DiskStation DS1821+

High-capacity storage and data protection for anyone

• Synology DiskStation DS1821+ is a powerful 8-bay network-attached-storage solution designed to store and protect missioncritical data. Designed to tackle increasing amounts of unstructured data, the low-noise desktop form-factor of the DS1821+ is built for both SOHO and SMB environments. With performance over 110K or 177% higher 4K random read IOPS than its predecessor, the DS1821+ is fast, with ample room for scalability

Highlights

• Accelerated Performance 177% higher 4K random read IOPS and 76% faster sequential write speeds compared to its predecessor1
• Maximize Performance Turbocharge HDD arrays without occupying drive bays using dual built-in M.2 slots for NVMe SSD cache
• Expansion Made Easy Scale up on demand to 18 drives with two DX517 expansion units2
• Includes Everything to Protect Your Data Back up critical data from public clouds, PCs, servers, VMs, and Synology NAS with Synology Active Backup suite, Hyper Backup, and Snapshot Replication
• Ready for 10/25GbE Supports 10GbE SFP+/RJ-45 and 25GbE SFP28 NICs to instantly increase network bandwidth based on your infrastructure

Versatile Storage Powerhouse in a Single Solution

• Synology DS1821+ is designed for multi-purpose use and is suitable for a wide range of usage environments. The compact 14 L desktop formfactor makes it easy to store away whether it is at home or in a quiet office environment.
• Up to 113,458 4K random read IOPS and 2312 MB/s sequential write speeds1 for demanding workloads
• Dual M.2 2280 slots for NVMe SSD let you maximize performance and capacity efficiently4
• Features 8 bays for SATA HDD/SSD 2.5" and 3.5" drives, and can be expanded to 18 bays with two Synology DX517 expansion units

Robust Data Protection with Btrfs

• DS1821+ supports a Btrfs file system optimized by Synology to offer both high reliability and high performance. Btrfs supports advanced storage technologies that meet the needs of modern business
• Advanced snapshot technology provides schedulable and near-instantaneous data protection of shared folders and LUNs
• File and folder level data restoration offers users who wish to restore only a specific file or folder more flexibility
• Flexible Shared Folders and user quota system provides comprehensive quota control for all user accounts and shared folders
• File self-healing allows Btrfs file systems to autodetect corrupted files using mirrored metadata and to recover broken data using RAID configurations
• Inline compression compresses data before writing it to the drive, to optimize storage use and reduce write commands to the drives

 Synology Drive

• enables data access, synchronization, and backup via web portal and desktop applications across Windows®, macOS®, and Linux® platforms. Intelliversioning saves historical versions while minimizing storage space usage and supports on-demand data restoration.

Synology Office

• includes Documents, Spreadsheets, and Slides. The online collaborative editing environment allows multiple users to edit, comment on, and share data together.

Synology MailPlus

• enables you to set up a secure, reliable, and private email server, with an intuitive web-based client to boost productivity

Synology Chat

• enables instant conversations and optimizes team communications with powerful features including message encryption, pinning, forwarding, reminders, and scheduling.

Synology Calendar

• helps teams keep track of what is important, with easy to use sharing and scheduling keeping everyone on the same page.

Running & Protecting Virtual Machines

Synology Virtual Machine Manager (VMM)is a hosted hypervisor that

• lets users easily set up virtual machines running Windows® or Linux®- based platforms and a virtualized version of Synology DSM, Virtual DSM, on the DS1821+. Users can set up a cluster environment with multiple Synology systems for flexibility to perform online migration based on load balancing and resource allocation requirements. High performance snapshots, replication, cloning, and recovery mechanisms enable comprehensive management and data protection on each VM.6
• DSM also simplifies the provisioning and management of storage for virtual machines. Certified for VMware® vSphere™, Microsoft® Hyper-V®, Citrix® XenServer™, and OpenStack, Synology systems can integrate with your virtualization platform of choice through iSCSI or NFS protocols. Install Synology Storage Console for VMware/Windows for additional ease of management and functionality right in the hypervisor

Technical Specifications

Hardware

CPU

• AMD RyzenTM V1500B quad-core 2.2 GHz

Hardware encryption engine

• Yes (AES-NI)

Memory

• 4 GB DDR4 ECC SODIMM (expandable up to 32 GB)

Compatible drive types

• 8 • 8 x 3.5" or 2.5" SATA HDD/SSD (drives not included)
• 2 x M.2 2280 NVMe SSD (drives not included)

Hot swappable drives

• Yes

External ports

• 4 x USB 3.2 Gen 1
• 2 x eSATA

Size (HxWxD)

• 166 x 343 x 243 mm

Weight

• 6.0 kg

LAN ports

• 4 x 1GbE RJ-45

Wake on LAN/WAN

• Yes

PCIe 3.0 slots

• 1 x 4-lane x8 slot
• Supports 10/25GbE network interface cards³

Scheduled power on/off

• Yes

System fans

• 2 (120 x 120 x 25 mm)

AC input power voltage

• 100 V to 240 V AC

Power consumption

•  Access: 59.8 W
• HDD Hibernation: 26.18 W

Power frequency

• 50/60 Hz, single phase

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

Maximum operating altitude

• 5,000 m (16,400 ft)