
Synology RS2821RP+ is a 3U 16-bay storage server designed to accommodate a diverse set of business requirements. Scalable to 28 drives, the unit provides powerful backup and restoration functionality for the SMB sector. It delivers 2,200 MB/s sequential read and 105K 4K random read performance1, and can be upgraded with SSD cache and 10/25Gb Ethernet2 options.
AMD Ryzen™ V1500B quad-core 2.2 GHz
4 GB ECC DDR4, up to 32 GB
Up to 28 drive bays with RX1217RP/RX1217
Over 105K/59K random read/write IOPS and up to 2,220/1,164 MB/s sequential read/write throughput ensure ample performance for demanding workloads.1
Reduce the possibility of power disruptions on a single distribution channel or PDU adversely impacting data and service availability.
Pair two identical devices with Synology High Availability and enable automatic minute-level failover between both devices in the event one server fails.
ECC memory prevents data corruption, while the Btrfs file system brings higher reliability, snapshot technology, and simplified data protection.
Back up files, iSCSI LUNs, installed applications, and system configurations to destinations including Synology C2 Storage, public cloud platforms, USB devices, file servers, local folders, or other Synology NAS.
Set and forget backup tasks with regular schedules, enhance security with fine-grained user permissions and encryption, keep backup sizes small with built-in deduplication4, and restore data flexibly with multi-versioning.
Snapshot Replication enables flexible point-in-time snapshots of shared folders, and virtual machines with an RPO as low as 5 minutes and recovery within seconds.
Securely back up Windows clients and servers, Microsoft 365 and Google Workspace accounts, file servers, and VMware and Hyper-V virtual machines with the Active Backup Suite.
Leverage built-in deduplication4 technology to reduce backup sizes and multi-versioning to allow flexible restoration.
Serving remote workforces
Keep your remote workforce connected with powerful out-of-the-box solutions for collaboration, file sharing, and communication.
DSM streamlines provisioning for and management of virtual machines with full certification for VMware® vSphere™, Microsoft® Hyper-V®, Citrix® XenServer™, and OpenStack virtualization environments.
Synology Storage Console for VMware or Windows platforms lets you manage storage directly from your hypervisor. VMware VAAI integration and Windows ODX help offload storage operations and speed up data transfer.
DSM Specifications
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Maximum Single Volume Size | 108 TB | |
Maximum Internal Volume Number | 64 | |
SSD Read/Write Cache (Determining cache size) | ||
SSD TRIM | ||
Supported RAID Type |
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RAID Migration |
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Volume Expansion with Larger HDDs |
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Volume Expansion by Adding a HDD |
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Global Hot Spare Supported RAID Type |
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Notes |
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Internal Drives |
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External Drives |
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Notes | exFAT Access can be installed for free from Package Center in DSM 7.0. In DSM 6.2 or earlier versions, exFAT Access needs to be purchased in Package Center. | |
File Protocol |
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Maximum Concurrent SMB/AFP/FTP Connections | 1,000 | |
Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion) | 2,000 | |
Windows Access Control List (ACL) Integration | ||
NFS Kerberos Authentication | ||
Notes |
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Maximum Local User Accounts | 2,048 | |
Maximum Local Groups | 256 | |
Maximum Shared Folder | 512 | |
Maximum Shared Folder Sync Tasks | 16 | |
Maximum Hybrid Share Folders | 10 | |
Folder and Package Backup | ||
Entire System Backup | ||
Notes | Full-system backup requires DSM 7.2 or later. | |
Synology High Availability | ||
Syslog Events per Second | 1,000 | |
Virtualization
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VMware ESXi 6.5 and VAAI | |
Windows Server 2022 | ||
Citrix Ready | ||
OpenStack | ||
Supported Protocols | SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV | |
Supported Browsers |
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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
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Suggested Users | 150 | |
Notes | Models with expandable memory are tested with their maximum supported memory. | |
Download Station
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Maximum Concurrent Download Tasks | 80 |
Maximum iSCSI Target Number | 128 | |
Maximum LUN | 256 | |
LUN Clone/Snapshot, Windows ODX | ||
Notes | iSCSI Manager has been renamed to SAN Manager in DSM 7.0. | |
Free Email Accounts | 5 (Additional accounts require purchase of licenses) | |
Suggested Users | 750 | |
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DLNA Compliance | ||
Facial Recognition | ||
Object Recognition | ||
Maximum Snapshots per Shared Folder | 1,024 | |
Maximum of System Snapshots | 65,536 | |
Default Licenses | 2 (Additional cameras require purchase of licenses) | |
Suggested Maximum IP Cameras and Total FPS (H.264) |
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Suggested Maximum IP Cameras and Total FPS (H.265) |
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Notes |
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Recommended Number of Concurrent Sync Clients | 550 (the number of connections that can be maintained when the recommended number of hosted files was reached) | |
Recommended Number of Hosted Files | 50,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above) | |
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Suggested Users | 4,500 | |
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Recommended Virtual Machine Instances | 8 (Learn more) | |
Recommended Virtual DSM Number (Licenses required) | 8 (including 1 Free License) | |
Notes | The specifications vary depending on system configuration and memory size. | |
Maximum Connections | 40 |
NAS | |
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CPU Architecture | 64-bit |
CPU Core | 4 |
CPU Frequency | 2.2 GHz |
CPU Model | AMD Ryzen V1500B |
CPU Quantity | 1 |
Drive Bays | 16 |
Expansion Port | 1 |
Form Factor (RU) | 3U |
Hardware Encryption Engine | Yes |
Hot Swappable Drive | Yes |
Maximum Memory Capacity | 32 GB (16 GB x 2) |
Memory | 4 GB DDR4 ECC UDIMM |
PCIe Expansion | 1 x Gen3 x8 slot (x4 link) |
Power Supply Unit / Adapter | 550 watts |
Redundant Power Supply | Yes |
RJ-45 1GbE LAN Port | 4 |
System Fan | 80 mm x 80 mm x 3 pcs |
Total Memory Slots | 2 |
USB 3.2 Gen 1 Port | 2 |