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• Disable disk caches in AWS EBS for PostgreSQL?

  - by Alexandr Kurilin

  It's my understanding that, without correctly disabling OS-level and drive-level caching, there is a chance that in case of system failure the Write-Ahead Log might not be saved correctly and in fact might get corrupted, possibly preventing data recovery. I've already made sure that wal_sync_method=fdatasync however I was unable to make any configuration changes with hdparm since I get the following: $ sudo htparm -I /dev/xvdf /dev/xvdf: HDIO_DRIVE_CMD(identify) failed: Invalid argument Looks like that option is not available in the kind of setup you get in EC2. Am I missing anything here? Are there any other obvious caches I have to disable to ensure the WAL's safety?

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• Build & Install Ruby Gems with Rake

  - by kerry

  Are you using rake to build your gems?  Have you ever wished there were an install task to install it to your machine?  I, for one, have written something like this a few times: 1: desc 'Install the gem' 2: task :install do 3: exec 'gem install pkg/goodies-0.1.gem' 4: end 5:  That is pretty straightforward.  However, this will not work under JRuby on Mac where the command should be ‘jgem’.  So we can enhance it to detect the platform, and host OS: 1: desc 'Install the gem' 2: task :install do 3: executable = RUBY_PLATFORM[/java/] && Config::CONFIG[/darwin/] ? 'jgem' : 'gem' 4: exec "#{executable} install pkg/goodies-0.1.gem" 5: end This is a little better.  I am still not comfortable with the sloppiness of building a shell command and executing it though.  It is possible to do it with strictly Ruby.  I am also going namespace it to integrate better with the GemPackageTask.  Now it will be accessed via ‘rake gem:install’ 1: desc 'Install the gem' 2: namespace 'gem' do 3: task :install do 4: Gem::Installer.new('pkg/goodies-0.1.gem').install 5: end 6: end   I have included this in the goodies gem 0.2, so go ahead and install it!  ‘gem install goodies’

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• Palm software that can turn the Palm IR keyboard into a Bluetooth keyboard for PC?

  - by Stu

  I had this kooky idea this morning. I love my foldout palm keyboard, but it only speaks IR to my Palm Treo. But it also has a Bluetooth radio so I thought wouldn't it be just keen to have a program that runs on the Treo that reads from the IR the keyboard and exposes it as a Bluetooth keyboard for a PC. I realize I'm way late to the game because there's so little information about the Palm anymore. I was thinking of writing this software if it wasn't too big of a deal, but I figured I'd see if anybody knew of such a project already in existence or something like it that I could piggyback off of. Not even sure if I can get the Palm OS Developers' kit anymore....

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• Deny users in a certain group access to dovecot

  - by celil

  I installed the dovecot-imapd package in Ubuntu, and my setup is as follows: $ sudo dovecot -n # 1.2.9: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-27-generic-pae i686 Ubuntu 10.04.1 LTS log_timestamp: %Y-%m-%d %H:%M:%S protocols: imaps login_dir: /var/run/dovecot/login login_executable: /usr/lib/dovecot/imap-login mail_privileged_group: mail mail_location: maildir:~/Maildir mbox_write_locks: fcntl dotlock auth default: passdb: driver: pam userdb: driver: passwd For security reasons I would like to deny all users that are in the admin group ability to do imap login via dovecot. This is done in order to prevent a brute force attacker from discovering the admin passwords, and obtaining administrator privileges on the system. How can this be achieved? Presumably, I will have to modify some settings in /etc/dovecot/dovecot.conf, but I am hesitant to change the default settings lest I create other security vulnerabilities.

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• What prevents Windows from entering standby?

  - by Arne

  Is there a tool or method to find out, what prevents Windows Vista 32 bit from entering the standby mode? My home pc is set to standby after a certain time of inactivity. But quite often it just stays awake and I have know idea why. I know of things that will keep it awake and already checked devices and network to no avail. I suspect there is some application or service that tells the os to stay active and I hope there is some tool to find the culprit.

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• Mono is frequently used to say "Yes, .NET is cross-platform". How valid is that claim?

  - by Thorbjørn Ravn Andersen

  In What would you choose for your project between .NET and Java at this point in time? I say that I would consider the "Will you always deploy to Windows?" the single most important (EDIT: technical) decision to make up front in a new web project, and if the answer is "no", I would recommend Java instead of .NET. A very common counter-argument is that "If we ever want to run on Linux/OS X/Whatever, we'll just run Mono", which is a very compelling argument on the surface, but I don't agree for several reasons. OpenJDK and all the vendor supplied JVM's have passed the official Sun TCK ensuring things work correctly. I am not aware of Mono passing a Microsoft TCK. Mono trails the .NET releases. What .NET-level is currently fully supported? Does all GUI elements (WinForms?) work correctly in Mono? Businesses may not want to depend on Open Source frameworks as the official plan B. I am aware that with the new governance of Java by Oracle, the future is unsafe, but e.g. IBM provides JDK's for many platforms, including Linux. They are just not open sourced. So, under which circumstances is Mono a valid business strategy for .NET-applications? Edit: Mark H summarized it as: "If the claim is that "I have a windows application written in .NET, it should run on mono", then not, it's not a valid claim - but Mono has made efforts to make porting such applications simpler.".

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• Simulate analogue steering wheel input from third party software like xPadder

  - by David Jensen

  So. I currently have a steering wheel connected to my htpc. Since it wont work / get recognized by all games i play. I use xpadder to play for example Grid 3. As far as i have understood, it simply presses the associated arrow key when i turn the wheel. What i would like, is a software to simulate more and more frequent key presses of the arrow keys the more i turn the wheel. Example: Tilting a little - 100 presses / second Tilting more - 200 presses / second Tilting max - Hold down key Because what i currently do with the wheel is constantly shaking it a bit right, when i just want to turn a little bit right and so on. Os : W8

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• Can't Create New folder in my video folder

  - by tiki

  My OS is windows 7 Ultimate 32bit. My video folder location is C:\Users\User\Documents\Downloads\Video. I Can't create folder in the Video folder or see the files i saved. But I can see the files in the root location of the folder i.e by going to the folder from My Computer. I can create and find files when I go to the folder My Computer>C>Users>User>Documents>Downloads>Video. This is an unusual problem I have never seen. Even being a system Administrator I can't able to fix the problem. Please help me out. Thanks in advance

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• Moving a VM from MS Virtual Server R2 to VirtualBox

  - by AngryHacker

  I have a Windows 2000 Professional VM happily running under MS Virtual Server R2 on WindowsXP. I need to move it to a different PC and the only one available is a Mac with VirtualBox on it. Theoretically, VirtualBox accepts .VHD files out of the box, but my attempts to run my VHD on VirtualBox resulted in failure. The Guest OS just keeps rebooting. I've attempted to get help on the VirtualBox forums, and they said that the VM image must first be prepped for the move, but could not give me any specifics. Anyone here know what is specifically involved in moving a Win2k .VHD to VirtualBox on the Mac?

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• OpenWrt Backfire 10.03 Frequently Becoming Unresponsive (Bridged Client)

  - by Christopher Parker

  I have a Linksys WRT54G version 2 that I've flashed with OpenWrt Backfire 10.03. It's acting as a bridged client using the wl.o driver to give me network access in my home office, which is in a far corner of my house in a position that would make it exceedingly difficult to fish network cabling in through the walls. I have three network-ready devices attached to the device that don't currently support WiFi, including a networked printer. Ever since I migrated from WhiteRussian, which was also set up as a bridged client, to Backfire, the device has been becoming unresponsive, as though the OS itself has crashed or frozen. The WLAN light becomes completely solid and the LAN lights stay mostly solid, blipping off and then back on again maybe once a second or so. They all blink more or less in unison. Is there some way I can diagnose why this is happening so I can fix it? Right now, the only way to fix it is to unplug the device and plug it back in.

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• pip install very slow through virtual box

  - by AJP

  pip install --exists-action=w -r requirements.txt is very very slow through virtual box. Any suggests of how to diagnose and fix? Would seeing the VagrantFile be useful? VirtualBox 4.2.12 (can't upgrade to .14 as it doesn't work.) Vagrant 1.0.7 Host machine: ProductName: Mac OS X ProductVersion: 10.7.5 BuildVersion: 11G63b VagrantFile contains: Vagrant::Config.run do |config| config.vm.box = "precise64" config.vm.customize ["modifyvm", :id, "--memory", 2048] config.vm.box_url = "http://files.vagrantup.com/precise64.box" config.vm.network :hostonly, "33.33.33.21" config.vm.forward_port 5000, 5000 config.vm.forward_port 5555, 5555 config.vm.share_folder "v-root", "/vagrant", "./" Vagrant::Config.run do |config| config.vm.provision :shell, :inline => "VENV=/usr/local/venv bash /vagrant/setup_env.sh" end end Normal download speed is only about 5 times slower at 0.8 Mb per second versus 4 MB per second (as judged by curling a 50 Mb file from S3). But pip install is taking about 20 times longer from Mac (i.e. about 40 minutes) versus 2.

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• Raid Shows Up as Multiple Drives - Can't Mount

  - by manyxcxi

  I have a single hard drive that the OS is installed on and I have Sil raid card installed with two matching 500GB hdds set up in Raid 0 and formatted- they're completely empty. For whatever reason they are showing up as /dev/sdb and /dev/sdc and not as a single hard drive. I used fdisk to format both raid drives as Linux raid auto (fd) but I cannot mount either device and dmraid doesn't seem to want to work, what step am I missing? When I installed 9.04 oh so long ago it seems like it recognized and automatically did everything that needed to be done, now I'm stuck. dmraid Output root@tripoli:~# dmraid -r /dev/sdc: sil, "sil_biaebhadcfcb", stripe, ok, 976771072 sectors, data@ 0 /dev/sdb: sil, "sil_biaebhadcfcb", stripe, ok, 976771072 sectors, data@ 0 root@tripoli:~# dmraid -ay RAID set "sil_biaebhadcfcb" already active fdisk Output root@tripoli:~# fdisk -l Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000b9b01 Device Boot Start End Blocks Id System /dev/sda1 * 1 32 248832 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 32 60802 488134657 5 Extended /dev/sda5 32 60802 488134656 8e Linux LVM Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x6ead5c9a Device Boot Start End Blocks Id System /dev/sdb1 1 60801 488384001 fd Linux raid autodetect Disk /dev/sdc: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xe6e2af28 Device Boot Start End Blocks Id System /dev/sdc1 1 60801 488384001 fd Linux raid autodetect

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• iMessage program for Windows or similar?

  - by Gabe

  iMessage (desktop app) is only for OS X and it's not clear if they'll bring it to Windows. I'd like to send text messages or iMessage texts using my computer. I have an iPhone iOS 5, jailbroken. I came across this article which allows you to send text messages using the same phone number as your cell phone (this is key) through your computer, but it's only for Android. http://howto.cnet.com/8301-11310_39-57458789-285/send-texts-from-your-computer-with-mightytext/?tag=rb_content;main Also found this question searching on SU but again only for Android. How do I send SMSes from my computer through an Android phone? Windows 7

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• How to achieve reliable Gigabit Ethernet Link with my Acer Aspire Revo R3610?

  - by The Operator

  I want to stream HD movies over my wired Gigabit LAN from my PC to my Acer Aspire Revo R3610. It's connected with a 3ft Cat5e patch cable to my Netgear GS605v2 Switch. The PC acting as File Server is connected at 1Gbps to the Switch. Network driver options are set to defaults, including automatic speed/duplex negotiation on both machines. The Revo will not connect to my Network Switch at 1Gbps - the OS reports that it reverts to 100Mbps either shortly after connection or immediately upon connection. Through a process of elimination (trying different drivers, patch cables, ports on the switch, and other 1Gbps-capable devices connected to the Network switch which successfully achieve 1Gbps links and performance) I have drawn the conclusion there is either a Hardware or Software (Driver) issue with the Revo itself. I have performed tests using Windows 7 and Ubuntu 9.10. Can anyone offer insight on Gigabit Ethernet with the Revo?

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• In terms of performance, which processor is more suitable?

  - by Roberts

  My computer specs: Motherboard: Gigabyte GA-945PL-S3 OS: Microsoft Windows 7 Ultimate CPU Socket: LGA775 CPU: Intel® Core™2 Duo Processor E4300 (2M Cache, 1.80 GHz, 800 MHz FSB) After I bought new hard drive (Western Digital 250GB, 7200rpm, 32MB, Sata III, Caviar Blue, WD2500AAKX) I saw that my processor temperature started to raise to higher value then before. Now while surfing internet it goes to 70°C. Cleaned my motherboard - nothing; cleaned fan - nothing; replaced thermal paste - nothing; replaced thermal paste with care - still nothing. So I went to friend just to check if he doesn't have any spear fan, and he did. But with fan he had another processor that he didn't need and he wanted to give it to me, but I told him that I will think about this. So my CPU, he's CPU (Intel® Pentium® D Processor 820 (2M Cache, 2.80 GHz, 800 MHz FSB)). Question: which proccesor is better for gaming and for recording games?

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• How does the build quality of laptops compare?

  - by pgwillia

  I'm looking to replace my 5 year old laptop. I want my next laptop to endure at least this long. I typically have Thunderbird, Firefox, Eclipse Java IDE, Skype, a ssh session, and Apache Tomcat running. I'm currently running Karmic Ubuntu, but am agnostic about operating system and would move to Win 7 or OS X. I frequently travel with this computer. I also value battery longevity and power conservation (if possible). Above all I'm looking to minimize cost. I think the hardware that best meets my needs is an Intel i7 processor, 8 GB RAM, 100GB @7200 rpm or SSD hardrive, and about 15 inch monitor. These specs are met by most brands. Does anyone know specific pros/cons and build quality for Macbook Pro, Lenovo Thinkpad (W510 or T510), Sony's VPC-F1190, and ASUS G Series G73JH-X1 NoteBook? Are all i7 processors created equal? Do you have other suggestion that meet my needs?

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• Is there way to scan a registry hive on an attached USB drive?

  - by johnny

  I have a hard drive with a virus that I removed from a PC. I can scan the file system of it as an attached USB drive. But how do I scan the registry of that USB drive since it is not booted up like a regular hard drive? Thank you EDIT: To clarify, the USB drive was a regular hard drive in a PC that got infected. I cannot boot into the OS to run a scan. I removed it to attach it to a working PC so I can scan its file system. But, I cannot scan the registry of that hard drive because that drive is not booted up. The hard drive was a regular XP hard drive install that I removed to scan as an attached drive (with an adapter to make it a USB drive.)

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• How to test KVM guest CPU maximum allocation limit?

  - by Ace

  Running Ubuntu 13.04 Host and vm Guest. Using virtio for hdd, nic. Max-allocaion CPU cores is 6, minimum is 2. Ive made a vm with virt-manager just to play with, and to test out kvm. Alright, I have a decent understand how the memory balloon driver works, but I still dont know how to test if the guest OS can utilize the max setting for cpu cores. From what i gather, the host will start one thread of qemu for each core allocated per vm. When i run htop inside the guest, it only shows two cores. (also here is the output of cat /proc/cpuinfo: https://gist.github.com/anonymous/93a361545130923537da ) How can I "force" the guest to allocate the other 4 cores so that it can show 6 cores in htop? Is there a way to do this?

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• Windows 7 Not Booting After Moving Partition

  - by Guillermo Phillips

  I have a Sony Vaio laptop. After using GParted to move the primary Windows partion, the laptop no longer boots, saying 'Operating system not found'. I don't have a recovery disc and the only other machine I have access to is a Mac Mini. I have tried creating a bootable USB using the recovery ISO from Microsoft. I can see all the files on the USB stick from my Mac. I followed the instructions here: http://borgstrom.ca/2010/10/14/os-x-bootable-usb.html I have set the laptop BIOS boot order to be 'External' first, but the laptop refuses to boot from the USB stick. I have previously been able to boot from a linux installation on the USB stick. Any help or ideas would be appreciated.

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• Speeding up remote X sessions

  - by Alexander Gladysh

  I have a remote machine running Ubuntu 11.10 Server, to which I connect via SSH from OS X 10.7.3: Host remote.example.com ForwardX11 yes ForwardX11Trusted yes Sometimes I want to launch a GUI application there (most notably, gitk). But UI is rather slow. Both remote machine and my own Mac have good internet connection. Ping between them is about 55ms, and there is no packet loss. Is there something I can do to speed things up? Setting up some other remote desktop solution is an option, but I'd like to avoid it since I don't need this application very often.

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• Cam being used by another application

  - by w35t

  On my laptop doesn't work any camera. I get error: "Camera being used by another application"". I don`t known which program using it. I tried use software like "SplitCam" or "ManyCam". Also I reinstalled K-lite codec to newest, but still getting this error. I get the same error when I turn my Canon video camera to laptop using firewire cable. OS: Windows 7 x64 Camera: Creative (i don`t find which model) Laptop: DELL inspiron 1520 Error when I tried open SplitCam: http://f.imagehost.org/0759/Clipboard03.png SplitCam error when repair it: http://i.imagehost.org/0607/split.png ManyCam just not responding. SonyVegas error: http://f.imagehost.org/0227/Clipboard05.png Sorry for my English. Thanks for any help.

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• (PHP vs Python vs Perl) vs Ruby [closed]

  - by Dr.Kameleon

  OK, here's what : I've programmed in over 20 different languages and now, because of a large project I'm currently working on for Mac OS X (in Objective-C/Cocoa), I need to make a final decision on which language to use for my background scripting + plugin functionality. Definitely, one factor that'll ultimately influence my decision is which one I'm most familiar with, which is PHP (one of the ugliest languages around, which I however adore... lol), then Python / Perl (the "proven values"... )... and then Ruby (which, to me, is almost confusing and I've only played with it for some time.) Now, here's my considerations : (As previously mentioned) Being familiar with it (anyway, if X is better in my case, I really don't mind studying it from scratch...) Speed Good interaction with the Shell + ease of integration with my Cocoa application Btw, some of the reasons that made me wonder if Ruby would be a good choice is : The hype around it (although, I still don't get why; but that's probably just me...) My major competitor (we're actually talking about the same type of software here) is using Ruby for its backend scripting almost exclusively (ok, along with some BASH). Isn't Ruby considered slower e.g. than Perl? Why did he choose that? Simply, a matter of personal taste? So... your thoughts?

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• How to create a bootable Ubuntu Linux (10.04) USB installation for Macintosh

  - by vdavidovski

  I tried searching the Internet, but could not find a decent tutorial explaining how to create a bootable Ubuntu Linux (10.04) USB installation that could be run not only on a PC but also on Macs and MacBook Pros. In addition, I tried refit, but ended with "Missing operating system" error. Here is basically the layout of my bootable under PC Ubuntu USB drive (using MBR): Partition 1 (ext3, bootable) - Ubuntu Linux 32 bit, contains also grub2 bootloader. Partition 2 (ext3) - Ubuntu Linux 64 bit. Partition 3 (fat32) - contains data. What would be the best way to enable this drive to boot under Mac OS X? And if refit has to be used, could I simply have one more partition on the USB drive containing it? Thanks!

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• How does operating system software maintains time clocks?

  - by Neeraj

  Hi everyone, This may sound a bit less relevant but I couldn't think of a better place to ask this question. Now consider this situation, you install an OS on your system, set the timezone and time, do some stuff and turn it off. (Note that there is no power going in to the computer). Now next time (say after some hours or days) you turn it on again, and you see the updated time. How is this possible even when my computer is not connected to the internet and was consuming no power during the period it was down.(Is there some kind of hardware hack?) please clarify!

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• MongoDB on FreeBSD

  - by Hartator

  We are currently using MongoDB 2.0.0 on MacOS but our servers are running FreeBSD. The most recent port of MongoDB is the 1.8.3 version. I have tried to compile the 2.0.0 by hand but I came across errors that I didn't manage to fix. I came across on the Internet a few old resources which are saying that MongoDB does not run well on FreeBSD mainly for performance issue (memory mapped files). Is that true ? Does it mean we have to switch our server to another OS ? Thanks for your opinions! Sources : http://groups.google.com/group/mongodb-user/browse_thread/thread/8131b7e5a5c710d9 http://ivoras.net/blog/tree/2009-11-05.a-short-time-with-mongodb.html

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