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  1.    02 Oct 2014 #1
    Join Date : Jul 2014
    UK
    Posts : 18,303
    Windows 10

    Can setting up a VM cause damage to main system


    Hi,

    It's many years since I looked at setting up a VM so memory is a bit hazy

    If you set one up wrongly can it mess anything up on your PC

    I am assuming the worst that can happen is if you allocate RAM wrongly you main machine will possibly crash but a reboot would fix this

    Thanks
      My ComputerSystem Spec
  2.    02 Oct 2014 #2
    Join Date : Oct 2014
    Posts : 282
    Windows 10!

    I haven't heard anything like that.


    But then again I haven't run a VM for years lol. Don't trust my advice.
      My ComputerSystem Spec
  3.    02 Oct 2014 #3
    Join Date : Sep 2014
    Posts : 4
    Windows 10

    You should be fine, you would have to work very hard to break anything using virtualbox. It is pretty straightforward too.
      My ComputerSystem Spec
  4.    02 Oct 2014 #4
    Join Date : Jan 2014
    Oak Ridge TN, USA
    Posts : 24,523
    Windows 10 Pro x64

    I agree.. I've never had an issue with VMWare.
      My ComputerSystem Spec
  5.    02 Oct 2014 #5
    Join Date : Jul 2014
    UK
    Posts : 18,303
    Windows 10
    Thread Starter

    Thanks for replies, didn't think there was but wanted to check

    Have VMware installed, just need to wait for a time when I can download 10 to install
      My ComputerSystem Spec
  6.    02 Oct 2014 #6
    Join Date : Nov 2013
    Idaho USA
    Posts : 4,826
    OS X, Win 10

    Simply put. . .NO
      My ComputerSystem Spec
  7.    02 Oct 2014 #7
    Join Date : Oct 2013
    Wolves, England
    Posts : 1,634
    W7 Pro x64 | W10 IP x64 | Linux Mint VM

    Yes, under certain circumstances if you're not vigilant. Say your OS resides on a 120GB SSD, and with a handful of other programs on there you have 60GB free. When setting up your VM in VMWare the default installation path is C: so if you create a virtual machine that will ever be allowed to reach that size you would have a problem. It would be easily sorted by simply deleting the VM, but if you have spent time setting it up you won't want to be doing that.

    If you do set it up correctly though, as others have said, it can't affect your main machine.
      My ComputerSystem Spec
  8.    02 Oct 2014 #8
    Join Date : Aug 2014
    Posts : 137
    Windows 10 Home

    I don't quite understand how the VM uses resources. During set up it asks how much Memory to allocate. If my system has 4GB and I allocate 2GB to the VM does that mean my main system will now only have 2GB to work with? Or can I give it everything and it will use what it needs with no effect on the host?

    Someone said I should install the 32-bit version of Win 10 as a VM even though I have a 64-bit system because it will perform better with less memory. So I assumed the above reason was why.
      My ComputerSystem Spec
  9.    02 Oct 2014 #9
    Join Date : Oct 2013
    N Calif
    Posts : 694
    W10 Pro (desktop), W10 (laptop), W10 (laptop), W10Pro (tablet)

    You have it right. If you allocate 2GB to the VM, then you'll have that much less RAM for your main system. It's best on a system with only 4GB of RAM to stick with 32-bit for guest OSes.
      My ComputerSystem Spec
  10.    02 Oct 2014 #10
    Join Date : Oct 2013
    A Finnish expat in Germany
    Posts : 12,662
    Windows 10 Pro

    Quote Originally Posted by bru View Post
    I don't quite understand how the VM uses resources. During set up it asks how much Memory to allocate. If my system has 4GB and I allocate 2GB to the VM does that mean my main system will now only have 2GB to work with? Or can I give it everything and it will use what it needs with no effect on the host?

    Someone said I should install the 32-bit version of Win 10 as a VM even though I have a 64-bit system because it will perform better with less memory. So I assumed the above reason was why.
    The RAM assigned to vm is taken from the total amount of RAM available on your host. As the host still needs some of it to run, you cannot assign all of your host RAM to a vm. In your case you can assign a maximum of 2.5 to 2.8 GB to a vm out of 4 GB total, depending on the virtualization program you are using.

    Some virtualization programs allow using so called Dynamic RAM. When Dynamic RAM is selected, the vm uses at any given moment only as much RAM as it needs though at least a set minimum, and never more than the set maximum. This example from Hyper-V virtualization, my Windows 10 Tech Preview vm:

    Click image for larger version. 

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    Dynamic RAM enabled (yellow highlight), the VM starts with 1024 MB (#1) and is allowed to decrease and increase the amount of RAM it uses as it sees fit, though always using a minimum of 512 MB and never exceeding 4096 MB (#2).

    Kari
      My ComputerSystem Spec

 
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