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Brand: Synology
Product Code: RS2821RP+
Availability: 10
Weight: 17.10kg
Dimensions: 65.65cm x 48.20cm x 13.23cm

Synology RackStation RS2821RP+ 3U 16-Bay Rackmount NAS for SMB

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Versatile and scalable storage

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.


Compute

AMD Ryzen™ V1500B quad-core 2.2 GHz


Throughput

2,220 MB/s seq. read 105K 4K random read performance1


Memory

4 GB ECC DDR4, up to 32 GB


Scalability

Up to 28 drive bays with RX1217RP/RX1217

High performance storage for anything

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

Built for reliability

Redundant power

Near-zero downtime

Data integrity and protection

 
 

Customize to suit

Easily adapt the RS2821RP+ to any business environment by adding faster networking, local SSD cache, or storage capacity.2

 

10/25GbE ready

Support for 10/25GbE NICs lets you boost server throughput up to five times using Link Aggregation (bonding).
 

SSD cache3

 
 

On-demand drive bays

 

License-free backup solutions

 

Back up your NAS to other devices

 
 

Hyper Backup

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

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. 

 

Consolidate backups to your NAS

 
 

Active Backup Suite

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. 

consolidate

Serving remote workforces

 

Keep your remote workforce connected with powerful out-of-the-box solutions for collaboration, file sharing, and communication.

 

Synology Drive

Host your own private cloud behind the safety of your NAS with 100% data ownership and no subscription fees.
 

Synology Office

 
 

Synology Chat

 

Storage for virtualization

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
Maximum Single Volume Size 108 TB
  Maximum Internal Volume Number 64
  SSD Read/Write Cache (Determining cache size)  
  SSD TRIM  
  Supported RAID Type
  • Synology Hybrid RAID
  • 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
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  Volume Expansion by Adding a HDD
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6
  Global Hot Spare Supported RAID Type
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  Notes
  • 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.
  • Each internal volume (may consist of multiple drives) is expandable up to 108TB.
Internal Drives
  • Btrfs
  • ext4
  External Drives
  • Btrfs
  • ext4
  • ext3
  • FAT
  • NTFS
  • HFS+
  • exFAT
  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
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
  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
  • Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM.
  • The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.
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
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
  • 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.
 
Suggested Users 150
  Notes Models with expandable memory are tested with their maximum supported memory.
Download Station
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
  Notes
  • Suggested users is derived from testing in an environment with 20% heavy users (each with 20,000 pre-populated emails and receiving 240 emails per day) and 80% light users (each receiving an average of 20 emails per day). Learn more
  • The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.
  • Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only).
  • Models with expandable memory are tested with their maximum supported memory. To estimate the RAM requirement for your NAS, please read this article.
DLNA Compliance  
Facial Recognition  
  Object Recognition  
Maximum Snapshots per Shared Folder 1,024
  Maximum of System Snapshots 65,536
Default Licenses (Additional cameras require purchase of licenses)
  Suggested Maximum IP Cameras and Total FPS (H.264)
  • 1080p: 40 channels, 1050 FPS
  • 3M: 40 channels, 600 FPS
  • 5M: 40 channels, 440 FPS
  • 4K: 32 channels, 320 FPS
  Suggested Maximum IP Cameras and Total FPS (H.265)
  • 1080p: 40 channels, 1200 FPS
  • 3M: 40 channels, 1120 FPS
  • 5M: 40 channels, 600 FPS
  • 4K: 40 channels, 480 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 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.
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)
  Notes
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Utilizing SSD cache can significantly improve performance.
  • Models with expandable memory are tested with their maximum supported memory.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
Suggested Users 4,500
  Notes
  • Suggested users is derived from testing in an environment with 60% idle users (each logging in and viewing documents) and 40% active users (each executing random actions at intervals of 20 to 40 seconds) operating within documents, each document having 30 users. Learn more
  • Models with expandable memory are tested with their maximum supported memory.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
Recommended Virtual Machine Instances (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
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
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