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Hi,
We have two US-based redirectors for CMS, located at xrootd.unl.edu and cmsxrootd1.fnal.gov. (We also have a DNS round robin for cmsxrootd.fnal.gov for those). They report to a global redirector at cms-xrd-global.cern.ch.
I expected to get tried= for both xrootd.unl.edu and cmsxrootd1.fnal.gov; instead I only get one, leading to redirection loops.
Here's the example, testing xrootd fallback from my local site (which has cmssrv203.fnal.gov and cmssrv224.fnal.gov)
[burt@cmslpc41 ~]$ xrdcp -d 1 -f "root://cms-xrd-global.cern.ch//store/relval/CMSSW_7_1_0/RelValMinBiasVHS/GEN-SIM/START71_V8_dvmc-v1/00000/04FBB641-13FB-E311-8580-0025905AA9CC.root?tried=+1213cmssrv203.fnal.gov,+1213cmssrv224.fnal.gov" /dev/null
140630 11:02:29 28768 Xrd: main: (C) 2004-2011 by the XRootD collaboration. Version: v3.3.6
140630 11:02:29 28768 Xrd: Create: (C) 2004-2010 by the Xrootd group. XrdClient $Revision$ - Xrootd version: v3.3.6
140630 11:02:30 28768 Xrd: ShowUrls: The converted URLs count is 2
140630 11:02:30 28768 Xrd: ShowUrls: URL n.1: root://xrdfed10.cern.ch:1094//store/relval/CMSSW_7_1_0/RelValMinBiasVHS/GEN-SIM/START71_V8_dvmc-v1/00000/04FBB641-13FB-E311-8580-0025905AA9CC.root?tried=+1213cmssrv203.fnal.gov,+1213cmssrv224.fnal.gov.
140630 11:02:30 28768 Xrd: ShowUrls: URL n.2: root://xrdfed09.cern.ch:1094//store/relval/CMSSW_7_1_0/RelValMinBiasVHS/GEN-SIM/START71_V8_dvmc-v1/00000/04FBB641-13FB-E311-8580-0025905AA9CC.root?tried=+1213cmssrv203.fnal.gov,+1213cmssrv224.fnal.gov.
140630 11:02:30 28768 Xrd: ShowUrls: The converted URLs count is 2
140630 11:02:30 28768 Xrd: ShowUrls: URL n.1: root://xrdfed09.cern.ch:1094//store/relval/CMSSW_7_1_0/RelValMinBiasVHS/GEN-SIM/START71_V8_dvmc-v1/00000/04FBB641-13FB-E311-8580-0025905AA9CC.root?tried=+1213cmssrv203.fnal.gov,+1213cmssrv224.fnal.gov.
140630 11:02:30 28768 Xrd: ShowUrls: URL n.2: root://xrdfed10.cern.ch:1094//store/relval/CMSSW_7_1_0/RelValMinBiasVHS/GEN-SIM/START71_V8_dvmc-v1/00000/04FBB641-13FB-E311-8580-0025905AA9CC.root?tried=+1213cmssrv203.fnal.gov,+1213cmssrv224.fnal.gov.
140630 11:02:30 28768 Xrd: Open: Access to server granted.
140630 11:02:30 28768 Xrd: Open: Opening the remote file /store/relval/CMSSW_7_1_0/RelValMinBiasVHS/GEN-SIM/START71_V8_dvmc-v1/00000/04FBB641-13FB-E311-8580-0025905AA9CC.root?tried=+1213cmssrv203.fnal.gov,+1213cmssrv224.fnal.gov
140630 11:02:30 28768 Xrd: Open: File open in progress.
140630 11:02:30 28771 Xrd: HandleServerError: Received redirection to [cmsxrootd1.fnal.gov:1094]. Token=[]]. Opaque=[].
140630 11:02:30 28771 Xrd: CheckErrorStatus: Server [cmsxrootd1.fnal.gov:1094] requested 1 seconds of wait
140630 11:02:31 28771 Xrd: CheckErrorStatus: Server [cmsxrootd1.fnal.gov:1094] requested 1 seconds of wait
140630 11:02:32 28771 Xrd: HandleServerError: Received redirection to [cms-xrd-global.cern.ch:1094]. Token=[]]. Opaque=[tried=+1213cmsxrootd1.fnal.gov].
140630 11:02:32 28771 Xrd: CheckErrorStatus: Server [cms-xrd-global.cern.ch:1094] requested 4 seconds of wait. Server message is session still active
140630 11:02:37 28770 Xrd: XrdClientMessage::ReadRaw: Failed to read header (8 bytes).
140630 11:02:37 28771 Xrd: HandleServerError: Received redirection to [xrootd.unl.edu:1094]. Token=[]]. Opaque=[].
140630 11:02:37 28771 Xrd: HandleServerError: Received redirection to [cmsxrootd1.fnal.gov:1094]. Token=[]]. Opaque=[].
140630 11:02:37 28771 Xrd: CheckErrorStatus: Server [cmsxrootd1.fnal.gov:1094] requested 1 seconds of wait
140630 11:02:38 28771 Xrd: HandleServerError: Received redirection to [cms-xrd-global.cern.ch:1094]. Token=[]]. Opaque=[tried=+1213cmsxrootd1.fnal.gov].
140630 11:02:38 28771 Xrd: HandleServerError: Received redirection to [xrootd.unl.edu:1094]. Token=[]]. Opaque=[].
140630 11:02:38 28771 Xrd: HandleServerError: Received redirection to [cmsxrootd1.fnal.gov:1094]. Token=[]]. Opaque=[].
140630 11:02:38 28771 Xrd: HandleServerError: Received redirection to [cms-xrd-global.cern.ch:1094]. Token=[]]. Opaque=[tried=+1213cmsxrootd1.fnal.gov].
140630 11:02:38 28771 Xrd: HandleServerError: Received redirection to [xrootd.unl.edu:1094]. Token=[]]. Opaque=[].
140630 11:02:38 28771 Xrd: HandleServerError: Received redirection to [cmsxrootd1.fnal.gov:1094]. Token=[]]. Opaque=[].
140630 11:02:38 28771 Xrd: CheckErrorStatus: Server [cmsxrootd1.fnal.gov:1094] requested 1 seconds of wait
140630 11:02:39 28771 Xrd: CheckErrorStatus: Server [cmsxrootd1.fnal.gov:1094] requested 1 seconds of wait
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