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Comprehensive Overview of SLAC Computer Services and Supported Systems by Chuck Boeheim

Chuck Boeheim, Assistant Director of SLAC Computer Services, presents a detailed report on the supported computing systems in use, including AIX 4, Solaris 2.6, and Linux RH 6.0. Highlights include the status of AFS 3.5 stability on various platforms, the deployment of HPSS for tape management in BaBar, and challenges surrounding system image management with Autoclient. The report emphasizes the performance improvements seen with AFS 3.5 and addresses manpower concerns and staging needs for an effective operation.

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Comprehensive Overview of SLAC Computer Services and Supported Systems by Chuck Boeheim

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Presentation Transcript

  1. SLAC Site Report Chuck Boeheim Assistant Director SLAC Computer Services

  2. Supported Systems • AIX 4 – <114 • No new AIX systems being purchased • Candidate for future phase out • Solaris 2.6 -- 748 • Current recommended desktop system • Solaris 7 needs AFS client; schedule deployment around BaBar run schedule • Linux RH 6.0 -- >130 • Using Transarc AFS 3.5 Chuck Boeheim/SCS

  3. AFS • Entirely at AFS 3.5 • AFS 3.5 server on Solaris 2.6 • AFS 3.5 client on Solaris, AIX, Linux, NT • Servers now largely stable • Had long period of intensive work with Transarc • Clients stable except E1000 • Performance • Generally improved by 3.5 • Severe congestion on SMP servers Chuck Boeheim/SCS

  4. AFS Utilization Curve Chuck Boeheim/SCS

  5. BaBar Computing Chuck Boeheim/SCS

  6. HPSS/OOFS • HPSS has been deployed as a tape management system for BaBar • HPSS does NOT manage disk pools • OOFS developed to migrate/retrieve objectivity databases using HPSS • Issue about manpower needed to operate • Issue what to do about general staging needs Chuck Boeheim/SCS

  7. Adventures With Autoclient • How to cheaply manage 320 system images? • Autoclient from Sun: • System boots via net from server • / mounted r/o from server • /etc mounted r/w from server • /usr/vice/cache, /tmp, swap local • Ratio of one server per 50 clients Chuck Boeheim/SCS

  8. Autoclient Results • Systems did install on boot • Quick recoveries after outage • Uncertain if this makes upgrades easier • Single point of failure for 50 systems • Some odd behavior with cachefs • Evaluating approach now, working with Sun Product Manager Chuck Boeheim/SCS

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