Synology DS1821+ Direct 10GbE Connection Speed

Coming from a Drobo 8D Thunderbolt 3 direct-attached storage (DAS), I wanted to preserve the benefits of transfer speed when moving to my Synology DS1821+ network-attached storage (NAS).

My iMac Pro’s 10-gigabit ethernet (10GbE) port connects directly to the 10GbE Synology card (pictured above) with a CAT8 cable I pulled around the apartment. The two devices share a subnet, and each has its own static IP address. The Synology NAS connects to a NETGEAR Switch (via 1 GbE) which then connects to my router (all DHCP). The iMac Pro connects to the router via WiFi.

Using Blackmagic Disk Speed Test, I wanted to compare the two scenarios:

  • NAS via WiFi. The connection would be iMac Pro → WiFi 5 (5 GHz, close proximity) → router → 1 GbE switch → 1 GbE port on NAS
  • NAS via 10GbE. The connection is iMac Pro → Synology 10 GbE port via CAT8 cable with MTU 9000 “jumbo frames”

Naturally, the second option was going to be what I went with. But I wanted some objective performance numbers. 😊

First, the NAS via WiFi. An amazing write speed of 28.7 MB/s. 🤣

Just as a point of comparison, the Drobo 8D over Thunderbolt 3 with two SATA SSDs to improve performance had a write speed of 371.2 MB/s.

And finally, I tested accessing the NAS via 10GbE. I hoped the read/write speeds would be “close” to that provided by the Drobo Thunderbolt interface, especially because I loaded the Synology with two NVMe SSD cache drives. The performance was better than expected with a write speed of 901.1 MB/s! 😳

Fortunately, having this fast, direct connection with my primary workstation will allow me to run virtual machines, edit content directly off the NAS, etc.

Related Articles


Please enter your comment!
Please enter your name here

Try EchoTools - my free, iOS ultrasonography reference application!

Latest Articles