large difference between c-drive and vm size

Discussion in 'Installation and Configuration' started by ChrisTom, Nov 14, 2017.

  1. ChrisTom

    ChrisTom Bit Poster

    Messages:
    6
    I run a number of different Windows 10 VMs with expanding disks, and the bloat (difference between the c-drive and v-hdd size) varies quite a lot. Here are two examples (No snapshots):
    Low bloat: c-drive 19.5GB, Total size in Config/General: 20.9GB, PVM: 22.4GB
    High bloat: c-drive 19.3GB, Total size in Config/General: 24.1GB, PVM: 25.87GB

    As I run quite a lot of VM for different users and clone them for new installations, any bloat makes backups and limited SSD space is a real pain. I have tried to compress and optimise everything I can think of, in Windows 10, and in Parallels Desktop, with Reclaim and the extra 3GB of bloat is really annoying me in some of these.

    Please can someone tell me what it is and how I can manage it down?
    Most of the VMs are run in PD11, but I tested a high bloat one in PD13, and also found I could not reduce it.
    Thanks
     
  2. alexg

    alexg Parallels Developers

    Messages:
    458
    PVM size is the summ of various VM files. It contains HDD (c-drive as usual), snapshots (if any), suspend state (RAM, devices state).

    If you do not have snapshots, VM is not in suspended state then PVM size should be similar (not equal) to c-drive.
     
  3. ChrisTom

    ChrisTom Bit Poster

    Messages:
    6
    Yes. This is what I would expect. But it is not what is happening. Here is one I have moved over to a PD13 environment.
     

    Attached Files:

  4. alexg

    alexg Parallels Developers

    Messages:
    458
    I see. It seems there is unused space inside virtual HDD what occupy disk space in Mac. Lets try to do the following:

    1) Open Windows 10 VM and run it
    2) From File menu in PD choose Check Disk
    3) Then operation completes click on HDD icon in the VM window title bar and select Reclaim Disk Space...

    Let me know the results.
     
  5. ChrisTom

    ChrisTom Bit Poster

    Messages:
    6
    Hi, I had already done all this, but did it again. And then W10 update 1709 landed and I had to start again, having done the disk clean-up.

    But the result was no benefit other than 100mb.
     
  6. JosephL6

    JosephL6 Bit Poster

    Messages:
    12
    I would definitely appreciate some guidance in this area. My pvm started at about 80GB when I first installed it, and is now at 206GB. The C-drive is only 60GB. This is on a MacBook Pro with 512GB - it's getting crowded. How can I determine what is taking up so much space, and whether I can reduce the space somehow. I do have snapshots enabled, and the disk save in configuration is set at 256 GB.
     
  7. alexg

    alexg Parallels Developers

    Messages:
    458
    This is why. How many snapshots you have in Snapshot Manager? Or do you have Smart Guard enabled?
     
  8. JosephL6

    JosephL6 Bit Poster

    Messages:
    12
    Yes, I. Do have SmartGuard enabled.
     
  9. alexg

    alexg Parallels Developers

    Messages:
    458
    JosephL6, this is the answer to your question. SmartGuard uses place to store the data. It depends on data you have stored on the disk between the SmartGuard sessions.
     
  10. JosephL6

    JosephL6 Bit Poster

    Messages:
    12
    I thought I would test your theory by deleting one of the snapshots. What happened is even stranger. After I deleted the snapshot, the pvm in control center decreased by 15GB, but the space taken up on my HDD INCREASED by about 30GB. I have used the Parallel "clean drive" utility, and there are no large files visible to me, suggesting it is a Parallels file. I am going to run out of space son. Do you have any idea to clearly determine what files are taking up so much space?
     
  11. alexg

    alexg Parallels Developers

    Messages:
    458
    JosephL6, let me explain how SmartGuard and Snaphots work. SmartGuard do snapshots on schedule by settings you set in its parameters. Thus SpartGuard just a set of snapshots. The more snapshots the more disk spaces occupies by it. You can turn off SmartGuard and get the real disk size of your virtual machine.
     

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