Windows Offline Files - Is it possible to reduce the Slow Link Detection time interval?

Hi,

Windows Offline files seems to detect a Slow Link transition pretty quickly and changes to offline mode, but it seems rather slow detecting when the Slow Link transitions back to a Fast Link - is there any way to reduce the Slow/Fast Link Detection checking interval as I can't find a Registry Key that controls this?

ie, if you pull the network, the machine pretty quickly switches to offline mode, but when you re-insert the network it seems to take 2 minutes to detect the re-connection before it switches to online mode.

I would very much like to reduce this 2 minute interval to something more like 15 to 30 seconds - can this be done?

Thanks and Regards

Gary



  • Edited by Gary Mansell Thursday, February 05, 2015 8:27 AM
February 5th, 2015 11:24am

Hi Gary,

Please check if your network latency is larger than 80 milliseconds.
If you have so large latency, it is not recommended to disable the slow link.
Because many other important program need the network resource.

As I dont have the large latency environment to test, please check if the issue still exists when you disable the group policy.
Computer Configuration\Administrative Templates\Network\Offline Files\Configure slow-link mode

Best regards,
Fangzhou CHEN

Free Windows Admin Tool Kit Click here and download it now
February 16th, 2015 2:23am

No - this is not the case, I have set the slow link switching latency to 10ms on my machines.

This way, when the laptops are on the LAN (latency 0.1ms) they are seen as on a fast link, but when they are on the VPN (latency 30+ ms) they will be seen on slow link and will use local cached files.

This works fine apart from the time it takes to detect reconnecting to the LAN - when a user plugs in a LAN cable, it takes 2 minutes before the Fast Link is detected and hence the user can see all the files on the network share rather than just those he has cached.

Surely there must be some setting to reduce this checking interval?

Rgds

Gary

February 16th, 2015 3:33am

Hello Gary,

I think when PC change to use LAN, it need time to negotiate with Switch port and use time to contact the DHCP server to get the IP information.
Please check the time between you get the IP address information and see all files.

Because based on my test in virtual machines, I disable the network card driver and then add a new test file in the offline folder. Just after my enabling the network driver, the file is sync to the source share folder immediately.

I think it takes 2 minutes is not caused by the configuration in Windows.

Best regards,
Fangzhou CHEN

Free Windows Admin Tool Kit Click here and download it now
February 18th, 2015 8:57pm

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