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FAX Redirection Topology

FAX Redirection Topology. Wei Yang. Redirector hardware at CERN. Redundant redirectors for EU, UK, DE, FR Redundant (the “+” sign below ) VMs More to come atlas- xrd-eu.cern.ch + xrootd port 1094, cmsd port 1098 SLAC test machine can join it, working as expected

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FAX Redirection Topology

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  1. FAX Redirection Topology Wei Yang

  2. Redirector hardware at CERN • Redundant redirectors for EU, UK, DE, FR • Redundant (the “+” sign below) VMs • More to come • atlas-xrd-eu.cern.ch+ • xrootd port 1094, cmsd port 1098 • SLAC test machine can join it, working as expected • atlas-xrd-uk.cern.ch+ • Report to EU redirector • Xrootd port 1094, cmsd port ? • SLAC can’t join it, debugging … • Same for DE and FR redirectors

  3. Redirector topology cmsd & xrootd redirection EU rdr US rdr Mature xrootd redirection DE rdr UK rdr US rdr Glasgow rdr Middle West rdr Site 1 rdr Site 2 rdr Site A rdr Site B rdr • cmsd based redirection search the branch under it • xrootd based redirection is used to jump to upper level • if cmsd search return nothing • US can either report to EU redirector, or as a peer of EU • depend on needs, latency, or performance

  4. How the topology works # CMSD redirection: all.role manager all.manager leftregion:1234 # Upper level redirector all.manager meta xyzzy:1234 $ XROOTD redirection xrootd.redirect xyzzy:1234 ? / Global Redirector “xyzzy” all.role meta manager all.manager meta xyzzy:1234 all.role manager all.manager rightregion:1234 all.manager meta xyzzy:1234 xrootd.redirect xyzzy:1234 ? / Regional Redirector Regional Redirector Local Redirector Proxy Server Proxy Manager Local Redirector Site A Site B Site C Site D Proxy Server Server Server all.role manager all.manager lefthand:1234 all.manager meta leftregion:1234 xrootd.redirect leftregion:1234 ? / all.role server all.manager leftregion:1234 ofs.osslibpsslib.so pss.origin mycluster:1094 all.role proxy manager all.manager meta leftregion:1234 xrootd.redirect xyzzy:1234 ? / all.role manager all.manager righthand:1234 all.manager meta rightregion:1234 xrootd.redirect rightregion:1234 ? / Steal from Andrew Hanushevsky

  5. Topology verification Goal: diagnose broken node in the topology • Deploy site specific (small) file with known checksum • Access from global redirector • Test full redirection chain + N2N • For every lower level redirector • Test a file not exists in its domain How to find out that the actual topology is? • Who know how do this manually • We need to do it automatically and produce a graph

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