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FAX Redirection Topology Wei Yang 7/16/121. Redirector hardware at CERN Redundant redirectors for EU, UK, DE, FR – Redundant (the “+” sign below) VMs.

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Presentation on theme: "FAX Redirection Topology Wei Yang 7/16/121. Redirector hardware at CERN Redundant redirectors for EU, UK, DE, FR – Redundant (the “+” sign below) VMs."— Presentation transcript:

1 FAX Redirection Topology Wei Yang 7/16/121

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 7/16/122

3 Redirector topology EU rdr DE rdr UK rdr US rdr Glasgow rdr Middle West rdr Site 1 rdr Site 2 rdr Site A rdr Site B rdr cmsd & xrootd redirection Mature xrootd redirection 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 7/16/123

4 # CMSD redirection: all.role manager all.manager leftregion:1234 # Upper level redirector all.manager meta xyzzy:1234 $ XROOTD redirection xrootd.redirect xyzzy:1234 ? / all.role manager all.manager rightregion:1234 all.manager meta xyzzy:1234 xrootd.redirect xyzzy:1234 ? / How the topology works Global Redirector “ xyzzy ” Regional Redirector Local RedirectorProxy ServerProxy ManagerLocal Redirector ServerProxy ServerServer all.role meta manager all.manager meta xyzzy:1234 all.role manager all.manager lefthand:1234 all.manager meta leftregion:1234 xrootd.redirect leftregion:1234 ? / all.role manager all.manager righthand:1234 all.manager meta rightregion:1234 xrootd.redirect rightregion:1234 ? / all.role server all.manager leftregion:1234 ofs.osslib psslib.so pss.origin mycluster:1094 all.role proxy manager all.manager meta leftregion:1234 xrootd.redirect xyzzy:1234 ? / Site DSite ASite BSite C 7/16/124Steal 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 7/16/125

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