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• syntax for calling virtual functions outside of the class?

  - by sil3nt

  Hi there, what is the syntax for defining virtual functions outside the class body? class random{ public: random(int i = 0); virtual ~random(){}; virtual void print() const; protected: int id; }; is it? virutal void random::print() { } ?

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• How to make a DHCP server on virtual machine serves other virtual machines(on different physical machines)?

  - by Tony

  I'm building a virtual cluster with VirtualBox and Opensuse. I have 10 physical machines and need several vms on each. The virtual machines are supposed to be in a "private" network, but still have internet access. I was asked to set up a virtual head node working as DHCP server. I installed DHCP server on the virtual head node and it seems works. On VirtualBox I set 2 network adapters to the head node, one bridged adapter and one internal network. One vm on the same physical machine has been set nic as internal network adapter. The vm can get IP address (so DHCP works) but can't access internet. What should I do? Specifically, what network adapter should I choose for head-node and work-nodes in VirtualBox? What in the virtual machines should I do?

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• Windows 2000 under Windows 7 Virtual PC not working correctly

  - by dave

  I have just moved my Windows 2000 Virtual PCs from Vista to Windows 7 Professional (64-bit). The machines work to a point but I have found some problems: drive mapping does not seem to work any more. I need this to exchange data. I do not need network access to the virtual PC so would rather leave it unconnected. the virtual PC would automatically shutdown the session and go to the login screen after a few minutes of inactivity. I tried installing the Virtual PC Integration Components but the install failed (one of the messages basically says it's XP+ only). Now I'm stuck in 640x480 mode with mouse capture. I have heard that you can install an older version of the Integration Components but this sounds a bit suspect. Does anyone have any ideas on how to get Windows2000 working with drive sharing on a Virtual PC?

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• sizes of RAM, of virtual memory and of swap for 32-bit OS

  - by Tim

  If I understand correctly, a 32-bit OS (Ubuntu) can only address 4GiB memory, so RAM with size larger than 4Gib will only be used 4Gib of itself and the rest is a waste. I am now confused about this situation for RAM with similar one for virtual memory and for swap. with virtual memory being swap + RAM, if the size of the virtual memory exceeds 4Gib, will the exceeding part be a waste for the 32-bit OS? if I now have to choose the size for my swap partition, is it a factor to consider that the 32-bit OS can only address 4GiB memory? Does the size of swap have to be chosen with respect to the 4Gib addressible limitation? Will the swap exceeding 4GiB always be a waste? is virtual memory equal to RAM and swap? or can virtual memory use space on the hard drive outside the swap partition? Thanks and regards!

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• Repairing hard disk when Windows installation disk won't boot

  - by Echows

  I'm trying to recover some data from a faulty hard disk with Windows installed on it (on which Windows won't even boot). I have tried so far: Booting to Ubuntu live USB stick and running ntfsfix (didn't work) Trying to mount the broken partition when running Ubuntu from usb stick (doesn't mount) Running photorec image recovery tool from live Ubuntu (it found some stuff but not the images I was looking for) Now as a last resort I got myself a Windows installation on a USB stick so that I can try fdisk, but the installer doesn't work. The loading screen shows up and then the installer crashes. The installer works fine on other computers. I suspect that the installer is trying to read the hard drive to see if there's something there but when it can't read one partition, it crashes. On Ubuntu, I can mount other partitions except the one I'm interested in so at least the hard drive is not completely dead. So the question is, what options do I have left? To be more specific, my goal is to recover some images from the faulty ntfs-partition on the hard drive. Other than that, I don't care about the contents of the hard disk.

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• Virtual Machines and Automatic Software Updates

  - by Zian Choy

  It's obvious that one's main computer should always be have all the latest security patches and most people don't blink an eye when Microsoft Update installs non-security updates. In the land of virtual machines, I've run into 2 problems with automatic updates: The virtual machines are only run when needed. Only Windows virtual machines seem to patch themselves. To elaborate on #1, I generally make a virtual machine with a purpose in mind. For example, when I needed an old copy of Internet Explorer to reproduce a bug in RSS Bandit, I had a Virtual PC named RSS Bandit. The machine only stayed running for a few minutes at a time. Consequently, there is no downtime for the machine to download updates at 3 AM. To elaborate on #2, I've noticed that if I haven't run a Windows virtual machine in a while, then the moment I log in, the computer frantically downloads updates and within seconds, if I click the Start button, there is a little orange shield next to the "Shutdown" button. However, I ran a freshly created Ubuntu VM for several hours today with hundreds of updates pending and it seemed to never download any of them or install any of them. Is there any reason to be concerned about running VMs with dozens of security holes? If I should be concerned, then is there any way to get Ubuntu to download and install updates rather than just advertising a long list of updates to download next century? I've already tried telling Ubuntu to automatically download and install updates.

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• Accessing clearcase view drive from virtual machine is slow

  - by PermanentGuest

  I have a windows XP virtual machine running under a Windows XP host. On the host : On the host clearcase 7.1.1.2 is installed. I have a dynamic view mapped onto some drive. The view has certain VOB/directory structure where my application DLLs from the nightly build and config files are stored. I run my application on the host machine which uses the DLLs and config files from the VOB and everything runs smooth. Now I want to move this set-up to a virtual machine. On the guest : I'm running the guest with a vm-player. I don't want to install clear-case on this as I don't want to expose this machine onto the network. The network setting in the guest is 'host-only'. I have mapped the host's clearcase view drive as a shared folder and I'm able to access this drive from the virtual machine. Also, the application is running. However, the problem is that the access of the clearcase drive from the virtual machine is very slow. I can experience this from the windows explorer. Due to this, the starting of my application takes several seconds in the virtual machine while on the guest it comes up pretty fast. My question is : Is there any way to speed up the performance? I have managed to copy some of the DLLs which don't change frequently to the virtual machine to improve the performance. However, there are still lot of DLLs which have to be taken from the clearcase drive as they change frequently. VMplayer version is : VM Player 3.0.1 build-227600 Both guest and host is : Windows XP service pack 3 Host clearcase is : clearcase 7.1.1.2

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• Can't remote into Virtual PC

  - by Spamela

  I used to be able to remote into my Virtual PCs. It has been working for at least a year. Yesterday just stopped working... I cannot figure it out... Things I have triple-checked: 1. My Virtual PCs have "Allow Remote Access" checked. 2. My Virtual PCs have an account in the Administrator group that is password protected. 3. My Host's entry in the registry for the Terminal Services Port is still the default of 3389. So here is the strange thing. I can't even remote into the Virtual PC from it's host much less another PC... From the host, I can ping the Virtual PC and get a response but when trying to remote into it from the host I get the following error: Remote Desktop can't connect to the remote computer for one of these reasons: 1)Remote access to the server is not enabled. 2)The remote computer is turned off 3)The remote computer is not available on the network My host is running Windows 7. Virtual PCs are running XP. Thank you for looking at this!

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• Simple VM That allows booting from folder or disk

  - by None

  I was wondering if there was a very simple and free virtual machine that would allow you to boot from a folder or disk image that couldn't damage my hard disk. I am using a MacBook and am looking into operating system programming. I found a tutorial on the internet that looked promising (http://www.viralpatel.net/taj/tutorial/hello_world_bootloader.php). I want to try this but using a VM instead of actually booting from a disk. If I made a folder or disk image containing the boot.bin file and wanted to try the OS I made (while booting from a folder or disk image, not a disk), is there a VM that would let me do it? I have no previous experience with virtual machines. I also want to be sure my hard disk would not be damaged.

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• How to add NT Virtual Machine\Virtual Machines to GPO

  - by Nicola Cassolato

  I have a Windows 2012 Server with Hyper-V enabled and a few virtual machines. My current configuration has a few account in the "Log on as a service" list in the domain policies, and sometimes this prevent my virtual machines from starting (I get this error: 'Error 0x80070569 ('VM_NAME' failed to start worker process: Logon Failure: The user has not been granted the requested logon type at this computer.') As described in this KB I would like to add NT Virtual Machine\Virtual Machines to my "Log on as a service" list to resolve my problem. My problem is that when I try to add that user to my domain policy I get an error message: "The following account could not be validated". My domain controller obviously doesn't know about that user since it's not an Hyper-V enabled server. How can I add that account to my Domain Policies?

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• Apache disabled virtual host domains resolve an enabled virtual host

  - by littleK

  I have three virtual hosts defined on apache on my Ubuntu server for three different domains. If I disable two of the virtual hosts (a2dissite) and try to resolve those two URL's in the browser, then the one remaining enabled site will resolve. How can I configure apache so that the domains for the disabled virtual hosts do not resolve? This is how all 3 virtual hosts are configured (info is masked): # domain: myfirstdomain.com # public: /home/me/public/myfirstdomain.com/ <VirtualHost *:80> # Admin email, Server Name (domain name), and any aliases ServerAdmin [email protected] ServerName www.myfirstdomain.com ServerAlias myfirstdomain.com # Index file and Document Root (where the public files are located) DirectoryIndex index.html index.php DocumentRoot /home/me/public/myfirstdomain.com/public # Log file locations LogLevel warn ErrorLog /home/me/public/myfirstdomain.com/log/error.log CustomLog /home/me/public/myfirstdomain.com/log/access.log combined </VirtualHost>

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• Virtual Hard Disk Migration from Virtual Server 2005 to Hyper-V

  - by Akash Kava

  I have two questions, Can I use existing 2nd Hard Drive as External Hard Drive inside Virtual Server Instance running on same machine? If I use right now Virtual Server 2005 and run my server, tomorrow if I buy HyperV on different machine, can I just simply use same Virtual Hard Drive in Hyper V Without having to reinstall everything?

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• What are the Best Virtual Desktop Managers for Windows 7 excluding Dexpot? [closed]

  - by user233641

  My question is different to others as my list of important features is completely different and I believe unique. Necessary Features Are: Dual-monitor support 6 desktops minimum Different icons can be created on different desktops Reliable and does not delete or remove icons without input from me Ability to save profiles and reload them if necessary Ability to change the home desktop to a different one Reasonably easy to use Keyboard Support Good email support

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• Server 2008 Disk Management Hangs

  - by Payson Welch

  So I have looked everywhere for the solution to this and have tried many things. There is one post on SE related to this and I tried the suggested answer but I am still having problems. We have a server running Server 2008 R2 Standard x64. I need to increase the space of C: since the free space is running very low. However when I open Server Manager and try to go to the "Disk Management" snap-in it just hangs. There is a status message on the bottom of the window that says "Connecting to Virtual Disk Service...". Here are the steps I have taken: Ran sfc /scannow Set all of the drives to be dirty and rebooted so that they would be scanned Executed chkdsk /f /r /b /v on all of the drives. Checked for Windows updates (none). Verified that the services "Virtual Disk", "RPC Procedures" and "Plug and Play" are all running. One symptom is that the service "Virtual Disk" does not cleanly shut down. I receive a message about the process being unexpectedly terminated when I try to stop or restart it. Also I cannot find anything relevant in the event logs. Any ideas or suggestions?

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• My system is always disk-bound (the disk light is always on). Why is this?

  - by Scoobie

  I have been given a laptop by the good folks at my company on which to do my work (Java development). I usually use eclipse as my primary development platform. The laptop is a Dell D830 and runs Windows 7 - 32 bit. Although the processor supports a 64 bit instruction-set, licensing limits me to running the 32 bit OS. The HDD is a WD1600BEVT (Western Digital). I have noticed that my disk is always very slow. Windows start up is usually pretty quick, however as soon as I log on, my disk light stays on and usually, the laptop takes about 4 minutes (after logging in -- immediately upon getting the prompt to press Ctrl + Alt + Del to log in) before it's usable. Questions: Is this expected behavior? What can I do to examine the disk and determine the cause of the problem? What can I do to improve my disk's performance? Any optimizations you may be able to suggest? Other Questions: Some have suggested running Process Monitor (from sysinternals), but how would i get the log since start up? Instead of trying to fix this myself, should I simply push this onto the system administrator? Thanks all.

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• Forms authentication ignored in virtual application

  - by Christo Fur

  I have an admin site swet up as a virtual applcation inside of another website. I would like visitors to the sub directory (the virtual application) to be promtped for credentials using the same Forms autheentication set up on the main parent site Have tried all sorts of things but can't get it to work including Removing all ,, and sections from the virtual-app web.config Copying the same ,, and sections from the parent to the virtual-app web.config Using a virtual directory instead of virtual application But I never get promted for credentials Anyone know how to get this setup? thanks

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• Win32 API P-Invoke to bring a disk online, offline, and set unique ID

  - by Andy Schneider

  I am currently using Diskpart to accomplish these functions, but i would like to be able to use P-Invoke and not have to shell out to an external process in my C# app. The example Diskpart scripts are: //Online a disk Select disk 7 disk online // Reset GPT Identifier select disk 7 UNIQUEID DISK ID=baf784e7-6bbd-4cfb-aaac-e86c96e166ee I tried searching pinvoke.net but could only find functions that dealt with volumes, not disks. Any idea on how to accomplish these diskpart commands using Pinvoke?

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• The 35 Best Tips and Tricks for Maintaining Your Windows PC

  - by Lori Kaufman

  When working (or playing) on your computer, you probably don’t think much about how you are going to clean up your files, backup your data, keep your system virus free, etc. However, these are tasks that need attention. We’ve published useful article about different aspects of maintaining your computer. Below is a list our most useful articles about maintaining your computer, operating system, software, and data. HTG Explains: Learn How Websites Are Tracking You Online Here’s How to Download Windows 8 Release Preview Right Now HTG Explains: Why Linux Doesn’t Need Defragmenting

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• KVM online disk resize?

  - by Eil

  We're evaluting KVM for Linux virtualization on a few projects. All is going well so far. But one of our requirements is the ability to add disk space to a running guest without rebooting or taking it offline. Is this possible with KVM? The only thing I've found so far (but have not tested yet) is the ability to hotplug disks into the machine. If I go this route, then I could always add the new disk to an LVM volume group on the guest and then extend the chosen logical volume. The biggest downside to this approach is that over time we might end up with guests having variable numbers of virtual disks. The "real" disk space would be provided to the host over a SAN, so we can always add more space to the host whenever.

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• Fix bad blocks on Mac hard disk

  - by Andrew Vit

  I have a hard disk that I scanned with TechTool and it reports one bad block. As far as I can tell, TechTool only scans and reports a failure. It doesn't fix anything. Back in the day, Norton Disk Doctor did the job of scanning and flagging (remapping) bad blocks on the Mac. Today we have various tools for fixing up HFS+ directory errors (Disk Utility, fsck, DiskWarrior, TechTool), but I don't know of any tool that will do a surface scan and fix the bad blocks too. What software is available for this? If I know the address of the bad block, is there a low-level terminal utility for marking it?

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• Truecrypt or default Disk Utility on Mac?

  - by Kaushik Gopal

  Windows by default doesn't come with a password protect folder option (other that Win7 ultimate), so I used to swear by Truecrypt which was great. But I've read in a couple of places that Mac OS X by default has a way of protecting folders using the Default Disk Utility. So my question is which is better, using TrueCrypt on the Mac or just sticking with the default Disk Utils app? Can somebody let me know the advantages of one over the other? A summary from the very helpful answers below: if you're looking for cross-platform usage Truecrypt is the obvious tool of choice if you're looking for convenience, and intend to stick only to the Mac platform, use the default Disk Utils app.

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• Program complains not enough disk space even if the disk space exists

  - by user1189899

  I have an EXT3 partition mounted in ordered data mode. If a power failure occurs when a program is creating files on that partition, I see that space usage reported is normal and I don't see any partial written files. But when I try to run the same program again after the system comes back up it complains that there is not enough disk space. Even though the free space reported is far more than required. The program always succeeds in normal conditions. Also the problem seems to disappear when the partition is remounted. I was wondering what could be the right way to handle the situation other than unmounting and remounting.

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• Disk Response Time in Windows 7 Resource Monitor?

  - by Keith Nicholas

  In the resource monitor I'am looking at the disk response time. There are a lot of processes where the response time is thousands of milliseconds consistently, I'm pretty sure this is the source of my computer slowing down. I'm not sure what normal response times are though? I'm running win 7 64bit ultimate. This is running on a new computer, i5 with a terabyte drive, 4gigs of ram, etc, disk is still pretty much empty, so it should all be pretty snappy. And if it is going really slow, how do I track down whats causing it? I've turned off things like real time virus protection as experiments to see if there is something weird there, but makes no real difference (other than it doesn't contribute to the problem by accessing the disk)

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• Scan disk runs on every boot with Windows XP

  - by Sarfraz Ahmed

  I have four drives on my computer. The problem is that each time I start the computer the scan disk check (CHKDSK) runs for a drive even if I shut down my computer properly. I ran the thorough scan disk check but still for that drive, the scan disk check is always performed no matter what. I wonder what is wrong although everything is fine and accessible along with drive data. Could you guys please help me out of this? I am using Windows XP SP2. Thanks.

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• FTP Reporting Disk Quota Exceeded

  - by Austin

  I am using Notepad++ with FTP_Synchronize to upload files to a server, however, it appears that it is not allowing my file to upload because apparently the "Disk Quota Exceeded" 11:18:49 > -> TYPE I 11:18:49 > Response (200): Type set to I 11:18:49 > -> PASV 11:18:49 > Response (227): Entering Passive Mode (*,*,*,*,*,*). 11:18:50 > -> STOR /home/*/../../var/www/html/test.html 11:18:50 > Response (150): Opening BINARY mode data connection for /home/*/../../var/www/html/test.html 11:18:50 > Response (552): Transfer aborted. Disk quota exceeded Now it may appear that yeah my Disk quota is exceeded, however I've gone to the back-end and saw: Total Used Bandwidth 107.055 MB Allowed Quota 3,000.0 MB Note: Stars were put in place for irrelevant data.

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