Page 1 of 1
[Help] Slow smb speed in one direction
Posted: 06 Dec 2025, 00:31
by IDG
f4-424 with 3 WD red 4TB drives operating system on a SSD
F4-424 pluged into a 2.5 GB switch
Installed open speed test on F4-424 and get 2432 up and 2425 down which is expected.
I do a file transfer on either windows PC and get 260 to 280 MB up but only 125 down. Test files are 5GB single files
It looks like download speed (read speed from NAS) is limited to 1 Gb
I have tried 2 PC's with 10g ethernet, Swapped out some ethernet cables with no difference
Any input on things to try ?
Re: [Help] Slow smb speed in one direction
Posted: 06 Dec 2025, 15:22
by TMroy
The real world transfer speed may be related to your disks performance when the network speed test showing normal.
Re: [Help] Slow smb speed in one direction
Posted: 06 Dec 2025, 23:29
by IDG
TMroy wrote: ↑06 Dec 2025, 15:22
The real world transfer speed may be related to your disks performance when the network speed test showing normal.
So would the WD red 4TB drives be limiting the read speed to 1Gb speed on the F4=424. The same type of drives in a 10 year old synology nas was faster by a bit so I was thinking there was another problem.
Re: [Help] Slow smb speed in one direction
Posted: 07 Dec 2025, 10:51
by OrionXie
IDG wrote: ↑06 Dec 2025, 23:29
The WD Red 4TB hard drive itself does not limit the read speed of the F4-424 to within 1GB. Ten years ago, NAS devices had simpler functions with no additional tasks占用 resources, which may have resulted in better speed performance. Whether the F4-424 has enabled background tasks such as data checksum verification, backup, and Docker will occupy hard drive and network resources, leading to a decrease in read speed. Additionally, whether link aggregation is configured, as well as the RAID mode you are using and the file system format, should be considered.
Re: [Help] Slow smb speed in one direction
Posted: 16 Dec 2025, 04:47
by Herewerare2024
The max access, real world, speed on 2.5g lan is about 260 to 280MBps. So the raid config would hit that even with older drives in raid 5. The copy performance is likely due to network adapter advanced settings. Receive or transmit buffers, interrupts, to name a couple. Secondary, open powershell and run the command to check smb config, status, version. On the nas set min smb2 and max smb3 checked. If you dont know the powershell commands just ask copilot or other AI suite.