[Info-vax] Sudden problems with slow sftp transfers and slow disk accesses

[David Froble]

Jan-Erik Soderholm wrote:
> David Froble wrote 2014-02-18 16:05:
>> gwilliams at cfa.harvard.edu wrote:
>>
>>> The switch is an auto-sensing Netgear 16-port FS116.  I don't see how
>>> I can check what the switch is set to.
>>>
>>
>> What changed?  Concentrate there ...
>>
>> Is this the same switch used in the old location ?
>>
>> If not, that might be the problem, either set the switch to match the
>> Alphas, or, set the Alphas to match the switch.
>>
>> I'm guessing there is a good chance that the cables are new.  If so, 
>> try a
>> replacement cable, replacing the in place cables one at a time and test.
>>
>> You got a network problem, don't blame the computers ....
> 
> Maybe you have not followed the thread, but this issue is probably
> solved by now. The switch was an unmanaged (sheap home) switch that 
> probably fall-backed into half-duplex...
> 
> A faulty cable giving "possible duplex mismatch"?
> I would first look for a duplex mismatch... :-)
> 
> Jan-Erik.

It's probably the duplex issue, I agree.  But, he moved 8 Alphas, and we 
don't know what has changed, and it could be lots of things.  Trust 
nothing.  Verify everything.  One thing at a time.  Who knows what might 
be found?

The key question is, "what changed?".  Did he use the same switch?  If 
so, why problems all of a sudden.

The OP is withholding important data ....