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Support use of xrootd by HEP experiments

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Subject:
From:
Marian Zvada <[log in to unmask]>
Reply To:
Support use of xrootd by HEP experiments <[log in to unmask]>
Date:
Fri, 25 Sep 2015 11:33:09 -0500
Content-Type:
text/plain
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text/plain (70 lines)
Thanks Andy, that nicely explains. We can live with that for now as we 
know it doesn't harm anything and understand this message as no real 
error. Using DNS alias is more and more popular in the federation 
setups, so if you can develop solution that preserve different cluster 
ID appearance it'll be well received by everyone I think.

Thanks,
Marian

On 9/24/15 10:01 AM, Andrew Hanushevsky wrote:
> Hi Marian,
>
> OK, I found the source of the problem. It's related to the fact that the
> CERN DNS permutes the ist of IP addresses associated with
> cms-xrd-global.cern.ch (it's load balanced). I thought I had taken care
> of this problem but it appears that the code can be bypassed. This
> causes a different cluster ID developed by each of the managers and the
> meta-manager detects that and complains. I'll develop a new fix.
> Generally, this creates more traffic on the network but otherwise should
> not cause a problem in the way the redirector is being used. You could
> get arround the problem by listing xrdcmsglobal01 and xrdcmsglobal02 as
> separate entries (i.e. not use the global name). But it's probably not
> necessary at this point.
>
> Andy
>
> On Tue, 22 Sep 2015, Marian Zvada wrote:
>
>> I forgot to say EU redirector restarted subscribes to the global ones
>> mentioned in the log snipped...
>>
>> -Marian
>>
>> On 9/22/15 12:03 PM, Marian Zvada wrote:
>>> Hi,
>>>
>>> Tom found this in his log files of redirector when restarting the
>>> service:
>>>
>>>  > 150922 09:59:44 31930 Manager: xrdcmsglobal02.cern.ch manager
>>> configuration
>>>  > differs from xrdcmsglobal01.cern.ch for site local; making file
>>> location
>>>  > unpredictable!
>>>
>>> What this might indicate? We've crosschecked config files on both global
>>> redirectors and they are coherent!
>>>
>>> Thanks,
>>> Marian
>>>
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