This looks like an IPv6 vs. IPv4 issue. Can you please post some info
about the network stacks involved?
Cheers,
Lukasz
On 07/21/2014 06:20 PM, Carl Lundstedt wrote:
> A request was made to me to send a synopsis of a problem we're having at
> Nebraska be sent to this list.
>
>
> We're having a strange issue at Nebraska involving our xrootd redirector
> + opportunistic clusters.
>
>
> Here's the problem:
>
> Worker nodes on our tusker cluster (with names like
> cxxxx.tusker.hcc.unl.edu) will make a redirection request to
> our xrootd.unl.edu redirector. These requests fail even though the
> requested file may exist in our Nebraska CMS tier-2 storage. If a
> direct xrdcopy request from a worker to one of our xrootd doors the
> transfer works fine.
>
> Broken attempt might look like:
>
> xrdcp
> root://xrootd.unl.edu//store/mc/Fall13dr/QCD_Pt-30to50_Tune4C_13TeV_pythia8/GEN-SIM-RAW/castor_tsg_PU20bx25_POSTLS162_V2-v1/010000/D870A076-657D-E311-9A82-0025905A60B8.root
> /tmp/tes/CMSSW_7_1_2/teln.root
> Last server error 3011 ('No reachable servers are available to read the
> file.')
>
> But look at this:
> xrdcp -x
> root://red-gridftp3.unl.edu//store/mc/Fall13dr/QCD_Pt-30to50_Tune4C_13TeV_pythia8/GEN-SIM-RAW/castor_tsg_PU20bx25_POSTLS162_V2-v1/010000/D870A076-657D-E311-9A82-0025905A60B8.root /tmp/tes/CMSSW_7_1_2/teln.root
> Extreme Copy enabled.
> Source #1
> root://129.93.239.173:1094//store/mc/Fall13dr/QCD_Pt-30to50_Tune4C_13TeV_pythia8/GEN-SIM-RAW/castor_tsg_PU20bx25_POSTLS162_V2-v1/010000/D870A076-657D-E311-9A82-0025905A60B8.root
> ^Crootd] Total 1269.37 MB |=>..................| 5.04 % [58.2 MB/s]
>
>
>
>
>
> Watching verbose copy attempts it appears that the redirection request
> also reaches out to fnal's xrootd redirector as well. These nodes are,
> naturally, behind a NAT but the doors and redirector can resolve the
> nodes directly.
>
>
> I'm stumped. This looks like a redirection problem triggered by our
> particular network topology. I'm all certain that things used to work.
>
>
> Carl Lundstedt
> UNL
>
>
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