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Hi, traffic is simply from CMS jobs, we don't think this trafficis weird. What looks weird is threads hanging. Is there a way we could monitor hanging threads? Such threads do not make traffic.

As already said, we are running 4 XrootD servers dedicated to CMS, running XrootD 4.12.4-1.el7, only used for XrootD and equipped with 2x100Gbps Ethernet which are remote mounting shared (GPFS) filesystem (they are not used as GPFS NSD servers).
Our configuration file is attached to the original message from Andrea, please see above
(xrd.sched mint 16 maxt 4096 avlt 8 idle 60s
following your suggestion)

Thanks for your help,
lucia

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