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• ZFS for Database Log Files

  - by user12620111

  I've been troubled by drop outs in CPU usage in my application server, characterized by the CPUs suddenly going from close to 90% CPU busy to almost completely CPU idle for a few seconds. Here is an example of a drop out as shown by a snippet of vmstat data taken while the application server is under a heavy workload. # vmstat 1  kthr      memory            page            disk          faults      cpu  r b w   swap  free  re  mf pi po fr de sr s3 s4 s5 s6   in   sy   cs us sy id  1 0 0 130160176 116381952 0 16 0 0 0 0  0  0  0  0  0 207377 117715 203884 70 21 9  12 0 0 130160160 116381936 0 25 0 0 0 0 0  0  0  0  0 200413 117162 197250 70 20 9  11 0 0 130160176 116381920 0 16 0 0 0 0 0  0  1  0  0 203150 119365 200249 72 21 7  8 0 0 130160176 116377808 0 19 0 0 0 0  0  0  0  0  0 169826 96144 165194 56 17 27  0 0 0 130160176 116377800 0 16 0 0 0 0  0  0  0  0  1 10245 9376 9164 2  1 97  0 0 0 130160176 116377792 0 16 0 0 0 0  0  0  0  0  2 15742 12401 14784 4 1 95  0 0 0 130160176 116377776 2 16 0 0 0 0  0  0  1  0  0 19972 17703 19612 6 2 92  14 0 0 130160176 116377696 0 16 0 0 0 0 0  0  0  0  0 202794 116793 199807 71 21 8  9 0 0 130160160 116373584 0 30 0 0 0 0  0  0 18  0  0 203123 117857 198825 69 20 11 This behavior occurred consistently while the application server was processing synthetic transactions: HTTP requests from JMeter running on an external machine. I explored many theories trying to explain the drop outs, including: Unexpected JMeter behavior Network contention Java Garbage Collection Application Server thread pool problems Connection pool problems Database transaction processing Database I/O contention Graphing the CPU %idle led to a breakthrough: Several of the drop outs were 30 seconds apart. With that insight, I went digging through the data again and looking for other outliers that were 30 seconds apart. In the database server statistics, I found spikes in the iostat "asvc_t" (average response time of disk transactions, in milliseconds) for the disk drive that was being used for the database log files. Here is an example:                     extended device statistics     r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 2053.6    0.0 8234.3  0.0  0.2    0.0    0.1   0  24 c3t60080E5...F4F6d0s0     0.0 2162.2    0.0 8652.8  0.0  0.3    0.0    0.1   0  28 c3t60080E5...F4F6d0s0     0.0 1102.5    0.0 10012.8  0.0  4.5    0.0    4.1   0  69 c3t60080E5...F4F6d0s0     0.0   74.0    0.0 7920.6  0.0 10.0    0.0  135.1   0 100 c3t60080E5...F4F6d0s0     0.0  568.7    0.0 6674.0  0.0  6.4    0.0   11.2   0  90 c3t60080E5...F4F6d0s0     0.0 1358.0    0.0 5456.0  0.0  0.6    0.0    0.4   0  55 c3t60080E5...F4F6d0s0     0.0 1314.3    0.0 5285.2  0.0  0.7    0.0    0.5   0  70 c3t60080E5...F4F6d0s0 Here is a little more information about my database configuration: The database and application server were running on two different SPARC servers. Storage for the database was on a storage array connected via 8 gigabit Fibre Channel Data storage and log file were on different physical disk drives Reliable low latency I/O is provided by battery backed NVRAM Highly available: Two Fibre Channel links accessed via MPxIO Two Mirrored cache controllers The log file physical disks were mirrored in the storage device Database log files on a ZFS Filesystem with cutting-edge technologies, such as copy-on-write and end-to-end checksumming Why would I be getting service time spikes in my high-end storage? First, I wanted to verify that the database log disk service time spikes aligned with the application server CPU drop outs, and they did: At first, I guessed that the disk service time spikes might be related to flushing the write through cache on the storage device, but I was unable to validate that theory. After searching the WWW for a while, I decided to try using a separate log device: # zpool add ZFS-db-41 log c3t60080E500017D55C000015C150A9F8A7d0 The ZFS log device is configured in a similar manner as described above: two physical disks mirrored in the storage array. This change to the database storage configuration eliminated the application server CPU drop outs: Here is the zpool configuration: # zpool status ZFS-db-41   pool: ZFS-db-41  state: ONLINE  scan: none requested config:         NAME                                     STATE         ZFS-db-41                                ONLINE           c3t60080E5...F4F6d0  ONLINE         logs           c3t60080E5...F8A7d0  ONLINE Now, the I/O spikes look like this:                     extended device statistics                  r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 1053.5    0.0 4234.1  0.0  0.8    0.0    0.7   0  75 c3t60080E5...F8A7d0s0                     extended device statistics                  r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 1131.8    0.0 4555.3  0.0  0.8    0.0    0.7   0  76 c3t60080E5...F8A7d0s0                     extended device statistics                  r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 1167.6    0.0 4682.2  0.0  0.7    0.0    0.6   0  74 c3t60080E5...F8A7d0s0     0.0  162.2    0.0 19153.9  0.0  0.7    0.0    4.2   0  12 c3t60080E5...F4F6d0s0                     extended device statistics                  r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 1247.2    0.0 4992.6  0.0  0.7    0.0    0.6   0  71 c3t60080E5...F8A7d0s0     0.0   41.0    0.0   70.0  0.0  0.1    0.0    1.6   0   2 c3t60080E5...F4F6d0s0                     extended device statistics                  r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 1241.3    0.0 4989.3  0.0  0.8    0.0    0.6   0  75 c3t60080E5...F8A7d0s0                     extended device statistics                  r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device     0.0 1193.2    0.0 4772.9  0.0  0.7    0.0    0.6   0  71 c3t60080E5...F8A7d0s0 We can see the steady flow of 4k writes to the ZIL device from O_SYNC database log file writes. The spikes are from flushing the transaction group. Like almost all problems that I run into, once I thoroughly understand the problem, I find that other people have documented similar experiences. Thanks to all of you who have documented alternative approaches. Saved for another day: now that the problem is obvious, I should try "zfs:zfs_immediate_write_sz" as recommended in the ZFS Evil Tuning Guide. References: The ZFS Intent Log Solaris ZFS, Synchronous Writes and the ZIL Explained ZFS Evil Tuning Guide: Cache Flushes ZFS Evil Tuning Guide: Tuning ZFS for Database Performance

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• Install a Mirror without downloading all the packages in the official repository

  - by Sam

  I first gonna explain the situation : ( The two PCs are running Ubuntu 12.04 ) I have a Laptop which is connected to a wifi connection, and a Desktop which can not be connected to Internet ( the modem is too far from it ), and i want to install some software to the last one. ( the two PCs are connected with an Ethernet cable ) I've already searched for a solution, but all i found was the use of some softwares that should have been already installed on the "Internet-less PC". ( Keryx, APTonCD ... ) What I want to do is to create a mirror in my laptop which contain the packages i have in this one ( situated in /var/cache/apt/archive ) and i don't want to download all the packages from the official repository, I don't need them. Can someone tell me if this is possible ? Thank you.

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• Switching to WIF SessionMode in ASP.NET

  - by Your DisplayName here!

  To make it short: to switch to SessionMode (cache to server) in ASP.NET, you need to handle an event and set a property. Sounds easy – but you need to set it in the right place. The most popular blog post about this topic is from Vittorio. He advises to set IsSessionMode in WSFederationAuthenticationModule_SessionSecurityTokenCreated. Now there were some open questions on forum, like this one. So I decided to try it myself – and indeed it didn’t work for me as well. So I digged a little deeper, and after some trial and error I found the right place (in global.asax): void WSFederationAuthenticationModule_SecurityTokenValidated( object sender, SecurityTokenValidatedEventArgs e) {     FederatedAuthentication.SessionAuthenticationModule.IsSessionMode = true; } Not sure if anything has changed since Vittorio’s post – but this worked for me. While playing around, I also wrote a little diagnostics tool that allows you to look into the session cookie (for educational purposes). Will post that soon. HTH

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• All video thumbnails fail to be generated

  - by Forage

  Not a single video thumbnail is being generated and shown in Nautilus. The folder ~/.cache/thumbnails/fail/gnome-thumbnail-factory/ keeps getting filled for all of them. I tried removing all the thumbnails from the folder, reinstalling the gstreamer-plugins-... and totem packages, changing the thumbnail settings (Always, 4 GB) in the Preview section of the Nautilus preferences. All to no avail. Some recommend to install packages like libxine1 and ffmpegthumbnailer but this didn't not solve it either. There used to be an .xsession-errors error log file generated in the home folder in previous version of Ubuntu but that doesn't seem to be the case any more. I'm running Ubuntu 12.10 GNOME remix (x64) with the GNOME3 ppa packages installed. What could be the cause of the problem and how can I fix it?

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• #OOW 2012 : IaaS, Private Cloud, Multitenant Database, and X3H2M2

  - by Eric Bezille

  The title of this post is a summary of the 4 announcements made by Larry Ellison today, during the opening session of Oracle Open World 2012... To know what's behind X3H2M2, you will have to wait a little, as I will go in order, beginning with the IaaS - Infrastructure as a Service - announcement. Oracle IaaS goes Public... and Private... Starting in 2004 with Fusion development, Oracle Cloud was launch last year to provide not only SaaS Application, based on standard development, but also the underlying PaaS, required to build the specifics, and required interconnections between applications, in and outside of the Cloud. Still, to cover the end-to-end Cloud  Services spectrum, we had to provide an Infrastructure as a Service, leveraging our Servers, Storage, OS, and Virtualization Technologies, all "Engineered Together". This Cloud Infrastructure, was already available for our customers to build rapidly their own Private Cloud either on SPARC/Solaris or x86/Linux... The second announcement made today bring that proposition a big step further : for cautious customers (like Banks, or sensible industries) who would like to benefits from the Cloud value of "as a Service", but don't want their Data out in the Cloud... We propose to them to operate the same systems, Exadata, Exalogic & SuperCluster, that are providing our Public Cloud Infrastructure, behind their firewall, in a Private Cloud model. Oracle 12c Multitenant Database This is also a major announcement made today, on what's coming with Oracle Database 12c : the ability to consolidate multiple databases with no extra additional  cost especially in terms of memory needed on the server node, which is often THE consolidation limiting factor. The principle could be compare to Solaris Zones, where, you will have a Database Container, who is "owning" the memory and Database background processes, and "Pluggable" Database in this Database Container. This particular feature is a strong compelling event to evaluate rapidly Oracle Database 12c once it will be available, as this is major step forward into true Database consolidation with Multitenancy on a shared (optimized) infrastructure. X3H2M2, enabling the new Exadata X3 in-Memory Database Here we are :  X3H2M2 stands for X3 (the new version of Exadata announced also today) Heuristic Hierarchical Mass Memory, providing the capability to keep most if not all the Data in the memory cache hierarchy. Of course, this is the major software enhancement of the new X3 Exadata machine, but as this is a software, our current customers would be able to benefit from it on their existing systems by upgrading to the new release. But that' not the only thing that we did with X3, at the same time we have upgraded everything : the CPUs, adding more cores per server node (16 vs. 12, with the arrival of Intel E5 / Sandy Bridge), the memory with 512GB memory as well per node,  and the new Flash Fire card, bringing now up to 22 TB of Flash cache. All of this 4TB of RAM + 22TB of Flash being use cleverly not only for read but also for write by the X3H2M2 algorithm... making a very big difference compare to traditional storage flash extension. But what does those extra performances brings to you on an already very efficient system: double your performances compare to the fastest storage array on the market today (including flash) and divide you storage price x10 at the same time... Something to consider closely this days... Especially that we also announced the availability of a new Exadata X3-2 8th rack : a good starting point. As you have seen a major opening for this year again with true innovation. But that was not the only thing that we saw today, as before Larry's talk, Fujitsu did introduce more in deep the up coming new SPARC processor, that they are co-developing with us. And as such Andrew Mendelsohn - Senior Vice President Database Server Technologies came on stage to explain that the next step after I/O optimization for Database with Exadata, was to accelerate the Database at execution level by bringing functions in the SPARC processor silicium. All in all, to process more and more Data... The big theme of the day... and of the Oracle User Groups Conferences that were also happening today and where I had the opportunity to attend some interesting sessions on practical use cases of Big Data one in Finances and Fraud profiling and the other one on practical deployment of Oracle Exalytics for Data Analytics. In conclusion, one picture to try to size Oracle Open World ... and you can understand why, with such a rich content... and this only the first day !

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• How to determine the version and origin of proprietary drivers installed by Additional Drivers?

  - by Bribles

  How can I tell which version and from which repository the Additional Drivers tool is trying to install the fglrx graphics driver? It says that I have a different version of the driver in use. I installed the driver from maverick/restricted and apt-cache tells me it's from a regular Ubuntu mirror. The installed version is the same as the candidate version. Can I get Additional Drivers to tell me what it would install if I activated the driver through it? Is it possible Additional Drivers just assumes it's a different version since it was installed by a different process?

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• My colleague can't visit our website through her provider after long downtime

  - by Peter Westerlund

  We did a frontpage update some days ago that caused the site to crash. The site was down for several hours. After troubleshooting, we concluded that we needed to cache more content. It had been run too many queries. After solving that and rebooting of server, we here in Sweden and Norway were again able to visit the site. But a colleague in Tunisia couldn't. It seems to work from another internet provider but not her own. What could have happened? And what should we do? Edit: I should add: She is able to visit the site through tunnel at anonymouse.org.

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• Trouble with 12.10 lag

  - by Brennan

  Well basicly lately I have been having lag problems with 12.10. I will post my specs, but before the update to 12.10, it said that I had intel graphics. Now it says I have Gallium. My specs: *Memory: 3.9 GiB *Processor: Pentium(R) Dual-Core CPU E5500 @ 2.80GHz × 2 *Graphics: Gallium 0.4 on llvmpipe (LLVM 3.2, 128 bits) (used to say intel graphics) *OS Type: 32-bit *Disk: 486.1 GB The output of the command sudo apt-cache check is this: E: Invalid operation check The output of the command sudo lspci -nnk | grep -A5 VGA is this: 00:02.0 VGA compatible controller [0300]: Intel Corporation 4 Series Chipset Integrated Graphics Controller [8086:2e32] (rev 03) Subsystem: ASUSTeK Computer Inc. Device [1043:836d] Kernel driver in use: i915 00:1b.0 Audio device [0403]: Intel Corporation NM10/ICH7 Family High Definition Audio Controller [8086:27d8] (rev 01) Subsystem: ASUSTeK Computer Inc. Device [1043:8445] Kernel driver in use: snd_hda_intel

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• Advertising cookies ( ad sense ) on google chrome [closed]

  - by zack

  ok first I'm not sure if this is right stackexchange site to ask but I'm not sure if there is better one as question is quite general When I visit one site, and if this site runs google adsense campaign, I can see its ads on other sites. I suppose this is cookie from this site and than it's showing ads using the cookie However, I removed this specific cookie and cleared cache, and I can still see this same ad showing on other sites running adsense My question is, is there is something wrong with google chrome, is there a possibility that Google stores data within google chrome itself? If not, how else they could trace which ads to show?

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• Share on Facebook does not show thumbnail images

  - by matt74tm

  I have a PHP application which has a "Share on Facebook" button that, On the development server shows the thumbnail images correctly and allows the user to select between them On the live server, it does NOT show the thumbnail images at all. The relevant portion of the .htaccess file is: # Set up caching on media files for 2 days <FilesMatch "\.(gif|jpg|jpeg|png|flv)$"> ExpiresDefault A172800 Header append Cache-Control "public" </FilesMatch> I'm using the exact same set of php files and .htaccess, but the server configuration is different. What could be causing this? Note that the text appears fine. Edit1 We are also doing some URL rewriting related to images in the .htaccess (on both servers): ... RewriteRule ^.*/content/image/(.*)$ content/image/$1 [L] ... RewriteRule ^.*/images/(.*)$ images/$1 [L] ... Would that be somehow making a difference? Images appear fine all throughout the site. (I posted this question earlier as http://stackoverflow.com/questions/4142597/share-on-facebook-does-not-show-thumbnail-images) )

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• Install a Mirror without downloading all packages from official repository

  - by Sam

  I first gonna explain the situation: I have a Laptop which is connected to a wifi connection, and a Desktop which can not be connected to Internet (the modem is too far from it), and i want to install some software on the last one. (The two PCs are running Ubuntu 12.04, and are connected with an Ethernet cable) I've already searched for a solution, but all I've found was the use of some softwares that should have been already installed on the "Internet-less PC". ( Keryx, APTonCD ... ) What I want to do is to create a mirror in my laptop which contain the packages i have in this one ( situated in /var/cache/apt/archive ) and i don't want to download all the packages from the official repository, I actually don't need them. Can someone tell me if it is possible to do that ? Thanks,

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• Ask the Readers: How Do You Score Free Wi-Fi While Traveling?

  - by Jason Fitzpatrick

  The holiday season is in full swing and that means many of us will be traveling–and searching for Wi-Fi nodes in the process. Help your fellow readers out by sharing your best Wi-Fi finding tips and tricks. Internet access is a necessity for the modern traveler but finding it is a bit more difficult than simply plugging into your home Wi-Fi. This week we want to hear all about your tips, tricks, and methods for scoring free Wi-Fi service in your interstate (and even international) travels. How do you keep the bounty of the internet flowing to your laptops, netbooks, tablets, and smart phones as you traverse the world? Sound off in the comments with your best tips and then check back on Friday for the What You Said roundup. HTG Explains: Understanding Routers, Switches, and Network Hardware How to Use Offline Files in Windows to Cache Your Networked Files Offline How to See What Web Sites Your Computer is Secretly Connecting To

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• Caching strategies - LRU, MRU, Clock-Pro

  - by golgofa

  I am going to write a bachelor's science work on caching strategies and really, can't find any links to specifications or full descriptions of some of them. Only something like summaries from wikipedia. Please, help with some links on LRU, MRU caching and new-one - Clock Pro. Thanks a lot. All links are very useful for me. The purpose of work - is to compare different cache strategies to get more effiency. It based on WebApplication with ejb 2.0, so algorithm's will be implemented there, espesially in ejbLoad() and ejbFindByPrimarKey(). Also, one of aspects of this application - it will use not common scheme of tables in database - it based on metamodel. So, if you had any experience on this topic, i would be grateful to take some of your knowledge)

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• Is MUMPS alive?

  - by ern0

  At my first workplace we were using Digital Standard MUMPS on a PDP 11-clone (TPA 440), then we've switched to Micronetics Standard MUMPS running on a Hewlett-Packard machine, HP-UX 9, around early 90's. Is still MUMPS alive? Are there anyone using it? If yes, please write some words about it: are you using it in character mode, does it acts as web server? etc. (I mean Caché, too.) If you've been used it, what was your feelings about it? Did you liked it?

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• How to compile Asus-syntec-webcam-driver stk11xx

  - by berot3

  i have asus v1s and some time ago i was able to easily compile and install it. but now compiling fails... i hope u guys know what i can do, if there is anything that can be done... after svn checkout https://syntekdriver.svn.sourceforge.net/svnroot/syntekdriver syntekdriver and cd ./syntekdriver/trunk/driver as well as make -f Makefile.standalone i got: make -C /lib/modules/2.6.36.2/build SUBDIRS=/home/berot3/syntekdriver/trunk/driver modules make[1]: Betrete Verzeichnis '/usr/src/linux-headers-2.6.38-8-generic' CC [M] /home/berot3/syntekdriver/trunk/driver/stk11xx-usb.o CC [M] /home/berot3/syntekdriver/trunk/driver/stk11xx-v4l.o /home/berot3/syntekdriver/trunk/driver/stk11xx-v4l.c:43:28: fatal error: linux/videodev.h: File not found! compilation terminated. make[2]: *** [/home/berot3/syntekdriver/trunk/driver/stk11xx-v4l.o] Error 1 make[1]: *** [_module_/home/berot3/syntekdriver/trunk/driver] Error 2 make[1]: Verlasse Verzeichnis '/usr/src/linux-headers-2.6.38-8-generic' make: *** [driver] Error 2 same for http://bookeldor-net.info/merdier/Makefile-syntekdriver http://webcache.googleusercontent.com/search?q=cache:OM0zVNlYiVQJ:bookeldor-net.info/merdier/Makefile-syntekdriver+http://bookeldor-net.info/merdier/Makefile-syntekdriver&hl=de&strip=1

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• google earth 7, 32bit in 12.10 runs without error but there is no image (globe)

  - by Dennis

  Everything seemed to install fine. I can start google earth and all layers are available, I can even zoom in and look at 3-D buildings. But there is absolutely no image data displayed at all. If you look at the whole globe the outlines are there on an invisible globe. As you zoom in the base looks dark grey almost black but there is no image. I have tried. Tools Options Graphics Safe Mode Tools Options Texture colors all combinations Tools Options Cache (tried several changes to the numbers) lspci shows Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03) Running on a Dell Inspiron 6000 laptop (1.5Gb memory)

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• Apt-Daemon problem due to a broken sun-java6-jre package

  - by Marv

  I am having problems with installation with everything in the software center. Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 968, in simulate trans.unauthenticated = self._simulate_helper(trans) File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 1092, in _simulate_helper return depends, self._cache.required_download, \ File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 235, in required_download pm.get_archives(fetcher, self._list, self._records) SystemError: E:I wasn't able to locate a file for the sun-java6-jre package. This might mean you need to manually fix this package. Help?

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• Mobile music playback on android phone keeps buffering

  - by ianio

  I have copied some music to a ubuntu synced folder on my karmic machine. I have the Ubuntu One android app installed on android 2.2 phone. When listening to music I get frequent breaks whilst the music is buffering, even with full signal. every other music streaming servie such as last fm and bbc player are fine. What is going wrong? mp3s should not have trouble buffering over a good 3g signal. I have set cache size to 200mb but i cant find a buffer size. Is it my mp3s? they are usually in the order of 320kb/s this is a breaker for me if there is no solution which is a massive shame as i like the principal of the software. cheers

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• Is shared hosting enough for feed reader app?

  - by Mahdi

  I'm developing an Feed reader app. Feeds are downloaded to my server when someone requests it. then they download to user's computer. There will be 1-2 minutes cache for popular feeds. We expect that there will be 1000-5000 users (that use our app) Is a shared hosting (which currently serves almost 100 website, and it will serve 500 websites at maximum) enough for this purpose? or we should look for VPS or Dedicated hosting? Note: Our shared hosting plan has unlimited disk space and unlimited bandwidth.

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• Specific website not working on my connection [closed]

  - by Tsury

  For some reason, the website http://www.woopra.com/ doesn't work well (shows as plain html, no css/images/JS) on my computer and my Android tablet (they both share the same internet connection). It does however, work on my WP 7.5 phone (3G). When I try to set a wifi hotspot and use the tablet it still doesn't work (tried to clean cache). I tried FF, Chrome and IE (multiple versions). What is going on here? I'm clueless! Thanks.

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• Should I tell a departed coworker about their "sev 1" defect?

  - by noahz

  I had a co-worker leave our company recently. Before leaving, he coded a component that had a severe memory leak that caused a production outage (OutOfMemoryError in Java). The problem was essentially a HashMap that grew and never removed entries, and the solution was to replace the HashMap with a cache implementation. From a professional standpoint, I feel that I should let him know about the defect so he can learn from the error. On the other hand, once people leave a company, they often don't want to hear about legacy projects that they have left behind for bigger and better things. What is the general protocol for this sort of situation?

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• How do I install Ubuntu to a USB key?

  - by badp

  If you are hurrying to reply, System ? Administration ? StartUp Disk Creator -- no, that's not what I'm talking about. I want to try Ubuntu 11.04's Unity without touching my existing Ubuntu install. To do this, I need to install the nVidia drivers first (sigh). To do this, I need changes to persist a reboot. To do this, I need to really install Ubuntu on a USB key. How do you do that? What I tried I tried to make a USB key from Testdrive, then boot from it, then choose "Install Ubuntu." The installer refused to install to the installation media itself. I tried, from my installed copy of Ubuntu: sudo kvm /dev/sdb --cdrom .cache/testdrive/iso/ubuntu_natty-desktop-i386.iso ...but the installer didn't detect the disk properly.

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• Google I/O 2012 - High Performance HTML5

  Google I/O 2012 - High Performance HTML5 For years we built web apps that far outpaced the capabilities of the browsers they ran in. Just as the browsers were catching up HTML5 came on the scene - video and audio, canvas, SVG, app cache, localStorage, @font-face, and more. Now the browsers are racing to stay ahead of the wave that's building as developers adopt these new capabilities. Is your HTML5 app going to ride the wave or be dashed on the rocks leaving users stranded? Learn which HTML5 features to seek out and which to avoid when it comes to building fast HTML5 web apps. This session will be live captioned. From: GoogleDevelopers Views: 91 1 ratings Time: 01:02:07 More in Science & Technology

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• Wireless always disconnect

  - by Silas

  I upgraded my Ubuntu 10.10 for Ubuntu 12.04. I have a Emachines E625 With Ubuntu 12.04 my wireless always disconnects every 10 sec. It didn't do that with 10.10. Here is my config: Linux sylvain-eMachines-E625 3.2.0-30-generic #48-Ubuntu SMP Fri Aug 24 16:54:40 UTC 2012 i686 athlon i386 GNU/Linux total used free shared buffers cached Mem: 1759 1425 333 0 46 925 -/+ buffers/cache: 452 1306 Swap: 1788 0 1788 02:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01) 05:00.0 Ethernet controller: Atheros Communications Inc. AR8132 Fast Ethernet (rev c0) I will really enjoy an answer to solve this problem. Thank you in advance! Silas

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• Did Google Delete my index?

  - by Sei

  I have a website that I haven't had much time to take care of. I updated it 4 times since last October, the contents are all original and informative. I can see those cache from Way back Machine and the site was indexed in Yahoo, but not in google. Did I get my index on Google deleted because I did not update it often? Normally Google crawl often and index fast, I just got really worried if I did something wrong. Is it possible that I set something wrong in the hosting or something? Please help me

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