question

BSR-3224 avatar image
0 Votes"
BSR-3224 asked CandyLuo-MSFT answered

Stange file copy speed behavior between Windows Server 2019

Hi. Recently when we copy file between two Windows Server 2019 using NTFS share, we see strange copy speed behavior, either speed drops to zero for couple seconds or speed decreases to low value and continues. This scenario doesn't happen in our Windows Server 2012R2/2016. Since we want to deploy MSSQL always on in these production servers we concern this behavior might affect always on synchronization process.
What do you recommend?

windows-server
5 |1600 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

CandyLuo-MSFT avatar image
0 Votes"
CandyLuo-MSFT answered

Hi,

Please use the following command to check whether receive segment coalescing (RSC) is enabled on your Server 2019 : Get-NetAdapterRsc * | FL

If it was enabled, please run the following command to disable it: Disable-NetAdapterRsc *

Then check if the copy speed is improved.

Best Regards,
Candy


If the Answer is helpful, please click "Accept Answer" and upvote it.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.



5 |1600 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

BSR-3224 avatar image
0 Votes"
BSR-3224 answered

@CandyLuo-MSFT Thanks, we checked and it was enabled and we disabled it as you said but unfortunately copy speed didn't improve!
I think speed decrease make sense because copy beginning happens in memory cache then through storage write bottleneck, speed decrease. But why sometimes it drops to zero i wonder.

5 |1600 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

CandyLuo-MSFT avatar image
0 Votes"
CandyLuo-MSFT answered

Hi @BSR-3224,

For slow copy performance, we need to trace netmon and procmon to find the cause. However, analysis of log is beyond our forum support level and due to forum security policy, we have no such channel to collect user log information. So, we recommend you open a case with MS Professional tech support service, they will help you open a phone or email case to Microsoft, so that you would get a technical support on a one-to-one basis while ensuring private information.

Here is the link:

https://support.microsoft.com/en-us/gp/customer-service-phone-numbers

Best Regards,
Candy


If the Answer is helpful, please click "Accept Answer" and upvote it.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

5 |1600 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.