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Hi Bockjoo, Remind me what DFS you are using (gpfs, lustre, etc)? Does the redirector log (xrootd and cmsd) show anything unusual? As for hanging at that line, that isn't necessarily where it happens as hat is just a message and execution continues, though bviously without getting a responds for a long time. When you say "time to time" what is the periodicity? I presume the servers are running on bare metal (i.e. not VM's nor containers), yes? There can be any number of reasons why this is happening. Once you answer the above we can construct an appropriate trace on the redirector to narrow down where it is actually happening. Andy On Thu, 8 Dec 2022, Bockjoo Kim wrote: > Hi, > > I have an issue with my redirector (XRootD 5.5.0) with the command: > > /usr/bin/xrdfs cmsio7.rc.ufl.edu:1094 stat > //store/mc/SAM/GenericTTbar/AODSIM/CMSSW_9_2_6_91X_mcRun1_realistic_v2-v1/00000/A64CCCF2-5C76-E711-B359-0CC47A78A3F8.root > > Usually, the command returns in less than 5 seconds, but from time to time, > it hangs here: > > [2022-12-09 00:07:54.714793 +0100][Debug ][TaskMgr ] Registering > task: "StreamConnectorTask for cmsio7.rc.ufl.edu:1094" to be run at: > [2022-12-09 00:09:54 +0100] > > and eventually returns in more than 2 minutes. > > Other USCMS Tier2 sites do not have this issue. > > There are 7 servers under the redirector and they do not have this issue. > > I thought the cmsd directive, cms.dfs might have something to do with this, > so I tried a different option. > > But that didn't change anything. > > My current config uses this option for the cms.dfs directive: > > cms.dfs limit 0 lookup distrib mdhold 0 redirect immed retries 2 > > > What could be the source of the problem? > > Thanks, > > Bockjoo > > ######################################################################## > 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