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Chris Brew CCLRC - RAL

HEPiX Workshop Summery Brookhaven National Laboratory October 18-22 2004 http://www.rhic.bnl.gov/hepix/agenda.shtml. Chris Brew CCLRC - RAL. Highlights. Spread of Scientific Linux Opterons have better price/performance ratio than Xeon XFS on Performance Disk servers

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Chris Brew CCLRC - RAL

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  1. HEPiX Workshop SummeryBrookhaven National Laboratory October 18-22 2004http://www.rhic.bnl.gov/hepix/agenda.shtml Chris Brew CCLRC - RAL

  2. Highlights • Spread of Scientific Linux • Opterons have better price/performance ratio than Xeon • XFS on Performance Disk servers • Spam is a major problem for a lot of labs • CHOS for maintaining old Linux Versions • Ranger as a better SWATCH • AFS • Computer (In)Security

  3. Spread of Scientific Linux • Only 5 months on from the “Edinburgh Accord” Scientific Linux is spreading throughout HEP • Mentioned in at least 9 large site reports including CERN, DESY and SLAC • Next release of LCG will be primarily on SL so even more sites will soon be running it • Only concern for future is compatibility between CERN and Core version

  4. Opteron/Nocona Comparison • http://www.rhic.bnl.gov/hepix/talks/041021am/wiesand.pdf • DESY and BNL independently ran performance tests of next generation of 64bit i386 chips from AMD and Intel • Issue of porting HEP software to 64 bit and supporting what is effectively an extra OS • Overall 64bit

  5. XFS on Performance Disk Servers • There we a number of talks on disk server performance • http://www.rhic.bnl.gov/hepix/talks/041021am/iven.ppt • http://www.rhic.bnl.gov/hepix/talks/041019pm/vaneldik.ppt • http://www.rhic.bnl.gov/hepix/talks/041019pm/schoen.pdf • All either just used XFS and the file system (presumably from previous tests) or where it was tested it came out significantly better

  6. SPAM! • Large sites are expending a great deal of effort to try to reduce the amount of spam received by their users • One site (JLab) has gone as far as contracting an external company MXLogic to filter all mail offsite to block spam • CERN having reached the limits of content filtering has now started implementing active low level blocks: • Reverse DNS Lookup (increase detection 55% to 85%) • Reverse SMTP connect (should remove 25% more)

  7. CHOS – Change OShttp://www.rhic.bnl.gov/hepix/talks/041020am/canon.ppt • CHOS was written at NERSC to aid in securely supporting multiple Linux versions on one machine • Allows divorcing the system OS from the user OS • Basically chroot’ing to a different OS but it’s integrated with the batch system and pam so it’s transparent to the users

  8. Ranger as a better swatchhttp://www.rhic.bnl.gov/hepix/talks/041018pm/boeheim.ppt • Latest enhancements of the SLAC ranger package implements an extended swatch like functionality • Talk slides give examples of uses and rulesets

  9. AFS • AFS still going strong • Many sites at various stages on the TansArc AFS → OpenAFS → OpenAFS+Kerberos 5 path • SLAC has PERL modules for doing AFS admin http://www.rhic.bnl.gov/hepix/talks/041020am/wachsmann.pdf

  10. Computer (In)Security • Bob Cowles (SLAC) gave his customary talk to terrify the rest of the admins • Long lists of vulnerabilities in Windows, Linux and MacOSX • Good examples of Phishing scams

  11. Phishing 1

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