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• In a virtual machine monitor such as VMware's ESXi Server, how are shadow page tables implemented?

  - by ali01

  My understanding is that VMMs such as VMware's ESXi Server maintain shadow page tables to map virtual page addresses of guest operating systems directly to machine (hardware) addresses. I've been told that shadow page tables are then used directly by the processor's paging hardware to allow memory access in the VM to execute without translation overhead. I would like to understand a bit more about how the shadow page table mechanism works in a VMM. Is my high level understanding above correct? What kind of data structures are used in the implementation of shadow page tables? What is the flow of control from the guest operating system all the way to the hardware? How are memory access translations made for a guest operating system before its shadow page table is populated? How is page sharing supported? Short of straight up reading the source code of an open source VMM, what resources can I look into to learn more about hardware virtualization?

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• Don’t Sleep Keeps Your Windows Machine Awake

  - by ETC

  Don’t Sleep is an ultra lightweight and portable application that fills a niche need perfect: sometimes you need to temporarily keep your Windows machine from shutting down or power saving without making any permanent changes to your power profile. Fire up portable Don’t Sleep and tell it how long you want it to stop your computer from shutting down, going to sleep (standby/hibernation), and/or keeping the monitor on. At the end of the monitoring period you can have it turn itself off, stay on but stop blocking, or shut down your computer. It’s a great application for those times you need to alter how your computer handles hibernation mode, activating the screensaver, or other automated tasks without making any permanent changes to your power profile or other settings. Hit up the link below to read more and grab a copy. Don’t Sleep is freeware, Windows only. Don’t Sleep [via The Portable Freeware Collection] Latest Features How-To Geek ETC Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions How to Enable User-Specific Wireless Networks in Windows 7 Access the Options for Your Favorite Extensions Easier in Firefox Don’t Sleep Keeps Your Windows Machine Awake DropSpace Syncs Android Files to Dropbox Field of Poppies Wallpaper The History Of Operating Systems [Infographic] DriveSafe.ly Reads Your Text Messages Aloud

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• Automated “ubuntu-12.04.1-server-amd64” OS installation on physical machine

  - by user285336

  We are using Physical server and are in process of Automated “ubuntu-12.04.1-server-amd64” OS installation on it. There are two HDD for OS installation purpose and there are RAID1 relation between them. This setup has been done through BIOS. The kickstart configuration file looks like this: #Generated by Kickstart Configurator #platform=AMD64 or Intel EM64T #System language lang en_US #Language modules to install langsupport en_US #System keyboard keyboard us #System mouse mouse #System timezone timezone Asia/Dili #Root password rootpw --iscrypted $1$Yl1QJyta$KzIT.kq3i9E5XaiQKcUJn/ #Initial user user ankit --fullname "Ankit" --iscrypted --password $1$c6Yflpea$pi1QQ59/jgywmGwBv25z3/ #Reboot after installation reboot #Use text mode install text #Install OS instead of upgrade install #Use Web installation url --url my_repo_location #System bootloader configuration bootloader --location=mbr #Clear the Master Boot Record zerombr yes #Partition clearing information clearpart --all --initlabel #Disk partitioning information part /boot --fstype ext4 --size 100 --ondisk sda part / --fstype ext4 --size 10000 --ondisk sda part /var --fstype ext4 --size 10000 --ondisk sda part swap --size 1024 --ondisk sdb #System authorization infomation auth --useshadow --enablemd5 #Network information network --bootproto=dhcp --device=eth0 #Firewall configuration firewall --enabled --trust=eth0 --http --ftp --ssh --telnet --smtp #X Window System configuration information xconfig --depth=8 --resolution=640x480 --defaultdesktop=GNOME But I am getting the below error : No root file system is defined Please suggest on this. Do we need to do any modification in kickstart configuration file. Any help in this regard will be very helpful for us. The automated Ubuntu OS installation is successful in Virtual Machine(VM) with the above ks.cfg (kickstart configuration file ) but failing in case of physical machine. Please suggest on this and if possible provide the new ks.cfg file to resolve above problem. Thanks & Regards, Rajesh Prasad

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• Installed on a machine with EFI and after installation, it says the disk is not bootable

  - by Roy Hocknull

  I installed Ubuntu 11.10 and the installation runs through fine. It then says reboot, and the machine says 'inserts a boot disk' which means the hard disk isn't bootable. The primary hard disk is an EFI device, and nothing seems to work. The machine in question is an Acer Aspire M3970 desktop. Core i5 2300, with 8Gb Ram. Main boot drive is an SSD (Vertex 2E 60Gb). I am trying to install the 11.10 x64 version. The installation I have tried from CD and USB stick. It goes through the install, allows you to partition the drives then installs all the packages. At the end it goes for a reboot, and asks you to remove the installation media. The PC then restarts and says no bootable disk. I tried it many times. In the end I have installed Fedora 15 x64 which works straight away with no messing. Unless this issues is fixed I have to drop 11.10 as a viable option. From my experience F15 isn't quite as polished as Ubuntu, but in this case - it works!! Is this a widespread problem or am I unique?

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• VirtualBox : increase hard disk size of the virtual machine

  - by wim

  I have run out of space on my WinXP virtual machine, which I only gave 10 GB space for when I created it. Is there an easy way to increase it to, say, 20 GB? I can't see any obvious option in VirtualBox settings. edit: the suggestion below gives this error wim@wim-ubuntu:/media/data/winxp_vm$ VBoxManage modifyhd wim.vdi --resize 20000 VBoxManage: error: Cannot register the hard disk '/media/data/winxp_vm/wim.vdi' {46284957-2c09-4e70-8a49-bfbe0f7f681d} because a hard disk '/home/wim/VirtualBox VMs/winxp_vm/wim.vdi' with UUID {46284957-2c09-4e70-8a49-bfbe0f7f681d} already exists VBoxManage: error: Details: code NS_ERROR_INVALID_ARG (0x80070057), component VirtualBox, interface IVirtualBox, callee nsISupports Context: "OpenMedium(Bstr(pszFilenameOrUuid).raw(), enmDevType, AccessMode_ReadWrite, fForceNewUuidOnOpen, pMedium.asOutParam())" at line 210 of file VBoxManageDisk.cpp edit2: removing the .vdi from VirtualBox before calling VBoxManage command, then adding it back in, was successful. But now I can't boot the virtual machine, I get this worrying screen: By the way, it says FATAL: Could not read from the boot medium! System halted. edit3: The vdi must be reattached to the VM after VBoxManage command. Further, the partition will need to be resized from WITHIN windows, because you will have this empty space: I was able to resize the partition easily using a bit of freeware called EASEUS Partition Master 9.1.0 Home Edition.

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• Partner Webcast – Oracle Exadata X3 Database In-Memory Machine - Next-Generation Technologies Update - 20 Dec 2012

  - by Thanos

  Oracle’s next-generation database machine, Oracle Exadata X3, combines massive memory and low-cost disks to deliver even faster performance and greater storage capabilities at the lowest cost, making it the ideal database platform for the varied and unpredictable workloads of cloud computing. Oracle Exadata is available in multiple configurations including a low-cost eighth-rack configuration, so you can start small and grow at your own pace. We have also introduced new migration services designed to streamline implementation thereby saving you time and money. If your IT department is expected to deliver business value—or even drive business growth—then you’ll want to join us for a live Webcast discussing how the new Oracle Exadata X3 can help you transform data management.  Agenda: Oracle Exadata Evolution Oracle Exadata X3 Database In-Memory Machine Hardware Update Software Update Exadata Unique Next Generation Technologies Getting on board Oracle Exadata Q&A Delivery Format This FREE online LIVE eSeminar will be delivered over the Web. Registrations received less than 24hours prior to start time may not receive confirmation to attend. Thursday, December 20th, 10am CET (9am GMT) Duration: 1 hour Register Now! For any questions please contact us at [email protected] Visit our ISV Migration Center blog Or Follow us @oracleimc to learn more on Oracle Technologies, upcoming partner webcasts and events. Existing content available YouTube - SlideShare - Oracle Mix.

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• Customers Deploying Sun Oracle Database Machine

  - by kimberly.billings

  Philippine Savings Bank (PS Bank) recently deployed the Sun Oracle Database Machine to underpin its enterprise-wide analytics platform. Now, the response times for queries and requests that used to take from three hours to several days is completed in less than one minute with near real-time updates. Read the press release. EFU General Insurance also announced this week that they have deployed the Sun Oracle Database Machine. With Oracle, EFU will be able to open more sales channels via the Web and facilitate integration with other companies. As a result, more quality services can be offered to its customers via the Web because of the more agile and reliable IT infrastructure. In addition, a centralized IT environment will offer the EFU management a real time view of key information, enabling EFU to analyze business trends and make timely decisions. Read the press release. Let us know about your Sun Oracle Database deployment! var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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• GCC: assembly listing for IA64 without an Itanium machine

  - by KD04

  I need to try the following thing: I would like to compile some simple C code samples and see the assembly listing generated by GCC for IA64 architecture, i.e. I just want to run GCC with the -S switch and see the resultant .s file. I don't have an Itanium machine, so in order to do it myself I'll probably need a cross-compiling version of GCC built for x86 RedHat. I'm not interested in full cross-compilation, meaning that I don't need to generate the binaries at all. The easiest way, of course, would be to find an Itanium machine with with GCC and just try it there. Unfortunately, I don't seem to have access to any. Another option is to build a cross-compiling version GCC on my RedHat, but apparently that's quite an endeavor for someone who hasn't done it before (I assume that the fact that I only need .s output doesn't make it simpler). What other options are there, if any? Maybe there's some sort of a web front to an Itanium GCC compiler on the Net (something like Comeau Online or ideone.com, but with .s output)? Anything else? I would appreciate any help.

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• Dynamic State Machine in Ruby? Do State Machines Have to be Classes?

  - by viatropos

  Question is, are state machines always defined statically (on classes)? Or is there a way for me to have it so each instance of the class with has it's own set of states? I'm checking out Stonepath for implementing a Task Engine. I don't really see the distinction between "states" and "tasks" in there, so I'm thinking I could just map a Task directly to a state. This would allow me to be able to define task-lists (or workflows) dynamically, without having to do things like: aasm_event :evaluate do transitions :to => :in_evaluation, :from => :pending end aasm_event :accept do transitions :to => :accepted, :from => :pending end aasm_event :reject do transitions :to => :rejected, :from => :pending end Instead, a WorkItem (the main workflow/task manager model), would just have many tasks. Then the tasks would work like states, so I could do something like this: aasm_initial_state :initial tasks.each do |task| aasm_state task.name.to_sym end previous_state = nil tasks.each do |tasks| aasm_event task.name.to_sym do transitions :to => "#{task.name}_phase".to_sym, :from => previous_state ? "#{task.name}_phase" : "initial" end previous_state = state end However, I can't do that with the aasm gem because those methods (aasm_state and aasm_event) are class methods, so every instance of the class with that state machine has the same states. I want it so a "WorkItem" or "TaskList" dynmically creates a sequence of states and transitions based on the tasks it has. This would allow me to dynamically define workflows and just have states map to tasks. Are state machines ever used like this?

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• Windows Server 2003 can't see Vista machine

  - by Django Reinhardt

  Hi there, I've got a real PITA problem that I'm sure has a really simple solution. I have a Windows Server 2003 machine that needs to be able to see the network name of a Vista box - but refuses to. It can see the Vista box (and even access its shared folder) if I enter the Vista box's IP address. Problem is: SQL Server refuses to do Replication with anything other than the "actual server name". That means that the 2003 machine needs to be able to connect through the Vista machines network name... not just its IP address. I'm guessing it's a simple incompatibility between OS's, but I'm sure there's got to be a simple way of fixing it. Note: Yes, the Vista machine can connect to 2003 machine, no problem. And other machines in the office can connect to both the Vista machine and 2003 (they have more recent OS's). Thanks for any help!

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• Reboot loop after sysprep of AD machine

  - by rboarman

  Major screw-up here and I need to find out how much trouble I am in. I have an AD machine that is running Server 2008 R2, hyperv, DHCP and DNS. On the hyperv machine, I have a backup AD instance running along with a handfull of other server 2008 instances. Sysprep was run on the hyperv machine instead of one of the instances. I am attempting to bring the machine back up so I can try a system restore. When I boot the hyperv machine, I get an error that says “Windows could not complete the installation. To install windows on this computer , restart the installation” This message occurs in safe mode, AD restore mode and in last known configuration mode. How can I get my OS to boot at this point? Do I need to reinstall 2008 R2 from scratch?

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• Fedora 17 - Can't access remote machine using hostname

  - by Aaron

  I am using Fedora 17 and am trying to access a remote machine (running Fedora 15) using its hostname which isn't working. The machine is right next to me on the same switch as my machine (so they are both on the same network with the same subnet and everything). When I was running Windows (7 32-bit) on my machine I could access the other machine no problem but now that I am running Fedora 17 that's not the case. Is there an additional daemon or something that I need to be using in order for this to work?

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• How to transfer files between a remote Linux machine and a local Windows machine?

  - by Lazer

  I need to transfer files/folders between a remote machine running Linux and my local machine running Windows XP. I usually access the remote machine through ssh, and sometimes use VNC sessions. What is the easiest way to transfer a file from the remote machine to my local machine and vice versa? I think ftp should be the solution. Is there a better way? If ftp is a good option, how do I initiate the transfer? Do I need to setup ftp servers on both the machines and then transfer? What exactly needs to be done?

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• Move samba and ldap config to new machine

  - by Mateusz W

  I'm not advanced administrator so this may be n00b question but I'll be grateful for help. I have following problem: I have to move my server (ubuntu server) from old machine to new. I have samba & ldap on old server, so I've copied the configuration files from the old machine to new machine, made smbldap-populate, and when I use smbldap-userlist on the new machine it lists all users from the old machine. But when I try to log in as any of these users, or show its id (id username) I get no such user error. What more I have to do to use these accounts on the new machnie?

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• Turn my machine in a hotspot/proxy

  - by Leonardo

  My workplace does not provide a wifi... only wired connection... but my machine has a working wifi card... is there a way to "bridge" my wired connection, making my iphone connect to it and use it as if the own machine is being used? (the idea is to make my machine provide a wifi-connection and route it through my wired connection) Details: My machine OS is win 2012 server I have full admin rights to my machine There is a corporate-proxy PS: If more details needed pls ask!

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• VirtualBox cannot start a virtual machine on Windows 7

  - by Zan Lynx

  Note that this question is mostly so others can find this information. I ran into a problem recently with my Fedora-14 virtual machine running on a Windows-7 host with VirtualBox. VirtualBox could not start the Fedora virtual machine, but it could start a Ubuntu virtual server machine that was configured for 512 MB of RAM. The Fedora-14 machine was configured for 2 GB of RAM. The Fedora-14 machine had been working a week ago. What had I recently changed...? Answer to follow.

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• Can't use VHD in a particular machine

  - by madth3

  (All the machines referred below have Windows 7 Professional.) I have a virtual machine targetted for Virtual PC. I'm able to use that disk in two different machines (32 bit and 64 bit, respectively). Yet in the machine where I wanted to finally install this virtual machine I get the error that the VHD file is not valid. The faulty machine is 32 bit and has the exact same Virtual PC version as the other machines. The file was correctly copied (SHA1sum says so). Default XP Mode works (therefore Virtual PC is not so wrong) Does anyone have any idea what might be wrong in the target machine?

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• "Folyamatosan elérheto, üzletileg kritikus adatbázisok" eloadások letölthetok

  - by Fekete Zoltán

  Ferbruár 26-án az IQSYS és az Oracle közösen üzleti reggelit rendezett. "Folyamatosan elérheto, üzletileg kritikus adatbázisok" címmel. A téma bevezeto eloadását Kovács András tartotta. Cseke Attila a Magyar Telekom rendszerei kapcsán a "Nagyméretu, üzletileg kritikus adatbázisok üzemeltetési kihívásai"-ról beszélt. A rendezvényen eloadást tartott Mosolygó Ferenc kollégám, aki az Oracle maximális rendelkezésre állású referencia architektúráját ismertette. Jómagam az "Ideális nagy teljesítményu hibaturo környezet Oracle adatbázisok számára: Database Machine, Exadata" címmel tartottam eloadást. A rendezvény eloadásai letölthetok innen: "Folyamatosan elérheto, üzletileg kritikus adatbázisok".

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• VMWare-Tools Installation fails

  - by Ajay

  I am trying to install VMwareTools-8.4.6-385536.tar.gz (VMWare Tools) on the following operating system: Ubuntu 11.04 Linux ubuntu 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686 i686 i386 GNU/Linux I am using VMPlayer version 3.1.4 - build 385536 After starting the installation I am getting the following errors: What is the directory that contains the init scripts? [/etc/init.d] Error opening No such file or directory Distribution provided drivers for Xorg X server are used. Skipping X configuration because X drivers are not included. Creating a new initrd boot image for the kernel.<br> update-initramfs: Generating /boot/initrd.img-2.6.38-8-generic Starting VMware Tools services in the virtual machine: Switching to guest configuration: done Blocking file system: done Guest operating system daemon: failed Virtual Printing daemon: done Unable to start services for VMware Tools Can somebody help in this?

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• R vs Python for data analysis

  - by The_Cthulhu_Kid

  I have been programming for about a year and I am really interested in data analysis and machine learning. I am taking part in a couple of online courses and am reading a couple of books. Everything I am doing uses either R or Python and I am looking for suggestions on whether or not I should concentrate on one language (and if so which) or carry on with both; do they complement each other? -- I should mention that I use C# in school but am familiar with Python through self-study.

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• Flaws in my PHP development setup - sharing sources causing lags

  - by Wiktor

  I have following development setup for my PHP projects: Working station running on Windows 7 with PhpStorm IDE. GIT for version controlling. CentOS on virtual machine (VirtualBox) with Apache and MySQL (copy of production server). So far, I've been sharing project's source folders between host and guest systems and it was working quite well only really slow. The reason behind this is that Apache was reading files from remote folder (mounted locally). After doing some research, I found out that this set up can be improved by using disk mapping (Samba) instead of folder sharing. So I did that change. I configured my PhpStorm to automatically deploy files to mapped drive. Everything works like a charm now, except for one problem - when I change branches I need to synchronize project's local folder with the one on mapped drive and that takes time, a lot of time (like branching in SVN). Is there another way to handle this than just working on files directly on mapped drive?

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• How do I take an image/backup of Ubuntu partition and restore to VirtualBox VM

  - by whizkid

  I have Ubuntu 10.04 installed on an older hard disk. I recently bought a new disk and already installed Windows 7. I dont want to use the older disk anymore, and I would like to keep on using Ubuntu in a virtual machine on the new disk(to avoid the possible mess-ups of dual boot and I found VirtualBox is the best free tool for this). I wish to keep the exact same data\programs\configurations\settings I had been using in Ubuntu for so long, and avoid the tedious part of having to reconfigure so many things. How do I backup\restore Ubuntu to another disk? I would prefer a free tool to do the backup\restore.

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• How should I design a wizard for generating requirements and documentation

  - by user1777663

  I'm currently working in an industry where extensive documentation is required, but the apps I'm writing are all pretty much cookie cutter at a high level. What I'd like to do is build an app that asks a series of questions regarding business rules and marketing requirements to generate a requirements spec. For example, there might be a question set that asks "Does the user need to enter their age?" and a follow-up question of "What is the minimum age requirement?" If the inputs are "yes" and "18", then this app will generate requirements that look something like this: "The registration form shall include an age selector" "The registration form shall throw an error if the selected age is less than 18" Later on down the line, I'd like to extend this to do additional things like generate test cases and even code, but the idea is the same: generate some output based on rules determined by answering a set of questions. Are there any patterns I could research to better design the architecture of such an application? Is this something that I should be modeling as a finite state machine?

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• Which programming language could I use for Natural Language Processing to extract clinical words?

  - by MACEE

  I am going to do entity extraction (like Named Entity Recognition) from clinical free text (unstructured raw text such as discharge summaries) and these entities could be any medical problem, medical tests or treatments. I am going to use one of i2b2 datasets (https://www.i2b2.org/) if case you are familiar with that. I am new to the NLP(Natural Language Processing) field and I need a programming language to support NLP tasks and also easily connect to the available libraries of machine learning algorithms like CRF. I don't know much java and I heard about Python, Perl and Scala but I am not sure which one would be the best option for this task?

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• Why is Android VM-based? [closed]

  - by adib

  By about 2004, it was clear that ARM is the clear winner for mobile CPUs, beating out MIPS, SH3, and DragonBall. PocketPC (Windows Mobile) applications was natively-compiled (at least most of them - except for .NET compact and its competitors). Likewise, Apple's iOS (named iPhone OS at the time) prefers natively-compiled applications. Then why Android chose a virtual machine based system stack? (the Dalvik VM). Wouldn't it be simpler to just compile applications down to ARM code using GCJ or something? Is the decision influenced by the J2ME-way of doing things, or was just because it's "cool"? Perhaps like most things Java, the culture that prefers multiple levels of indirection and abstractions, they just added another layer of abstraction for "just in case"?

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