DS920+ - Report - 😎

[dimepues]

Very happy with the performance and stability.
To echo the comments of others, many many thanks to @bb-qq for their great work :)

Note: per advice in other posted issues, you MUST use the front USB port. I had frequent stability issues that required a driver package reboot when using the back port.

TL:DR on performance

Performance was largely dependent on the USB bus / adapter bandwidth, how busy the devices are, and caching. Performance was generally in the 1.2-1.4Gbps range with either my 2 x HDDs in RAID1 or older SSD drives in RAID0

Equipment list

Synology DS20+

RAM

• 8GB RAM - built in soldered 4GB + official sinology 4GB memory kit

SSD Cache (Read-only)

• Samsung (MZ-V7S1T0B/AM) 970 EVO Plus SSD 1TB - M.2 NVMe

Storage and Volumes

• VOLUME 1 - 2 x Seagate Ironwolf 12TB (ST12000VN0008)
  ** SHR-2 (mirrored)
  ** File system (NAS): Btrfs
• VOLUME 2 - 2 x Samsung 850 EVO 250GB
  ** RAID0 (striped)
  ** File system: Btrfs
• StarTech.com 5GbE USB A to Ethernet Adapter SUB3.1 (US5GA30)
• File system: Btrfs
• MTU 9000 on USB 5GbE interface

Host

Hardware

• HP EliteDesk G4 800 with Intel i5 8500T 32GB RAM micro desktop

OS:

• Windows Server 2019 Datacenter w/ Hyper-V role

Host \ VM storage:

• Samsung SSD 970 EVO Plus 1TB NVMe
• File system: NTFS

Host connectivity:

• StarTech.com 5GbE USB A to Ethernet Adapter SUB3.1 (US5GA30)
  **
  ** MTU 9000 on virtual switch (not shared with host)
  ** SR-IOV enabled on virtual switch
  ** Driver 1.8.0.0 5/13/2019
  ** Thermal throttling disabled in settings

Guest

Specs:

• 2 vCPU and 4GB RAM (dynamic)

OS:

• Windows Server 2019 Datacenter

Guest storage:

• iSCSI target mounted using Windows iSCSI initiator
• File system: ReFS

Guest connectivity:

• StarTech.com 5GbE USB A to Ethernet Adapter SUB3.1 (US5GA30)
  ** MTU not set in guest

Networking

• QNAP qsw-m408-4c switch with 4 10GB combo 100Mb/1Gb/2.5Gb/5Gb/10GbE fiber / copper ports
  ** Untagged VLAN configured for 5GbE ports
  ** clients connected at 5Gb/s
• CAT 7 ethernet

The interface was very unstable on the back USB port (direct connected or via Hub so I could connect my UPS)
Stability is great now that I am using the front port

Performance

Performance was largely dependent on the USB bus / adapter bandwidth, how busy the devices are, and caching. Performance was generally in the 1.2-1.4Gbps range with either my HDD or, albeit older, SSD drives in RAID0

• Single Client VM - Windows File transfer between storage to local VM storage: 1-1.2Gbps**

• Single Client VM - Windows File transfer between storage to local VM storage (hitting the cache): up to 2.1-3Gbps**

• Single Client VM - Windows File transfer between storage to local VM storage (hitting the cache): up to 2.1-3Gbps**

• Multiple Client VMs - Simultaneous Windows File transfer between storage to local VM storage (hitting the cache): up to ~1.4Gbps - 1.5Gbps**

**AJA : 145MBps (most prevalent( - 195MBps (cached) write / 150-344MBps (cached) write

[jpalmucci]

+1. Works great on mine too. As long as you are plugged into the front USB port. When I had it plugged into the back, I'd lose the network connection every 2-3 days and had to stop and start the package to get it back. (Sabrent NT-SS5G)