Question NAS Running Horrendously Slowly, Only from One Machine Though

[koberulz]

Was doing a couple of things with files on my NAS, which runs my media server. I think I was backing a disc up, and re-encoding a file, and possibly one or two other tasks. Anyway, it all came to a screeching halt. The encode just got stuck on 81% and sat there. There was no error about the drive being inaccessible, although for all intents and purposes it appeared to be. Eventually everything stopped responding, I rebooted. Still had the same issues. Even navigating in Windows Explorer is a "double click on a folder, go make a coffee, come back, drink the coffee, read the paper, then the folder might have opened" proposition.

Local storage is fine. Accessing the same NAS from my laptop is fine. Internet from my desktop is fine. Accessing my other NAS from my desktop is also catastrophically slow.

No idea what to try. That both NASes are affected, and that the issue only affects the desktop, indicates the NASes aren't the issue. The fact that the internet is fine (I can watch 4K on YouTube) from the desktop indicates my connection to the router is fine. I'm at a loss here.

Desktop is connected via ethernet, laptop is connected via WiFi. Both running Win10.

 

[kanewolf]

Was doing a couple of things with files on my NAS, which runs my media server. I think I was backing a disc up, and re-encoding a file, and possibly one or two other tasks. Anyway, it all came to a screeching halt. The encode just got stuck on 81% and sat there. There was no error about the drive being inaccessible, although for all intents and purposes it appeared to be. Eventually everything stopped responding, I rebooted. Still had the same issues. Even navigating in Windows Explorer is a "double click on a folder, go make a coffee, come back, drink the coffee, read the paper, then the folder might have opened" proposition.

Local storage is fine. Accessing the same NAS from my laptop is fine. Internet from my desktop is fine. Accessing my other NAS from my desktop is also catastrophically slow.

No idea what to try. That both NASes are affected, and that the issue only affects the desktop, indicates the NASes aren't the issue. The fact that the internet is fine (I can watch 4K on YouTube) from the desktop indicates my connection to the router is fine. I'm at a loss here.

Desktop is connected via ethernet, laptop is connected via WiFi. Both running Win10.

Here is a test. In windows explorer, put "\\<NAS IP ADDRESS> in the access bar at the top of explorer. Is that fast ?

 

[doolittle]

let me guess - windows on the desktop? Double-check your "network and sharing center" in your settings and make sure it's set to private network, which *should* allow the normal CIFS filesharing to work.

If not login to one of the NAS on the laptop and check out the logs in the admin interface while trying to login via the desktop.

 

[koberulz]

Here is a test. In windows explorer, put "\\<NAS IP ADDRESS> in the access bar at the top of explorer. Is that fast ?

It took 12 minutes to display the contents of the NAS.

let me guess - windows on the desktop? Double-check your "network and sharing center" in your settings and make sure it's set to private network, which *should* allow the normal CIFS filesharing to work.

If not login to one of the NAS on the laptop and check out the logs in the admin interface while trying to login via the desktop.

Network is private. Sharing works, just obscenely slowly (like, 15 minutes to open a txt file). I was literally in the middle or working with files when everything suddenly ground to a halt, so it can't be a settings thing as nothing on that front changed.

I did notice last night that when I am doing something particularly strenuous with the NAS (like trying to open a txt file), the internet slows dramatically as well.

I'm not sure what you mean about the logs. I can access the TrueNAS log just fine from the desktop machine: the web UI handles just as smoothly as it always has. I updated all the way from Angelfin to Dragonfish last night, with each one taking only a few minutes. So it's something specifically to do with Windows.

 

[lantis3]

IP address conflict?

Also check Windows Event Viewer

 

[Ralston18]

On the desktop use Task Manager, Resource Monitor, and Process Explorer (Microsoft, free) to observe system performance.

Use all three tools but only one tool at a time.

Start doing things that do not require the NAS. Keep the tool window open and simply watch to determine what system resources are being used, to what extent, and what is using any given resource.

Then, leaving the tool window open, do something that you know will make the NAS(s) run "horrendously slow".

Watch for what changes. Make take a bit of trial and error to work out a methodical and consistent observation process. Take your time - there is no need to rush.

Process Explorer:

https://learn.microsoft.com/en-us/sysinternals/downloads/process-explorer

And, in light of @lantis3 's question, try observing with each NAS individually ( the other NAS shutdown), and then with both NAS's up and running.

Objective simply being to discover what is happening when NAS performance slows.

 

[kanewolf]

It took 12 minutes to display the contents of the NAS.

What make and model NAS are we talking about?
How many files and folders are there on the top level ? \\<NAS IP ADDRESS>

 

[koberulz]

What make and model NAS are we talking about?
How many files and folders are there on the top level ? \\<NAS IP ADDRESS>

TrueNAS Scale, three folders. But it also affects my Synology DS1819+, and both boxes work absolutely fine from my laptop. I'm also having zero issues watching 4K UHD rips stored on the NASes via my NVIDIA Shield. So it's something to do with this machine.

It came good, randomly, shortly after I did that test, and is now back to being absolutely awful again. I tried opening a file a few minutes later and it's still not open.

On the desktop use Task Manager, Resource Monitor, and Process Explorer (Microsoft, free) to observe system performance.
.

That's a lot of tabs, and I'm not sure what to look at. I also can't compare to doing nothing-affecting-the-NAS because I tried opening a file an hour ago and it's still tied up doing that. CPU is fine, memory is pretty maxed out (my browser uses most of my RAM at all times anyway, so that's unlikely to be related), Network seems pretty busy. The "TCP Connections" box in Resource Monitor is basically just light green, with a small dark green bit in the very top right corner. Absolutely nothing showing on "Local Area Connection" or "Local Area Connection 3". The "Network" window shows lots of spikes heading way off the top of the graph.

 

[Ralston18]

Resource Monitor is certainly showing lots of network activity.

Which is basically the stated problem.

Now the objective is to discover what is using the network: some app, utility, or even some network device that continues to broadcast.

What about the other tests and troubleshooting? Check network speeds and performance without either NAS connected/online. Then with just one NAS and then the other NAS connected.

Sketch out a simple diagram showing all network components - any loops? Device A connected to Device B connected to Device C connected to Device D connected to Device A again. A network loop.

Pay attention to the WAN and LAN ports being used. Any network switches?

Note the IP addresses of all connected devices: there should be no duplicate IP addresses.

Make and model information for modem, router, or modem router (if combined)?

Are you making use of any onboard storage on the the router? Likely via a USB port and thumb drive. Possibly a SD Smart card.....

= = = =

Lots of tabs? Remember to use only one tool/tab at a time.

If I follow correctly, my focus would be to do the testing while on the desktop.

Pick a tool and without having launched or otherwise attempting any downloads, backups, file transfers etc. Just watch. Hopefully the network activity will be very low.

Then, leave the tool window and do something that you know slows performance. Watch for what else changes. Perhaps some other app or utility is launched.

Or something already running in the background takes over the desktops's resources when network serices are needed or being used.

Good that the laptop is not impacted. Test and compare laptop and desktop when doing network activities.

Process Explorer is a good tool to use. Note that the column headers present a small < or > pointing up or down, Clicking the column heard will sort the data and often proves helpful in finding some process that is grabbing system resources.

Take your time, be methodical keep notes. watch carefully.

Remember to run and post the full results of "ipconfig /all"

 

[koberulz]

Check network speeds and performance without either NAS connected/online. Then with just one NAS and then the other NAS connected.

Well as far as I can tell the non-NAS parts of the network are fine even with both NASes connected. If I try to do something strenuous with the NAS, like open a file, the internet can sometimes slow up for a bit, but that's the only non-NAS issue I've really noticed.

Sketch out a simple diagram showing all network components - any loops? Device A connected to Device B connected to Device C connected to Device D connected to Device A again. A network loop.

I don't believe so?

Pay attention to the WAN and LAN ports being used. Any network switches?

I don't understand what this means.

Note the IP addresses of all connected devices: there should be no duplicate IP addresses.

There aren't.

Make and model information for modem, router, or modem router (if combined)?

TP-Link AC1750, Arris CM8200.

 

[bill001g]

Have you tested the network with something more strenuous than youtube. What does speedtest say. Maybe try a large download from the internet. Something like a windows install image from microsoft will take a while and let you look at the rates. You should see the transfer speed network tab of the resource monitor.

Problem is these tests are using the web browser not microsoft file sharing so they will just confirm that other basic stuff is ok.

Can you share a file from your laptop and see if that also take time to copy over your lan.

 

[koberulz]

Can you share a file from your laptop and see if that also take time to copy over your lan.

What do you mean?

What does speedtest say.

AMS: 34.04 Mbps | 4.3 MB/s
AMS (Multi): 49.21 Mbps | 6.2 MB/s
RBX: 42.39 Mbps | 5.3 MB/s
RBX (Multi): 47.93 Mbps | 6 MB/s
LON1: 41.10 Mbps | 5.1 MB/s
LON1 (Multi): 46.76 Mbps | 5.8 MB/s
SYD1: 55.73 Mbps | 7 MB/s
SYD1 (Multi): 57.15 Mbps | 7.1 MB/s
HKG1: 54.32 Mbps | 6.8 MB/s
HKG1 (Multi): 55.70 Mbps | 7 MB/s
SGP1: 55.19 Mbps | 6.9 MB/s
SGP1 (Multi): 56.31 Mbps | 7 MB/s
SGPO1: 55.67 Mbps | 7 MB/s
SGPO1 (Multi): 55.48 Mbps | 6.9 MB/s
MUM1: 52.14 Mbps | 6.5 MB/s
MUM1 (Multi): 56.29 Mbps | 7 MB/s
JKT1: 54.86 Mbps | 6.9 MB/s
JKT1 (Multi): 55.58 Mbps | 6.9 MB/s
Cloudflare: 46.37 Mbps | 5.8 MB/s
Cloudflare (Multi): 39.79 Mbps | 5 MB/s

 

[Ralston18]

Referencing:

"Pay attention to the WAN and LAN ports being used. Any network switches? "

Wired devices must be connected to the proper ports.

Modems, for example, are connected to the router's WAN port. Other devices would use the router's LAN ports.

Is one of the NAS boxes plugged into the modem? There should not be.

Here is a typical network:

Connection path being the following line diagram where ----> represents an Ethernet cable:

ISP === (coax, DSL, fiber) ===> Modem - Arris CM8200 ---->[WAN Port] Router - TP-Link AC1750 [LAN Ports] ----> [LAN Port] ---> Wired Network devices (including switches if any)

With Switch LAN ports -----> other Wired network devices.

And Router ~~~~~ >Wireless devices.

Overall, I would expect that the NAS devices would be connected directly to the router's LAN ports., Or perhaps to the LAN ports on a switch with the switch, in turn, being connected to a router LAN port.

Feel free to edit and correct my line diagram to represent your network.

Remember to run and then post the full results of "ipconfig /all".

Very useful for troubleshooting and diagnosing problems. For example, your router has a default IP address of 192.168.1.1 which is commonly used by many routers. (Including my own Linksys router.)

If the router's IP address is different or not as expected (the addresses can be changed by end users) then knowing that can help with further troubleshooting.

Does each NAS have its' own assigned static IP address?

 

[koberulz]

Here is a typical network:

Connection path being the following line diagram where ----> represents an Ethernet cable:

ISP === (coax, DSL, fiber) ===> Modem - Arris CM8200 ---->[WAN Port] Router - TP-Link AC1750 [LAN Ports] ----> [LAN Port] ---> Wired Network devices (including switches if any)

Yeah, that's all fine. Modem into the WAN port, two NASes my desktop PC and a powerline adapter in the LAN ports. The other end of the powerline adapter is in my theater room connected to my NVIDIA Shield.


Windows IP Configuration

Host Name . . . . . . . . . . . . : myname-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Killer E2200 Gigabit Ethernet Controller
Physical Address. . . . . . . . . : 1C-1B-0D-18-B1-CA
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 192.168.0.201(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Monday, September 02, 2024 17:16:40
Lease Expires . . . . . . . . . . : Thursday, September 05, 2024 9:59:22
Default Gateway . . . . . . . . . : 192.168.0.1
DHCP Server . . . . . . . . . . . : 192.168.0.1
DNS Servers . . . . . . . . . . . : 103.86.96.100
103.86.99.100
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection 3:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : TAP-NordVPN Windows Adapter V9
Physical Address. . . . . . . . . : 00-FF-56-6F-7C-92
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

 

[Ralston18]

Modem ----> [WAN port] Router [LAN ports]:

Then, via Router LAN Ports:

- LAN port to NAS #1
- LAN port to NAS #2
-LAN port to Desktop
-LAN port to Powerline adapter ==== electrical circuit ==== Powerline adapter ----> Nvidia Shield.

Correct?

This device:

https://www.nvidia.com/en-us/shield/

IP address for NVIDIA Shield? IP addresses for other connected devices?

If the NVIDIA Shield is powered off and disconnected then does peformance still suffer?

 

[koberulz]

IP address for NVIDIA Shield? IP addresses for other connected devices?

NAS 1: 192.168.0.171
NAS 2: 192.168.0.2
Shield: 192.168.0.193
Desktop PC: 192.168.0.201
Solar Panels: 192.16.0.189
Laptop: 192.168.0.221
Unknown: 192.168.0.144
*: 192.168.0.225
*: 192.168.0.204
Smartphone: 192.168.0.133
Logitech Harmony Hub: 192.168.0.248

The two asterisk devices are literally listed as asterisks on the router's page. The unknown device is a long string of letters/numbers, and Googling it returned nothing useful.

If the NVIDIA Shield is powered off and disconnected then does peformance still suffer?

Yes.

 

[Ralston18]

Solar panels being 192.168.0.189 (typo)?

Lots to comment on. And there may be other comments and suggestions. I have no problem with that.

Those two asterisk devices: does the router show their corresponding MAC's?

MAC 's physical addresses) are six pairs of letters and numbers separted by dashes or colons.

E.g. 8C-EC-4B-7E-6D-C5 or 8c:ec:4b:7e:6d:c5

Also try to determine what that unknown device is. May not even be yours......

If you can discover more about what any of those devices are then that could prove very helpful.

There are websites that can help identify devices via the MACs. Unfortunately MACs are no longer always unique but at this point in the discovery process anything more (e.g., just the manufacturer even) that can be learned is of interest.

https://www.ipchecktool.com/tool/macfinder

That long string of numbers may also be an IPv6 address.

FYI (to show the IPv6 format):

https://en.wikipedia.org/wiki/IPv6_address

Per your "ipconfig /all" it does not appear that the desktop is using IPv6.

Is IPv6 enabled on the router?

Also on the desktop run "arp -a" via the Command Prompt.

You should see a listing of network devices. The immediate concern is those IP addresses starting with 192.168. 0. ____

Your router at 192.168.0.1 (subnet 255.255.255.0) being the DNS Gateway. Commonly used.

Each IPv4 address should have a corresponding MAC listed along with "type" listed as dynamic or static.

Match the "arp -a" results to all of your network devices. Run "ipconfig /all" and "arp -a" on the laptop as well.

Many devices list the device's MAC on some sort of sticker or name plate found on the device itself. [Note: do not climb on the roof to check solar panels. Check the documentation.]

Another interesting thing is the DNS Server Addresses shown by "ipconfig /all" : Primary and secondary both being shown as 103.86.96.100

Google's DNS servers (8.8.8.8 and 8.8.4.4) are commonly used but there are other choices.

I looked up 103.86.96.100 via "Who is" - - - > Nord VPN. And you are knowingly using Nord VPN - correct?

= = = =

Overall, both NAS's should have assigned static IP addresses outside of the DHCP IP address range allowed to the router. The NAS IP addresses should be reserved for the NAS's via the NAS's physical addresses.

Not sure about solar panels needing an IP address unless they are providing some sort of operational or performanance data to you via an app on the desktop and/or laptop.

Likewise for Logitech Harmony Hub....

That all said, what I see is that there are unkown devices on your network with IP addresses that may be doing who knows what with respect to being able to "phone home", update, send out data, etc..

And in the process grabbing and holding network resources.

 

[koberulz]

Those two asterisk devices: does the router show their corresponding MAC's?

MAC 's physical addresses) are six pairs of letters and numbers separted by dashes or colons.

E.g. 8C-EC-4B-7E-6D-C5 or 8c:ec:4b:7e:6d:c5

Also try to determine what that unknown device is. May not even be yours......

The string of letters and numbers links to Canon, which makes it my printer. One of the asterisks is Amazon, so that'll be the FireTV in the other room. The last ties to Ampak Technology, and nothing springs to mind for that one.

Is IPv6 enabled on the router?

I have no idea.

Also on the desktop run "arp -a" via the Command Prompt.

You should see a listing of network devices. The immediate concern is those IP addresses starting with 192.168. 0. ____

Your router at 192.168.0.1 (subnet 255.255.255.0) being the DNS Gateway. Commonly used.

Each IPv4 address should have a corresponding MAC listed along with "type" listed as dynamic or static.

Match the "arp -a" results to all of your network devices. Run "ipconfig /all" and "arp -a" on the laptop as well.

I don't understand this.

I looked up 103.86.96.100 via "Who is" - - - > Nord VPN. And you are knowingly using Nord VPN - correct?

It's installed, but not currently active. I vaguely recall possibly altering the DNS servers when troubleshooting issues while I was using it a while back.

Not sure about solar panels needing an IP address unless they are providing some sort of operational or performanance data to you via an app on the desktop and/or laptop.

Yes, there's a piece of monitoring software they connect to.

Likewise for Logitech Harmony Hub....

Well that one just flat out works via WiFi, that's its method of operation.

 

[Ralston18]

Run "arp /a" on the desktop. Copy and paste the full results into your next post. What needs to be done is to match the MACs listed to the various network devices that you have listed.

And to identify which device IPs are dynamic (DHCP - IP addresses can and do change) and which device IPs are static (once configured by the network admin the device IP address does not change.)

"arp -a" may not immediately find all "Internet addresses", Physical Addresses, and Type.

= = = =

Solar Panels software: can that be disabled for testing purposes? Is that software running on the desktop?

The only network device connected to the modem is the router - correct?

Do you have admin rights to the TP-LINK AC1750 router?

This router?

https://www.tp-link.com/us/user-guides/Archer-C7/conventions

Do you log in directly using a browser and the router's IP address (192.168.0.1) or do you use TP-Link's website? (http://tplinkwifi.net)

You (with the appropriate admin rights) should be able to access the router's admin screens and view a list of connected/disconnected network devices via "View Existing Devices", Chapter 8, Parental Controls.

Again continuing to look for and find out what all is on the network.

= = = =

Going back to the premise that the desktop is the issue:

Remember to look in Task Manager, Resource Monitor, and Process Explorer to discover what the desktop is doing or trying to do during the times of high network usage. Compare to laptop.

Specifically "Processes with Network Activity" and "Network Activity".

You can click the column headers to sort the data being presented.

 

[koberulz]

Run "arp /a" on the desktop. Copy and paste the full results into your next post. What needs to be done is to match the MACs listed to the various network devices that you have listed.

And to identify which device IPs are dynamic (DHCP - IP addresses can and do change) and which device IPs are static (once configured by the network admin the device IP address does not change.)

"arp -a" may not immediately find all "Internet addresses", Physical Addresses, and Type.

= = = =

Interface: 192.168.0.201 --- 0x11
Internet Address Physical Address Type
192.168.0.1 3c-84-6a-93-9b-7c dynamic
192.168.0.2 00-11-32-c8-81-f6 dynamic
192.168.0.123 dc-03-98-ff-ab-f6 dynamic
192.168.0.133 16-bd-5e-a8-62-06 dynamic
192.168.0.144 00-1e-8f-ac-21-66 dynamic
192.168.0.155 4c-44-5b-26-7c-d0 dynamic
192.168.0.171 50-eb-f6-2a-d3-a7 dynamic
192.168.0.193 48-b0-2d-37-8b-0c dynamic
192.168.0.204 90-39-5f-2b-ec-6b dynamic
192.168.0.221 94-b8-6d-e6-36-f6 dynamic
192.168.0.227 a0-a4-c5-d7-20-67 dynamic
192.168.0.229 6c-3c-7c-7a-3a-dd dynamic
192.168.0.233 6a-fa-b9-dd-d1-32 dynamic
192.168.0.248 c8-db-26-0d-52-86 dynamic
192.168.0.255 ff-ff-ff-ff-ff-ff static
224.0.0.2 01-00-5e-00-00-02 static
224.0.0.22 01-00-5e-00-00-16 static
224.0.0.251 01-00-5e-00-00-fb static
224.0.0.252 01-00-5e-00-00-fc static
239.12.255.255 01-00-5e-0c-ff-ff static
239.192.152.143 01-00-5e-40-98-8f static
239.255.255.250 01-00-5e-7f-ff-fa static
255.255.255.255 ff-ff-ff-ff-ff-ff static

Solar Panels software: can that be disabled for testing purposes? Is that software running on the desktop?

It's not installed on the desktop, never has been. I'm actually not sure it's installed anywhere at the moment TBH.

The only network device connected to the modem is the router - correct?

Yes.

Do you log in directly using a browser and the router's IP address (192.168.0.1) or do you use TP-Link's website? (http://tplinkwifi.net)

Router IP.

You (with the appropriate admin rights) should be able to access the router's admin screens and view a list of connected/disconnected network devices via "View Existing Devices", Chapter 8, Parental Controls.

Again continuing to look for and find out what all is on the network.

Lots more asterisks, except this time the MAC addresses can't be copied and have to be typed manually. Joy.

One is an old FireTV, there's another Canon which might be an older printer? One is Hon Hai Precision Ind. Co.,Ltd., which might be an iPhone? Edimax Technology Co. Ltd., another Amazon...maybe my Kindle. A LiveU I was setting up here a few years back, and Airgo Networks, Inc.

Going back to the premise that the desktop is the issue:

Remember to look in Task Manager, Resource Monitor, and Process Explorer to discover what the desktop is doing or trying to do during the times of high network usage. Compare to laptop.

Specifically "Processes with Network Activity" and "Network Activity".

You can click the column headers to sort the data being presented.

Nothing seems untoward? Chrome is at the top despite the fact that it's just sitting in the background, then Waterfox which I'm currently using, Dropbox which shouldn't be doing anything much but who knows, MBAMService just popped to the top, Spotify is up there and currently playing, GoogleDriveFS, steamwebhelper, another Chrome, but activity is pretty minuscule this far down the list.

 

[kanewolf]

One thought I had, is could you have a jumbo frames setting on your PC and NAS but have a switch that doesn't support jumbos ? That would be a host specific setting that you wouldn't have on other hosts. That can kill your performance. I have gotten bitten by that.

 

[koberulz]

One thought I had, is could you have a jumbo frames setting on your PC and NAS but have a switch that doesn't support jumbos ? That would be a host specific setting that you wouldn't have on other hosts. That can kill your performance. I have gotten bitten by that.

I have no idea what any of that means.

 

[kanewolf]

I have no idea what any of that means.

One thing that can speed up large data transfers is to set a limit greater than the standard 1500 bytes for each network transfer. Any setting greater than the standard is called "jumbo". You can set up to 9000 bytes / transfer (6x the amount of data per transfer). If you have "jumbo" frames configured on your NAS and your host, BUT your network hardware can't deal with the large network packets, you get problems. In your adapter properties on your Synology and your PC (I am not familiar with TrueNAS) you can easily see the frame size. For example on Windows you open "Network and Internet" then change adapter setttings then right click on your ethernet adapter pick properties, then configure for the hardware. Under the advanced tab, you will see the Jumbo Packet option. If it is not set to "Disabled" then you have jumbo frames enabled.

 

[koberulz]

One thing that can speed up large data transfers is to set a limit greater than the standard 1500 bytes for each network transfer. Any setting greater than the standard is called "jumbo". You can set up to 9000 bytes / transfer (6x the amount of data per transfer). If you have "jumbo" frames configured on your NAS and your host, BUT your network hardware can't deal with the large network packets, you get problems. In your adapter properties on your Synology and your PC (I am not familiar with TrueNAS) you can easily see the frame size. For example on Windows you open "Network and Internet" then change adapter setttings then right click on your ethernet adapter pick properties, then configure for the hardware. Under the advanced tab, you will see the Jumbo Packet option. If it is not set to "Disabled" then you have jumbo frames enabled.

Disabled on Windows, "Set MTU value manually" is unchecked on Synology, MTU is 1500 on the TrueNAS.

 

[kanewolf]

Disabled on Windows, "Set MTU value manually" is unchecked on Synology, MTU is 1500 on the TrueNAS.

If either end had standard frame size set, then the two devices negotiate to the standard. It sounds like that was not your problem.