Naechster Vortrag am Mittwoch, 2. April 2003

Hallo liebe Mongers,

unser nächstes Treffen findet am

        Mittwoch, 02. April 2003, 19:00 Uhr im
        Schachner Hof, Pognerstr. 5, 81379 München

mit Vortrag statt.  Wilfried Gänsheimer wird uns etwas über sein
"OpenDist" Projekt erzählen:

     Perl at work:  OpenDist - Incremental Software Distribution /
                               Synchronisation 

     Welche Tools gibt es zur Synchronisation grosser Fileserver und
     warum habe ich was eigenes geschrieben. Noch dazu mit Perl. Ein
     Überblick.


Ich bitte um zahlreiches Erscheinen   :-))   

Um einen gewissen Überblick zu haben, wäre es günstig zu wissen, wer
von Euch alles zu diesem Treffen kommen wird.

Und bitte, Thoren, trag den Termin und das Vortragsthema auf unseren
Web-Seiten ein, danke.

Gruß,

Norbert
-- 
Ceterum censeo          | PGP encrypted mail preferred.
Redmond esse delendam.  | PGP Key at www.MPA-Garching.MPG.de/~nog/

Perl at work:  OpenDist - Incremental Software Distribution / Synchronisation

  Welche Tools gibt es zur Synchronisation grosser Fileserver und
  warum habe ich was eigenes geschrieben. Noch dazu mit Perl. Ein
  Überblick.

OpenDist is a new set of tools for Software Distribution. It is
designed to work for many, huge Software packages that are updated
daily.  Wilfried Gänsheimer and Peter Osel have published a paper on
OpenDist <ftp://ftp.pwo.de/pub/pwo/OpenDist/OpenDist.lisa95.ps> on the
Usenix <http://www.usenix.org> conference LISA IX (Large Installation
System Administration Conference 1995).  (das war 1995 geschrieben)

Details:
- Grundsätzliche Problemstellung der globalen Softwareverteilung
  Benchmark, Requirements, Evaluation of available Tools
  Grundlagen: Updateflow

- Vergleich mit anderen Tools (rdist, rsync, depot, Tivoli, Xfer,....), 
  Vor- und Nachteile

- Praktische Hinweise
  Add on's: Benchmark, Backup, Monitoring

- Links:
  www.osel.de -> Projects -> OpenDist
  www.usenix.org -> Proceedings of Lisa IX 1995

-  Abstract:
   OpenDist provides efficient procedures and tools to synchronize our
   software file servers. This simple goal becomes challenging because
   of the size and complexity of supported software, the diversity of
   platforms, and because of network constraints.  Our current
   solution is based on rdist (1) [1]. However, it is not possible
   anymore to synchronize file servers nightly, because it takes
   several days just to compare distant servers.  We have analyzed the
   update process to find bottlenecks in the current solution. We
   measured the effects of network bandwidth and latency on rdist. We
   created statistics on the number of files and file sizes within all
   software packages.  We found that not only the line speed, but also
   the line delay contributes substantially to the overall update
   time. Our measurements revealed that adding a compression mode to
   rdist would not have solved our problem, so we decided to look for
   a new solution.  We have compiled a list of requirements for
   evaluating software distribution solutions.  Based on these
   requirements, we evaluated both commercial and freely available
   tools. None of the tools fulfilled our most important requirements,
   so we implemented our own solution.  In the following we will
   describe the overall architecture of the toolset and present
   performance figures for the distribution engine that replaces
   rdist. The results of the prototype implementation are
   promising. We conclude with a description of the next steps for
   enhancing the OpenDist toolset.

Dauer: ca. 1 Stunde