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

Jan-Erik Soderholm jan-erik.soderholm at telia.com
Tue Feb 18 16:02:58 EST 2014


David Froble wrote 2014-02-18 19:38:
> 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?
>

Agree, but start with the obviouse, not with just about anything.

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

I'd bet that the other/old location used managed switches with
auto-negotiation disabled.


> The OP is withholding important data ....

Probably not with will, but yes... :-)





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