
Maximum Number of SMB Connections (FSCT-Based) 5,700
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
Account & Shared Folder
Account & Shared Folder
 Maximum Local User Accounts 10,240
Maximum Local Groups 512
Maximum Shared Folder 512
Maximum Shared Folder Sync Tasks 32
Hybrid Share
Hybrid Share
 Maximum Hybrid Share Folders 30
Hyper Backup
Hyper Backup
 Folder and Package Backup
Entire System Backup
High Availability
High Availability
 Synology High Availability
Log Center
Log Center
 Syslog Events per Second 3,000
Virtualization
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
Citrix XenServer XenServer 8.4, XenServer 8, Citrix Hypervisor 8.2 LTSR CU1
OpenStack Cinder
General Specifications
General Specifications
 Supported Protocols 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
Supported Language English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
Notes For an updated list of supported browser versions, check the DSM Technical Specifications.
Add-on Packages view the complete package list
Central Management System
Central Management System
Synology AI Console
Synology AI Console
 Third-Party AI Model Integration
Maximum De-Identification Rate 5,700 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.
Synology Chat
Synology Chat
 Maximum Number of Users 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.
SAN Manager
SAN Manager
 Maximum iSCSI Target Number 256
Maximum LUN 512
LUN Clone/Snapshot, Windows ODX
Synology MailPlus / MailPlus Server
Synology MailPlus / MailPlus Server
 Free Email Accounts 5 (Additional accounts require purchase of licenses)
Maximum Number of Users 12,000
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).
Snapshot Replication
Snapshot Replication
 Maximum Snapshots per Shared Folder 1,024
Maximum Snapshots per LUN 256
Maximum Snapshots per System 65,536
Maximum Replication Tasks for Shared Folders 128
Maximum Replication Tasks for LUNs 64
Maximum Replication Tasks per System 128
Surveillance Station
Surveillance Station
 Default Licenses 2 (Additional cameras require purchase of licenses)
Maximum IP Cameras and Total FPS (H.264)
  • 1080p: 280 channels, 2800 FPS
  • 3M: 200 channels, 2000 FPS
  • 5M: 120 channels, 1200 FPS
  • 4K: 85 channels, 850 FPS
Maximum IP Cameras and Total FPS (H.265)
  • 1080p: 285 channels, 8550 FPS
  • 3M: 280 channels, 2800 FPS
  • 5M: 200 channels, 2000 FPS
  • 4K: 120 channels, 1200 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.
  • The values above are based on testing with RTSP streaming. If SRTP is enabled for all cameras, overall performance will decrease to 70% of the stated figures.
Synology Drive
Synology Drive
 Maximum Number of Users 10,200
Maximum Number of Hosted Files 100,000,000 (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.
Synology Office
Synology Office
 Maximum Number of Users 10,000
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
Virtual Machine Manager
Virtual Machine Manager
 Recommended Virtual Machine Instances 16 (Learn more)
Recommended Virtual DSM Number (Licenses required) 16 (including 1 Free License)
Notes The specifications vary depending on system configuration and memory size.
VPN Server
VPN Server
 Maximum Connections 32
Notes: Model specifications are subject to change without prior notice. The figures are based on Synology internal testing. Each performance test is done individually. No other services or applications are processed at the same time. The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations. If usage requirements exceed the specifications above, please contact our regional partners for professional advice.
Compatible Synology Accessories
2.5" SATA SSD
Enterprise Series
  • SAT5221-480G
  • SAT5221-960G
  • SAT5221-1920G
  • SAT5221-3840G
  • SAT5210-7000G
  • E25G30-F2
  • E10G30-T2
  • E10G30-T1
  • E10G30-F2
  • E10G18-T1
D4ER03-32G
RKS-02
2.5" SATA SSD
Enterprise Series
  • SAT5221-480G
  • SAT5221-960G
  • SAT5221-1920G
  • SAT5221-3840G
  • SAT5210-7000G
  • E25G30-F2
  • E10G30-T2
  • E10G30-T1
  • E10G30-F2
  • E10G18-T1
D4ER03-32G
RKS-02
Notes: For more information about drive firmware, EOL accessories, etc, see Synology Product Compatibility list.