Synology RackStation RS4021xs+ is a powerful 16-bay 3U storage solution designed for high throughput and data integrity, made with built-in redundant power
- Equipped with an 8-core processor and upgradable to 64 GB memory, the RS4021xs+ is capable of hosting demanding services involving virtualization, mail, office collaboration, and surveillance, to meet the unique requirements of enterprise environments
Highlights
- Accelerated Performance: Up to 234.698 random read IOPS and 6.258 MB/s sequential read performance
- Powerful Compute: Host multiple compute-intensive services with its 8-core Intel processor
- Upgradability: Two PCIe expansion slots allow for M.2 NVMe cache adapters and high-bandwidth network cards
- Redundant Power: Ensure business continuity with two redundant power supplies
- On-demand Scalability: Supports up to 40 drive bays using two RX1217(RP)
Hardware Specifications
- CPU: Intel Xeon D-1541 8-core (16-thread) 2.1 GHz, Turbo Boost up to 2.7 GHz
- Hardware encryption engine: Yes (AES-NI)
- Memory 16 GB DDR4 ECC UDIMM (expandable up to 64 GB)
- Compatible drive types:
* 16× 3.5" or 2.5" SATA HDD/SSD (drives not included)
* Only drives listed on the compatibility list can be used to create storage pools
* Only Synology SAT5200 2.5" or Synology SNV3500 series SSDs (sold reparately) can be used to create SSD caches
- Hot swappable drive: Yes
- External ports:
* 2× USB 3.2 Gen 1 ports
* 2× Expansion ports (Infiniband)
- Form factor: Rackmount 3U
- Size (H×W×D): 132.3×482×656.5 mm (with server handles)
- Weight: 17.4 kg
- LAN ports:
* 4× 1GbE RJ-45
* 2× 10GbE RJ-45
- Wake on LAN/WAN: Yes
- PCIe 3.0 slots:
* 2× 8-lane x8 slots
* Supports network interface cards2 and M.2 NVMe SSD adapter cards for SSD cache
- Scheduled power on/off: Yes
- System fans: 3× (80×80×32 mm)
- AC input power voltage: 100 V to 240 V AC
- Power frequency: 50/60 Hz, single phase
- Operating temperature: 0°C to 35°C (32°F to 95°F)
- Storage temperature: -20°C to 60°C (-5°F to 140°F)
- Relative humidity: 5% to 95% RH
- Maximum operating altitude: 5.000 m (16.400 ft)
General DSM Specification
- Networking protocols: SMB, AFP, NFS, FTP, WebDAV, CalDAV, iSCSI, Telnet, SSH, SNMP, VPN (PPTP, OpenVPN, L2TP)
- File systems:
* Internal: Btrfs, ext4
* External: Btrfs, ext4, ext3, FAT32, NTFS, HFS+, exFAT
- Supported RAID types: Synology RAID F1, Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10
- Storage management:
* Maximum single volume size: 108/200 TB10
* Maximum system snapshots: 65.536
* Maximum internal volumes: 256
- SSD cache:
* Read/write cache support
* 2.5" SATA SSD support
* M.2 NVMe SSD support
- File sharing capabilities:
* Maximum local user accounts: 16.000
* Maximum local groups: 512
* Maximum shared folders: 512
* Maximum concurrent SMB/NFS/AFP/FTP connections: 4.000
- Privileges: Windows Access Control List (ACL), application privileges
- Directory services: Connects with Windows® AD/LDAP servers enabling domain users to login via SMB/NFS/AFP/FTP/File Station using their existing credentials
- Virtualization: VMware vSphere 6.5, Microsoft Hyper-V, Citrix, OpenStack
- Security: Firewall, shared folder encryption, SMB encryption, FTP over SSL/TLS, SFTP, rsync over SSH, login auto block, Lets Encrypt support, HTTPS (customizable cipher suite)
- Supported clients: Windows 7 onwards, macOS 10.12 onwards
- Supported browsers: Chrome, Firefox, Edge, Internet Explorer 10 onwards, Safari 10 onwards, Safari (iOS 10 onwards), Chrome (Android 6.0 onwards) on tablets
Packages and Applications
FILE SERVER & SYNCHRONIZATION
- Drive: Synchronizes files across Windows, macOS, Linux, Android and iOS
- The built-in cross-platform portal allows access to data anytime and anywhere
* Maximum number of hosted files: 5.000.000
* Maximum number of concurrent connections for PC clients: 2.000
- File Station: Provides virtual drives, remote folders, Windows ACL editor, compression/extraction of archived files, bandwidth control for specific users/groups, creation of sharing links, and transfer logs
- FTP Server: Supports bandwidth control for TCP connections, custom FTP passive port ranges, anonymous FTP, FTP over TLS/SSL and SFTP protocols, network booting with TFTP and PXE support, and transfer logs
- Presto File Server: Enables high-speed data transfer over WAN through the exclusive SITA technology between Synology NAS and desktop
- Cloud Sync: Offers one or two-way synchronization with public cloud storage providers including Alibaba Cloud OSS, Amazon S3-compatible storage, Backblaze B2, Baidu Cloud, Box, Dropbox, Google Cloud Storage, Google Drive, hubiC, MegaDisk, Microsoft OneDrive, OpenStack Swift-compatible storage, Tencent COS, WebDAV servers and Yandex Disk
- Universal Search: Enables global search of applications and files
iSCSI STORAGE & VIRTUALIZATION
- iSCSI Manager:
* Maximum iSCSI targets: 256
* Maximum iSCSI LUNs: 512
* iSCSI LUN clone/snapshot support
- Virtual Machine Manager: Deploys and runs virtual machines on the Synology NAS, including Windows, Linux, and Virtual DSM
DATA PROTECTION & BACKUP SOLUTION
- Hyper Backup: Supports local backup, network backup, and data backup to public clouds
- Backup tools:
* DSM configuration backup, macOS Time Machine support, Synology Drive Client desktop application
* Shared folder sync supports a maximum of 32 tasks
- Snapshot Replication:
* Maximum number of snapshots for shared folders: 1.024
* Maximum number of replications: 64
- Synology High Availability: Reduces service downtime by combining two identical NAS into a high-availability cluster
- Active Backup for G Suite Supports backup and restoration of Google Workspace My Drive, Team Drive, Gmail, Contacts, and Calendar
- Active Backup for Microsoft 365: Supports backup and restoration of Microsoft 365 OneDrive for Business, mail, contacts, and calendar
- Active Backup for Business: An all-in-one backup solution designed for heterogeneous business IT environments. It enables IT admins to remotely manage and protect PCs, servers, and VMs from one centralized console
PRODUCTIVITY & COLLABORATION
- Collaboration tools: Users can collaborate through the instant messaging service Synology Chat, the online editor Synology Office, and the
scheduling assistant Synology Calendar
* Maximum users for Chat: 6,000
* Maximum users for Office: 3,000
* Calendar supports CalDAV and access via mobile devices
- Note Station: A note taking platform that supports rich text, note organization and versioning, encryption, sharing, media embedding, and attachments
- Synology MailPlus Server: A secure, reliable, and private mail solution featuring high-availability, load balancing, security, and filtering
- Synology MailPlus: An intuitive webmail interface for Synology MailPlus Server with customizable mail labels, filters, and user interface
MULTIMEDIA
- Moments: A feature-rich photo management application that includes AI-powered album creation from facial and subject recognition, photo editing and sharing capabilities, similar photo detection for duplicate management, auto-editing functions such as color correction and angle adjustments, and auto-selection of the best shots
- Mobile applications are available on iOS and Android devices
- Other packages: Video Station, Photo Station, Audio Station, iTunes Server
SURVEILLANCE
- Surveillance Station: Maximum IP cameras: 90, for a total of 2.700 FPS at 720p (H.264)
ALL-IN-ONE SERVERS
- Synology Directory Server: Provides a flexible and cost-effective domain controller solution
- Central Management System: Provides a single interface to manage and monitor multiple Synology NAS
- VPN Server:
* Maximum connections: 40
* Supported VPN protocols: PPTP, OpenVPN, L2TP/IPSec
- Mail Server:
* Supported Mail Server protocols: POP3, SMTP, IMAP
* LDAP/AD account support
- Mail Station: A webmail interface for Mail Server to receive emails from multiple POP3 mailboxes and SMTP servers
- Web Station: Enables hosting for up to 30 websites with support for PHP/MariaDB and 3rd-party applications
- Other packages: DNS Server, RADIUS Server, Log Center
OTHERS
- Storage Analyzer: Displays volume and quota usage, total size of files, volume usage and trends based on past usage, size of shared folders, large files, most recently modified files, and least recently accessed files
- Antivirus Essential: Provides full system scans, scheduled scans, white list customization, and auto-update of virus definitions
- iOS/Android applications: Synology Drive, Synology MailPlus, Synology Chat, Synology LiveCam, Moments, DS audio, DS photo, DS video, DS cam, DS file, DS finder, DS note
- Other packages: Additional 3rd-party packages are available in the Package Center
Environment and Packaging
- Environment safety: RoHS compliant
- Package contents:
* 1× RS4021xs+ main unit
* 1× Quick Installation Guide
* 1× Accessory pack
* 2× AC power cords
- Optional accessories:
* DDR4 ECC UDIMM: D4EC-2666-16G
* RKS1317 Rail Kit
* 10GbE Network Interface Cards: E10G18-T2/E10G18-T1/E10G17-F2
* M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1
* M.2 SSD Adapter Card: M2D20
* M.2 NVMe SSDs: SNV3500
* 2.5" SATA SSD: SAT5200
* 3.5" SATA HDD: HAT5300
* Expansion Unit: RX1217(RP)
* VisualStation units: VS960HD, VS360HD
* Virtual DSM License Pack
* MailPlus License Pack
* Surveillance Device License Pack
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