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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**
+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)
Very happy with the performance and stability.
To echo the comments of others, many many thanks to @bb-qq for their great work :)
TL:DR on performance
Equipment list
Synology DS20+
Host
Guest
Networking
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
**AJA : 145MBps (most prevalent( - 195MBps (cached) write / 150-344MBps (cached) write
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