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Ok , I came back and was able to do some more tests: - DNS seems fine: -bash-3.2$ dig xrootd-cms.infn.it ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 <<>> xrootd-cms.infn.it ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34947 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 4, ADDITIONAL: 6 ;; QUESTION SECTION: ;xrootd-cms.infn.it. IN A ;; ANSWER SECTION: xrootd-cms.infn.it. 69424 IN A 90.147.66.75 xrootd-cms.infn.it. 69424 IN A 193.205.76.83 so they are the same records as yours. - I can still consistently get a failure with: xrdcp -d 1 root://xrootd-cms.infn.it///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root . 140423 16:13:49 001 Xrd: ShowUrls: The converted URLs count is 2 140423 16:13:49 001 Xrd: ShowUrls: URL n.1: root://xrootd-redic.pi.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root. 140423 16:13:49 001 Xrd: ShowUrls: URL n.2: root://xrootd.ba.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root. 140423 16:13:49 001 Xrd: ShowUrls: The converted URLs count is 2 140423 16:13:49 001 Xrd: ShowUrls: URL n.1: root://xrootd-redic.pi.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root. 140423 16:13:49 001 Xrd: ShowUrls: URL n.2: root://xrootd.ba.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root. 140423 16:13:49 001 Xrd: Connect: can't open connection to [xrootd-redic.pi.infn.it:1094] 140423 16:13:49 001 Xrd: XrdNetFile: Error creating logical connection to xrootd-redic.pi.infn.it:1094 140423 16:13:49 001 Xrd: Open: Connection attempt failed. Sleeping 5 seconds. 140423 16:13:54 001 Xrd: ShowUrls: The converted URLs count is 2 140423 16:13:54 001 Xrd: ShowUrls: URL n.1: root://xrootd-redic.pi.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root. 140423 16:13:54 001 Xrd: ShowUrls: URL n.2: root://xrootd.ba.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root. 140423 16:13:54 001 Xrd: Connect: can't open connection to [xrootd-redic.pi.infn.it:1094] 140423 16:13:54 001 Xrd: XrdNetFile: Error creating logical connection to xrootd-redic.pi.infn.it:1094 140423 16:13:54 001 Xrd: Open: Connection attempt failed. Sleeping 5 seconds. 140423 16:13:59 001 Xrd: ShowUrls: The converted URLs count is 2 140423 16:13:59 001 Xrd: ShowUrls: URL n.1: root://xrootd-redic.pi.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root. 140423 16:13:59 001 Xrd: ShowUrls: URL n.2: root://xrootd.ba.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root. But: these machines, as well as CERN ones (at the very least), do use NSCD (so they cache the DNS answers). Could this be the problem? I was guessing it would not, since my understanding was that even Xrootd randomizes the entries got from DNS Can this be the problem? If yes, it would be tricky: we basically cannot ask sites to disable NSCD, sicne it is used to decrease load PS: maybe you can try directly xrdcp -d 1 root://xrootd-cms.infn.it///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root . it should work for anyone up to the point where you are redirected (redirectors are w/o authentication, servers are .) to see if it works for you ciao ciao tom On 19 Apr 2014, at 05:02, Andrew Hanushevsky <[log in to unmask]> wrote: > Hi Tommaso, > > OK, I created a setup similar to yours. Specifically, in the DNS I have: > > abh-rdr.slac.stanford.edu. 600 IN A 134.79.120.146 // noric35 > abh-rdr.slac.stanford.edu. 600 IN A 134.79.120.152 // noric40 > > I started a redirector on noric35 and left noric40 with nothing. I then did an xrdcp (using the old client) and it worked as expected (see the trace below). Some things to consider: > > 1) Was your DNS setup up as mine was (i.e. using A records)? > 2) What was the release you were using? I used what is now R4 and 3.2.6 (a much older release) with identical results. The recoery code was not changed in the 3.2.x or the 3.3.x series. So, no suprise. > > My only assumption is that the DNS record was not setup in a way that the client expected (though, the trace seems to counter that notion). So, at the moment I am at a loss. Anyway, to cut down the only tracing chatter so as to make the output more readable, just use -d 1 which is good enough. > > Andy > > ./xrdcp -f -d 1 root://abh-rdr.slac.stanford.edu//tmp/motd /tmp/motd > 140418 19:38:24 28376 Xrd: main: (C) 2004-2011 by the XRootD collaboration. Version: v20140318-ef1e4ab > 140418 19:38:24 28376 Xrd: Create: (C) 2004-2010 by the Xrootd group. XrdClient $Revision$ - Xrootd version: v20140321-cdb721c > 140418 19:38:24 28376 Xrd: ShowUrls: The converted URLs count is 2 > 140418 19:38:24 28376 Xrd: ShowUrls: URL n.1: root://noric40.slac.stanford.edu:1094//tmp/motd. > 140418 19:38:24 28376 Xrd: ShowUrls: URL n.2: root://noric35.slac.stanford.edu:1094//tmp/motd. > 140418 19:38:24 28376 Xrd: ShowUrls: The converted URLs count is 2 > 140418 19:38:24 28376 Xrd: ShowUrls: URL n.1: root://noric35.slac.stanford.edu:1094//tmp/motd. > 140418 19:38:24 28376 Xrd: ShowUrls: URL n.2: root://noric40.slac.stanford.edu:1094//tmp/motd. > 140418 19:38:24 28376 Xrd: Connect: can't open connection to [noric40.slac.stanford.edu:1094] > 140418 19:38:24 28376 Xrd: XrdNetFile: Error creating logical connection to noric40.slac.stanford.edu:1094 > 140418 19:38:24 28376 Xrd: Open: Connection attempt failed. Sleeping 5 seconds. > 140418 19:38:29 28376 Xrd: ShowUrls: The converted URLs count is 2 > 140418 19:38:29 28376 Xrd: ShowUrls: URL n.1: root://noric40.slac.stanford.edu:1094//tmp/motd. > 140418 19:38:29 28376 Xrd: ShowUrls: URL n.2: root://noric35.slac.stanford.edu:1094//tmp/motd. > 140418 19:38:29 28376 Xrd: Open: Access to server granted. > 140418 19:38:29 28376 Xrd: Open: Opening the remote file /tmp/motd > 140418 19:38:29 28376 Xrd: Open: File open in progress. > 140418 19:38:29 28379 Xrd: HandleServerError: Received redirection to [rhel6-64b.slac.stanford.edu:1094]. Token=[]]. Opaque=[]. > 140418 19:38:29 28376 Xrd: main: root://abh-rdr.slac.stanford.edu//tmp/motd --> /tmp/motd > 140418 19:38:29 28381 Xrd: Read: Hole in the cache: offs=0, len=1536 > [xrootd] Total 0.00 MB |====================| 100.00 % [inf MB/s] > > ######################################################################## > Use REPLY-ALL to reply to list > > To unsubscribe from the XROOTD-L list, click the following link: > https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1