Expand the network storage capacity for your small- to medium-business or SOHO (Small Office, Home Office) environment with the Synology DS1821+ 8-Bay NAS Enclosurefrom Synology. Useful for high-speed file sharing, backups, and surveillance, this enclosure supports up to eight 3.5" and 2.5" SATA drives in RAID 0, 1, 5, 6, 10, Synology Hybrid, and JBOD modes for up to 110,000 4K random read IOPS and 2300 MB/s sequential write speeds to handle demanding workloads. Installing up to two M.2 NVMe PCIe solid-state cache drives into the available slots can boost hard drive array performance by over 20x. In addition to having four Gigabit Ethernet ports with Link Aggregation and Failover support, the PCIe 3.0 x8 slot allows you to install expansion cards such as 10GbE network adapters to further enhance performance. The DiskStation DS1821+ works with Windows 7 and macOS 10.12 or later systems, and its integrated Synology DSM operating system supports a host of applications for file management, security, and more.

Open Box Products Have a Limited 3-Year Manufacturer Warranty    8 x 3.5" / 2.5" SATA Drive Bays    2 x M.2 2280 NVMe SSD Slots    2.2 GHz AMD Ryzen V1500B Quad-Core CPU    4GB DDR4 ECC RAM    4 x Gigabit Ethernet Ports    4 x USB 3.1 Gen 1 Ports    2 x eSATA Port    RAID 0, 1, 5, 6, 10, Hybrid, JBOD    PCIe 3.0 x8 Expansion Slot    Synology DSM Operating System

The Synology DiskStation DS1821+ NAS enclosure is powered by a 2.2 GHz AMD Ryzen quad-core processor with 4GB of ECC DDR4 memory. It supports up to eight 3.5" and 2.5" SATA drives in RAID 0, 1, 5, 6, 10, Synology Hybrid, and JBOD modes with a maximum single volume size of 108TB.

Installing up to two M.2 NVMe PCIe solid-state cache drives can accelerate hard drive array performance by over 20x.

The Synology DiskStation DS1821+ includes four Gigabit Ethernet ports with Link Aggregation and Failover support. Four USB 3.1 Gen 1 ports and two eSATA ports are available for connecting external storage drives and other devices to share across the network.

A PCIe 3.0 slot is available for expansions such as 10GbE network adapters for high-speed data transfers and backups. Connecting up to two Synology DX517 5-bay expansion units to the DiskStation DS1821+ provides you with a total of 18 drive bays. Up to 32GB of memory can be installed across two SO-DIMM slots to further boost NAS performance and efficiency.

The web-based File Station tool is built with intuitive, drag-and-drop operations for fast and secure file management from Windows and Mac computers. Advanced search and filtering tools allow for easy organization and file sharing, and the DS1821+ supports AFP, FTP, iSCSI, NFS, SMB, and WebDAV protocols.

Synology iSCSI storage supports most virtualization solutions to enhance work efficiency. Support includes VMware vSphere 6 and VAAI integration to help offload storage operations and optimize computation efficiency. Additionally, Windows Offloaded Data Transfer (ODX) speeds up data transfer and migration rate and OpenStack Cinder support turns your Synology NAS into a block-based storage component.

The Synology DiskStation DS1821+ integrates a variety of backup applications to fit your needs, including Active Backup for Business, Hyper Backup, Synology Drive, and Active Backup for Microsoft 365 / G Suite.

Related Questions and Answers

Q: 1. Does this unit work with Apple Silicone Chips?

A: Yes, the Synology DiskStation DS1821+ 8-Bay NAS Enclosure is compatible with the latest Apple computers.

Q: 2. Hi there, about the Ram Memory, i could use a OWC 16gb ddr4 2666 or just the synology memory?

A: For best results with the Synology DiskStation DS1821+ 8-Bay NAS Enclosure, you should use Synology's RAM modules: D4ES01-4G, D4ES01-8G, or D4ECSO-2666-16G.

Q: 3. Does this have Hardware Encryption engine? Also will the Plex will work comfortably when streaming?

A: Yes. This Synology DiskStation DS1821+ 8-Bay NAS Enclosure, would have Hardware encryption engine (AES-NI). Plex would work great for streaming,

Q: 4. What throughput can be achieved with two pice 3 nvmes in case of a cache hit? Assuming network is 25 Gbit/s or 2x 25 Gbit/s agg.

A: With two PCIe NVMe drives in an SSD cache, the Synology DiskStation DS1821+ 8-Bay NAS Enclosure can achieve about 1 GB/s of throughput.

Q: 5. If you had let's say 6TB per slot then want to increase space, can you just replace one slot at a time with larger space, like 10TB. Can you then rebuild the raid, then replace another slot, repeat, until all slots are 10TB each?

A: You could add larger drives to the Synology DiskStation DS1821+ 8-Bay NAS Enclosure to expand its capacity overtime, however, unless you are using the NAS in a JBOD format, it is not advised to use drives of varying sizes, as you will not be able to fully utilize the capacity of the larger drives and it may lead to complications. In general, it is best to use identical drives when working with RAID."

Q: 6. Will this work with Apple computers?

A: You can use the Synology DiskStation DS1821+ 8-Bay NAS Enclosure with PC, Apple, and Linux computers.

Q: 7. Is there any drive redundancy for if one hdd fails?

A: The Synology DiskStation DS1821+ 8-Bay NAS Enclosure supports RAID 1 and 5 for instances of single drive failure, while RAID 6 would continue running with up to two drive failures.

Q: 8. What voltage is supported by the device?

A: The Synology DiskStation DS1821+ 8-Bay NAS Enclosure supports 100-240v.

Q: 9. Does the Diskstation 1821+ need a UPS that has a sine wave output? or will a cheaper one work?

A: The Synology DiskStation DS1821+ 8-Bay NAS Enclosure can work with a wide variety of sine wave and non-sine wave UPS devices.

Q: 10. Does the DS1821 support 16TB drives, specifically WD Red Pro 16Tb?

A: While the WD Red Pro is not listed as a drive that was tested with the Synology DiskStation DS1821+ 8-Bay NAS Enclosure, it will still work with the unit.