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Ollivier Robert
Works at EUROCONTROL
Attended Université Paris VII
Lives in Meudon
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Ollivier Robert

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[Blog][EN] 1st day of #BSDCan in Ottawa: Goat-BOF, devsummit and hacking lounge!

http://blog.keltia.net/2015/06/10/first-day-at-bsdcan-2015-devsummit/
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Ollivier Robert

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[Blog][FR] Les métadonnées ou comment j’arrêté de m’en faire et commencé à aimer le ‪#‎DPI‬ — (mes excuses à Stanley Kubrick) ‪#‎PJLRenseignement‬

http://blog.keltia.net/2015/05/08/metadonnees/
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Une version anglaise peut être intéressante 0:)
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Michel a partagé mon dernier billet de blog :)
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À Messieurs Valls, Cazeneuve et Hollande, ainsi qu'à leurs prédécesseurs… Bonjour, vous n'avez pas honte ? Vos prédécesseurs nous ont servi les lois …
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[Blog] [EN] 1st day at ‪#‎FreeBSD‬ ‪#‎devsummit‬ at ‪#‎EuroBSDCon‬ 2014 in Sofia, Bulgaria — http://blog.keltia.net/2014/09/25/first-day-in-sofia/
So today was the first day of the EuroBSDCOn 2014 conference, traditionally starting by two days of FreeBSD devsummit, a meeting of FreeBSD …
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Ollivier Robert

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Please submit papers & talks for upcoming #EuroBSDCon! Lots of tech talks, fun and socialization. This year Sep. 25-28th in Sofia, Bulgaria.
See CFP there http://2014.eurobsdcon.org/calendar/call-for-papers/

Soumettez svp des propositions pour des ateliers/présentations à la future conférence #EuroBSDCon 2014 à Sofia en Bulgarie. Plein de papiers techniques, du fun et des réseaux sociaux IRL! Le CFP est à l'adresse au dessus! Rendez vous à Sofia !
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EuroBSDcon 2014: September 25-28 in Sofia, Bulgaria. EuroBSDcon is the European technical conference for users and developers of BSD-based systems. The conference will take place September 25 to 28 at InterExpo Congress Center in Sofia (see http://iec.bg/en/). Tutorials will be held on Thursday ...
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Ollivier Robert

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Eagle from the steppes, taken in Dourdan at the Medieval Fair.
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Bella
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Ollivier Robert

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"Quelques" photos prises à l'exposition/salon #Geekopolis à la porte de Versailles hier. Superbes costumes, gens sympas et plein de très jolis visages. Content (et mal aux pieds) :)

Fujifilm X-T1 + XF23mm ou XF56mm
http://assets.keltia.net/photos/Geekopolis-2015/
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Blog : Bref, j'ai essayé une Tesla. [FR]

http://blog.keltia.net/2015/04/30/bref-j-ai-essaye-une-tesla/
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Premières photos avec le Fujifilm X-T1 et le sublime 56mm/f1.2
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First shots with that awesome Fujifilm X-T1 and its 56mm/f1.2.
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Wow, je ne savais pas, merci :)
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BSDCan 2014 is finished -- here are my set of pictures taken during the devsummit and the conference (including an early BoF called the Goat BoF at the Royal Oak) :)

http://assets.keltia.net/photos/BSDCan-2014/

Enjoy!
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I should have guessed you were the photograph behind that magnificent photo of Bob.

The wildlife of OpenBSD developers at its best !
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Finally got some time and finished editing all the pictures. Here they are, pictures from EuroBSDCon 2013 in Malta! Pentax K-5 & iPhone 5 mixed.

J'ai enfin réussi à trouver un peu de temps, voici les photos de EuroBSDCon 2013 à Malta, mix de photos prises au Pentax K-5 et iPhone 5.
#FreeBSD #BSD #EuroBSDCon #Malta

http://assets.keltia.net/photos/EuroBSDCon-2013/
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Interesting!
 
How fast are the 3TB disks when loading a database from a text file?  How much overhead does raid impose? This test will invoke many different types of IO and takes about 20-25 minutes.  The workload varies and alternates between disk intensive and CPU intensive.

The drives tested are:

* Segate ST3000DM001-1CH1
* Western Digital WD30EFRX-68A 0A80 (also touted as WD Red NAS)
* Toshiba DT01ACA3 ABB0

Out of interest, I also had some 2TB Seagate ST2000DM001-1CH1 for testing.  It turns out that the 2TB Seagate is faster than the 3TB model.

The objective of the tests was to find out which of these three drives was fastest for various tasks, then purchase several of those drives for use within a single server.  Ultimately, this will be a server running FreeBSD 9.1 with 8-10 HDD ZFS running as raidz2.

Ideally, I could purchase 8 of each type of HDD and test them under ZFS. On my personal budget, that's not feasible.  Instead, I am buying one disk of each type and testing them individually. This is under the assumption that if one clearly outperforms the other, a group of those same disks would also outperform the others.

I plan to do more tests, but for now, there is a clear winner for a single ZFS HDD.  The Toshiba DT01ACA3.  The time to load up the database nearly 8% faster than the WD30EFRX, and 24% faster than the ST3000DM001.  But only 13% faster than the Segate 2TB model.

It is interesting to note that the Seagate was faster than the WD on UFS.  But the Toshiba won on both ZFS and UFS.

I also did a test of 4x2TB Segate ST2000DM001-1CH1 in a raidz2.  That turns out to be 16% faster than a single HDD.  All of these tests are done without any ZFS tuning whatsoever.

I compared raidz2 with non-raidz.  Conclusion: raidz2 imposes a 2.3% performance hit.

I compared raidz1 with non-raidz.  Conclusion: raidz1 imposes a 1% performance hit.

Now my decision is: do I want the faster Toshiba drive with a one year warranty?  Or the slightly slower Western Digital drive, with a three year warranty?

For the record, the average time for this test, taken over 

I have an ugly spreadsheet with the results at the link below.
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Work
Occupation
System Engineer
Skills
UNIX, TCP/IP, Security, FreeBSD, MacOS X, Linux
Employment
  • EUROCONTROL
    Engineer, 1996 - present
  • Hervé Schauer Consultants
    1994 - 1996
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Meudon
Previously
Vanves
Story
Tagline
UNIX & crypto geek, photographer, Apple fan, cat-lover and many other things...
Bragging rights
group.as
Education
  • Université Paris VII
    Informatique, 1988 - 1991
  • IUT Orsay
    Informatique, 1986 - 1988
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Male