QuicksearchDisclaimerThe individual owning this blog works for Oracle in Germany. The opinions expressed here are his own, are not necessarily reviewed in advance by anyone but the individual author, and neither Oracle nor any other party necessarily agrees with them.
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Die dritte Wahl in der dritten WahlWednesday, June 30. 2010
Nun haben wir Herrn Wulff als Bundespräsidenten. Ob Schloss Bellevue jetzt in Castle Wulffenstein umbenannt wird, bleibt abzuwarten (Den verstehen wahrscheinlich nur wieder Geeks). Einige Gedanken dazu:
Herr Wulff, ich wünsche Ihnen alles Gute für Ihr Amt. Ich - und wahrscheinlich viele andere - erwarte aber von Ihnen viel mehr als blosses widerspruchsloses Ausfertigen von Gesetzen. An dem Mehr wird man sie am Ende Ihrer Amtszeit messen. Glücklicherweise kann ein Bundespräsident viel Gutes bewirken, aber aufgrund seiner Rolle im Staat wenig Schaden anrichten. PSARC 2009/042 max-processes resource controlTuesday, June 29. 2010
The code implementing "PSARC 2009/042 max-processes rctl" was integrated today at noon:
The max-processes resource controls introduced by this case limit the number of slots in the process table that a zone, project, or task may occupy.and While the existing max-lwps resource controls offer some protection, they cannot prevent zombie processes from filling up the process table. Zombie processes by definition do not have any lwps and are thus not limited by the max-lwps resource controls. Unterwäsche im HandgepäckThursday, June 24. 2010
Hmmm ... dieser Teil des Artikels "Schlafentzug im Schlafanzug" erinnert mich an eine grundlegende Regel des transkontinentalen Fliegens. Man sollte immer zumindestens eine Garnitur Unterwäsche im Handgepäck haben. Es ist möglicherweise die einzig frische Kleidung, die einem bleibt, wenn der Koffer den Umstieg nicht mitgemacht hat. Habe ich bitterböse im Rahmen meines zweiten Aufenthalts in San Francisco lernen dürfen ....
Und kann auch helfen, wenn man sich wie der Autor des Artikels bei Merian mit irgendwelchen Schickimicki-Unterhosen die Innenseiten der Schenkel runiert hat
Posted by Joerg Moellenkamp
in Business Travel, English, Travel
at
09:52
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Fighting for the best place in the apron busWednesday, June 23. 2010
A few weeks ago i wrote about this strange behaviour of airline passenger to storm the aircraft as there would be no reserved seats in it or no kind request to start boarding with the rows in the back of the aircraft.
There is another interesting behaviour: As i'm traveling to the smaller airports with smaller aircrafts quite frequently (Canadair, Embraer or Dash-8 ... not capable to use a gangway), apron-parking is something quite normal for me. You aren't allowed to walk over the apron, so they use busses to shuttle you to the aircraft. And here the strange behavior starts: No matter how many seats in the bus are still free, everyone tries to stand near the doors. Even when those spaces are overcrowded nobody starts to move into the aisles of the bus except the room is that overcrowded that people are forced to move into the aisle. I assume airline passengers would still fight to be first in the row or at near as possible to the exists of the bus when 10 passengers are booked for a A380 flight.
Posted by Joerg Moellenkamp
in Aviation, Business Travel, English
at
22:42
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A320Wednesday, June 23. 2010
A few days ago the A320 celebrated it's 50.000.000 take-off and the five billionth passenger since the introduction of this model in 1988. On the other side there were 9 hull losses with fatalities. So every 5.555.555 take offs there is one crash. If cars would have a crash for every 5 555 555 turns of the key, streets would be a much safer place.
Power CyclingSaturday, June 19. 2010
Do your really think, that power cycling your computer is just something people do at home, when their computer acts weird? Well ... not really. In a Safety Alert for Operators issued by the FAAyou will find the following two paragraph:
To alert all operators of MD-11 aircraft equipped with the Honeywell Pegasus FMC, with Future Air Navigation System (FANS) enabled, of possible erroneous Air Traffic Control (ATC) messages displayed in the CPDLC log.and On March 11, 2010, Boeing issued Multi Operator Message (MOM) SR1-1536638744. The MOM provides maintenance with procedures to clear the Honeywell FMC ATC Input Buffer by depowering the aircraft or resetting the appropriate circuit breakers before each FANS/CPDLC flight.There is an issue with the expiration of incoming messages of the air traffic control in the flight management computer. They do not expire after the flight has completeted. So a pilot could take them for current ones and not the ones of the last flight. The current work-around: Power cycling the aircraft or at least the flight management computer AstonishingSaturday, June 19. 2010
A good example how resilient aircraft engines are: The Avherald published some photos of an engine of an 777 that had to land at Schipol instead of Heathrow because of low fuel. The engine still delivered thrust. It had just a higher exhaust temperature and higher fuel burn according to other reports. At the moment it's believed this damage happened 5 hours before the landing in Schipol
Socket Filter Framework and KSSL FrameworkFriday, June 18. 2010
This morning two changes found their way into Opensolaris - "PSARC/2009/590 Socket Filter Framework" and "convert KSSL into a socket filter". The first change introduces a new framework for package filtering and manipulation. The design document states:
A filter is configured to work with one or more non-STREAM sockets and it can be attached either automatically to all matching sockets or programmatically to a specific socket by the request of an application. Once attached, the filter exists in the socket layer, but sits logically in between the socket and transport layers where it is notified of user requests and transport events via callback functions. The action a filter can take depend on the callback. But typically a filter can modify or deny socket operations, transform, delay and inject data, as well as defer the notification of new connections.The first usage of this framework is a new implementation of kssl, the in-kernel SSL proxy of Solaris.
Posted by Joerg Moellenkamp
in English, Solaris, Sun/Oracle
at
07:08
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PSARC/2010/144 - lofi in non-global zonesThursday, June 17. 2010
An interesting change found it's way to the code base of Opensolaris: lofi(7D) in non global zones. With this change you are able to create loopback (for example to mount DVD/CD images without burning them) devices from within a zone.
Posted by Joerg Moellenkamp
in English, Solaris, Sun/Oracle
at
20:00
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Recommended Solaris (and related topics) BooksWednesday, June 16. 2010
After my book recommendation i was asked for some other recommendations about Solaris. Hmm ... i will just include the books here, i've read on my own, there may be other good books. When you know such a book just drop me a note and an explanation why you think this book should be included into the list ("Want to sell more of my book" isn't a valid reason
Essentials - Beginners levelOpenSolaris Bible (Bible (Wiley))by Nicholas A. Solter, Jerry Jelinek, David MinerGood book to learn OpenSolaris. It elaborates on a lot of features of OpenSolaris and gives a good overview about the whole thing called OpenSolaris Solaris 10 Security Essentials (Solaris System Administration)Nice introduction into several security features of Solaris. I recommend it when you want to have a good overview about all the security features included in Solaris.Solaris 10 ZFS Essentials (Solaris System Administration)by Scott WatanabeYou will find all the infos of this book somewhere in the internet or in other books, but this book is a nice condensed summary of this topic on dead trees. Essentials - Intermediate levelSolaris Internals: Solaris 10 and Open Solaris Kernel Architectureby Richard McDougall, Jim MauroThere is no better way short of reading the source code to learn about the internal mechanisms like dispatching, filesystems, schedulers etc ... when it's not here, you have to look into the source or in some obscure blogs ... Solaris Performance and Tools: DTrace and MDB Techniques for Solaris 10 and OpenSolarisby Richard McDougall, Jim Mauro, Brendan Gregg It's essential when you learn DTrace and want to know how to work with the Modular Debugger in Solaris. Oracle Solaris 10 System Virtualization Essentials (Oracle Solaris System Administration)by Jeff Victor, Jeff Savit , and Gary CombsGood book about virtualization in conjunction with Solaris 10 DTrace: Dynamic Tracing in Oracle Solaris, Mac OS X and FreeBSDJim Mauro, Brendan Gregg, Chad Mynhier, Tariq Magdon-IsmailThe book about Dtrace. From my point of view a must have when you want to work with DTrace. Essentials - Advanced levelSolaris Systems Programming (Paperback)by Rich TeerWhen "Solaris Internals" goes deep into the mechanisms, this book goes even a step deeper. When you really want to know how something works in Solaris and how you use as a programmer, this is the right book. However i've put it into the advanced level for a reason. It isn't an easy read due to the topic of the book. Other TipsSunCluster. Hochverfügbarkeit unter Sun Solaris und OpenSolaris. The Fullmoon Frameworkby Rolf DietzeI'm somewhat divided about that book. I think from the technical side it's really good, it gives a good insight into Sun Cluster and you can learn a lot out of it. But the presentation ... well ... could be better. Even i was able to detect a lot of typos ... due to my extremely fast reading style i overlook typos normally, but here my reading flow stopped over at relatively frequent bugs. However i would recommend it, when you have no problems with typos in a book because of the content. And for readers in Germany it has a big advantage: It's in german language. That's really an advantage, as there are many people since the reunion who are still not that fluent in English as they would be in russian language. (Disclaimer: I got this book as a reviewer's copy) OpenSolaris für Anwender, Administratoren und Rechenzentren: Von den ersten Schritten bis zum produktiven Betrieb auf Sparc, PC und PowerPC basierten Plattformenby Rolf Dietze, Tatjana Heuser, Jörg Schilling Suffers the same typo problem and nowadays i recommend the OpenSolaris Bible. At the date of it's publication it was one of the few really good book about OpenSolaris. However this changed. But this book has an advantage in Germany ... it's in german language. (Disclaimer: I got this book as a reviewer's copy) Less known Solaris Features: CPU resource PoolsWednesday, June 16. 2010
After writing about the processor sets and their role in computing the number of garbage collection threads recently, there were some questions about configuring processor sets. In this article i want to explain the usage of resource pools in Solaris in regard of CPU resources. You don't configure the processor sets directly. Instead of this the pool facility does this for you.
I want to explain how to configure, how to use and how to monitor them. However i can just scratch the surface in such an article. Continue reading "Less known Solaris Features: CPU resource Pools"
Posted by Joerg Moellenkamp
in English, Solaris, Sun/Oracle
at
09:16
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I'm addicted to glasTuesday, June 15. 2010
Damned ... photography is an addiction ... just purchased the new Macro and now i'm looking for a new tele ....
Practical DTracingMonday, June 14. 2010
There is a simple reason why DTrace is such a great tool. I did the following steps while a production system ran at full speed at approx. 11:45 ... at the highest load of the day (the storm right before before lunch).
Continue reading "Practical DTracing" Less known Solaris features: hxbt - or: WAN emulationFriday, June 11. 2010
Some features are so "less known" that even people with the reputation of knowing almost everything about Solaris aren't aware of them. One of this features is the
hxbt driver. In this tutorial i want to explain how you get this drive and how you install and use it.Continue reading "Less known Solaris features: hxbt - or: WAN emulation"
Posted by Joerg Moellenkamp
in English, Solaris, Sun/Oracle
at
19:56
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Slowing down resilvering of ZFSWednesday, June 9. 2010
Most of the time you want your ZFS working as fast as possible, but there are occasions where you want to slow down thing a little bit not to disturb the real work too much. Resilvering or scrubing of a ZFS pool is such an example. A ZFS resilvering can be very resource hungry.
Now there is a mechanism to prevent the system from experiencing such a slowdown by reducing the speed of resilvering/scrubbing in favor of more important I/O . The code enabling Opensolaris to do so found its way to the source yesterday. The mechanism is relatively easy: Whenever there was a read or a sync write to an pool without seperate log in the last 50 timer ticks, there is an additional delay of 2(resilvering) or 4(scrubbing) ticks between the scan steps.
Posted by Joerg Moellenkamp
in English, Solaris, Sun/Oracle
at
09:09
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