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Slow SMB speeds after a few hours of uptime Server 2012

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#1 d-shade


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Posted 31 January 2017 - 10:39 PM

I have a windows storage server 2012 box connected with a 10gb connection. After a restart transfer speed is great(700+ MB/s) but after a few hours the transfer speeds are horrible(300~ KB/s).

This is a low use server so I didn't even know this was going on until recently. Looking at the network performance there is nothing using the network during the slow transfers.

This seems to be affecting only smb transfers as internet traffic seems fine as far as I can tell.


We have a glogic(formerly broadcom) Netextreme II card 2x 10gb 2x 1gb built in. I was initially using a single 10gb connection using a media converter. I removed the media converter thinking that was some how messed up, And for a while was using all four nics in a LACP configuration but the problem persisted.


I installed a fiber network card from sonnet tech thinking maybe the network card was messed up but the problem is still persisting.


I am wondering if anyone has run into something like this. Or know of a solution to maybe fix it?

I am not virtualizing anything on the server and SMB packet signing is turned off.

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#2 JohnnyJammer


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Posted 31 January 2017 - 11:25 PM

I can vaguely remember reading an article with Win2012 that some clients (XP and Win7) may still be using SMBv1, you have to do a registry edit and reboot server to force clients to use SMBv2 or 3 from memory.

 An article here mate


#3 d-shade

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Posted 01 February 2017 - 12:16 AM

Thanks, I will take a look at that tomorrow and try the commands on the server but I am not sure if this is what is affecting me.

The transfers I am doing to test the transfer speed is from the server to our isilon storage cluster.


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