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NewsGroups
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      09-14-2009, 02:53 AM
If I have flow control at the ethernet card, do I need it at the switch?
doesnt TCP provide flowcontrol at the transport layer? We have a network
timeout issue when copying very large files batches of files at 8-10 GB,
and one thought was to add layers of flow control

--
Craig


 
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Mel K.
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      09-14-2009, 09:18 PM
Flow control is inherent within the TCP/IP stack itself. You should leave
your NIC settings at the defaults until you can pinpoint the issue. I
believe that the flow control setting on the NIC needs to work with the same
settings on the switch also, so leave that setting alone unless you are sure
it will help.

Are you using 1 Gb/s NICs and switches from end to end? If so, did you
hardcode the duplex and speed anywhere along the path? If you did, undo it.
1 Gb/s does not need any hardcoding, and doing so can actually cause
problems. I ran into issues with my EMC Celerra when I used a switch that
was hardcoded.

--

Mel K.
MCSA: M, Ex2000
MCTS: Ex2007
"NewsGroups" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> If I have flow control at the ethernet card, do I need it at the switch?
> doesnt TCP provide flowcontrol at the transport layer? We have a network
> timeout issue when copying very large files batches of files at 8-10 GB,
> and one thought was to add layers of flow control
>
> --
> Craig
>



 
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