Synology
Synology DS1621+ 6-Bay NAS DiskStation (Diskless)
★★★★★
4K
Protect and Access Your Data with the Synology DS1621+ 6-Bay NAS DiskStationThe Synology DiskStation DS1621+ is a high-performance, 6-bay network-attached storage solution designed for storing and protecting critical data assets. Featuring accelerated performance, easy expansion, and comprehensiv...
$945.92*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.
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Overview
Protect and Access Your Data with the Synology DS1621+ 6-Bay NAS DiskStation
The Synology DiskStation DS1621+ is a high-performance, 6-bay network-attached storage solution designed for storing and protecting critical data assets. Featuring accelerated performance, easy expansion, and comprehensive data protection tools, this diskless NAS is perfect for businesses and individuals needing a reliable and scalable storage solution.
- Accelerated Performance: 174% higher 4K random read IOPS and 76% faster sequential write speeds compared to its predecessor
- Maximize Performance: Turbocharge HDD arrays by 20x or more without occupying drive bays using dual built-in M.2 slots for NVMe SSD cache
- Easy Expansion: Scale-up on-demand to 16 drives with two DX517 expansion units
- Includes Everything to Protect Your Data: Back up critical data to and from public clouds, Windows PCs and servers, virtual machines, and data on the NAS with Synology Active Backup suite, Hyper Backup, and Snapshot Replication
- Ready for 10GbE: Add in a 10GbE SFP+ or RJ-45 NIC to instantly increase network bandwidth based on your existing infrastructure
Key Features
Accelerated Performance: 174% higher 4K random read IOPS and 76% faster sequential write speeds compared to its predecessor
Maximize Performance: Turbocharge HDD arrays by 20x or more without occupying drive bays using dual built-in M.2 slots for NVMe SSD cache
Easy Expansion: Scale-up on-demand to 16 drives with two DX517 expansion units
Includes Everything to Protect Your Data: Back up critical data to and from public clouds, Windows PCs and servers, virtual machines, and data on the NAS with Synology Active Backup suite, Hyper Backup, and Snapshot Replication
Ready for 10GbE: Add in a 10GbE SFP+ or RJ-45 NIC to instantly increase network bandwidth based on your existing infrastructure
Specifications
Drive Bays
6-Bay (Diskless)
Performance Increase (4K Random Read IOPS)
174% higher (vs. predecessor)
Performance Increase (Sequential Write Speed)
76% faster (vs. predecessor)
M.2 Slots
Dual built-in M.2 for NVMe SSD cache
Maximum Expandability
Up to 16 drives (with two DX517 expansion units)
Network Readiness
Ready for 10GbE (with optional NIC)
Data Protection Features
Synology Active Backup suite, Hyper Backup, Snapshot Replication
Pros & Cons
👍 Pros
- Offers significantly accelerated performance, with 174% higher 4K random read IOPS and 76% faster sequential write speeds than its predecessor.
- Maximizes performance by allowing users to turbocharge HDD arrays 20 times or more using dual built-in M.2 NVMe SSD cache slots, without occupying main drive bays.
- Features easy expansion capabilities, scaling up to 16 drives on-demand with the addition of two DX517 expansion units.
- Includes comprehensive data protection with the Synology Active Backup suite, Hyper Backup, and Snapshot Replication for various backup scenarios.
- Designed for 10GbE readiness, allowing for an instant increase in network bandwidth by adding a 10GbE SFP+ or RJ-45 NIC.
👎 Cons
- The NAS is "Diskless," meaning no hard drives are included, requiring separate purchase of storage drives.
- To achieve the "turbocharged" HDD performance, additional M.2 NVMe SSDs must be purchased separately for caching.
- Realizing the full 10GbE network benefits requires an additional 10GbE SFP+ or RJ-45 NIC, which is not included.
- The "174% higher 4K random read IOPS" and "76% faster sequential write speeds" are relative to its predecessor, not an absolute performance metric compared to all NAS devices.
- While expandable to 16 drives, this requires purchasing two DX517 expansion units, adding to the overall cost.
Frequently Asked Questions
Does the Synology DS1621+ come with hard drives installed?
No, the Synology DS1621+ is a "Diskless" NAS, meaning you will need to purchase and install your own hard drives.
How can I improve the performance of my HDD arrays with this NAS?
You can significantly turbocharge HDD arrays by 20 times or more by utilizing the dual built-in M.2 slots for NVMe SSD cache, without using primary drive bays.
Is the Synology DS1621+ expandable, and if so, how much?
Yes, this NAS offers easy expansion and can scale up to 16 drives on-demand by adding two Synology DX517 expansion units.
What data protection features are included with this DiskStation?
It includes a comprehensive suite of data protection features, such as Synology Active Backup suite, Hyper Backup, and Snapshot Replication, for backing up data from various sources.
Can this NAS support 10 Gigabit Ethernet speeds?
Yes, the Synology DS1621+ is ready for 10GbE; you can add a 10GbE SFP+ or RJ-45 NIC to instantly increase its network bandwidth based on your existing infrastructure.
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