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Efficient Redirection Topology for Hardware at CERN

Learn about the redundant redirectors for various regions, xrootd and cmsd redirection, and the verification process for the topology at CERN. Discover how the system works and how to diagnose any broken nodes efficiently.

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Efficient Redirection Topology for Hardware at CERN

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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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