I've a Windows 7 VM, with a 100 GB virtual drive size. Initially, this VDD spent 40 GB on the host storage. Once it's zeroized, the VDD eats for real 100 GB on the host. And qemu-img -c ... creates a 91 GB, which is not at all what I expected.
Thanks to @dyasny, I made a small test with virt-sparsity. I cleaned up the W7 VM disk, disable hibernation, so the VDD only consumes 20 GB. Degraded the disk again, and ran again sdelete -z. Running virt-sparsity with the --compress flag gives a 80 GB virtual drive. Far from what I would have hoped.
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EDIT-2016-02-16:"Refreshing" this question because the method to shrink a VM discussed here is very efficient but has a major drawback: it deletes all VM snapshots. If someone knows how to shrink a VM while preserving snapshots, feel free to share!
To shrink a Windows Guest OS, you have to shrink the partition inside the guest, shutdown the VM, create a new smaller disk of the desired size, copy the data from the old disk to the new smaller disk, swap the disk names and reboot the VM.
In this step, we'll just reduce our windows partitions directly from Windows. The resulting disk image at the end of this step will be the sum of the boot partition, the C: drive (reduced) and a leftover unused space that we will delete (by not copying it over to a new disk).
The procedure is not really a shrinkage, but instead we're going to create a new disk (of the final size) in which we will copy the two partitions from the original disk, and skip carrying over the unused space.
The goal is to create a disk whose total size = boot partition + C: partition. We'll also end up with some tiny leftover space (unless your math was perfect) not to worry about because we'll deal with in the last step.
Notice that we have /dev/sda1 which is our windows boot partition of 350 MB, /dev/sda2 which is our C: partition of now 34 GB and that the total disk image /dev/sda/ is of 100 G leaving us with a bunch of space to trim.
Notice the tool found the surplus of space... recall the comments about Math... So you can cancel that and recreate the disk or just move on as we do here and expand the sda2 partition as is done on STEP 3.
I finally managed to really shrink the VM space. At the beginning, the W7 VM ate 107 GB on the host storage. The virtual HDD size is 100 GB and currently, the VM only eats 18 GB of its virtual storage.
When you run qemu-img -c, you compress the image, which, while being able to reduce some space, can really hurt performance. If you want to deduplicate the zeroes on the disk, you need to run qemu-img convert, basically as if you're trying to convert the image from one format to another (even if the src and dst formats are the same).
You just need to "hole punch" or "sparsify" the empty space. To do that, you need the space to contain only 0's and holes. A filesystem's "empty space" is just unallocated, but may contain old junk data, not 0's. So the first step is to zero it. There are tools to do that, but here's an easy minimal way to do it...
Punch holes. There are a few ways to do this... here is a fast way, using a python script. First stop the vm, then run the script on the disk file(s). If it's a qcow2 file or another format, it should work the same, but there might be something I am forgetting, or simply an easier way.
And be aware that a hole is not allocated, so the file is not all in one place; the filesystem may become fragmented, hurting performance. This should not be in any way noticable on typical Linux/UNIX filesystems unless you were very low on space while writing files, but just be aware of the possibility. It is recommended to keep at least 10% free space to avoid fragmentation.
Also, there are tools that do other things too... like zeroing only the non-zero empty space (so they don't grow before you punch holes), zeroing swap too, doing it while online (probably requires hypervisor support), etc.. I tried these ways and found they all were terribly unreliable, sometimes barely shrinking 5% as much as manually zeroing it does, so I won't even bother listing the tools; others can list their favorites.
You may want to disable System Restore or delete any existing volume shadow copies in the VM disk. That alone can take up lots of space, and will appear hidden to the filesystem. Then run sdelete and zero out the free space, after a vm reboot.
My question:
I am missing the Restore button (the button between minimize and Close).
I already have updated, uninstalled and installed again. Non have solved the problem.
Currently I am on the latest versoin: 10.11.1
Each time I open Postman, the Postman Window is Maximized an covering all the beyond windows. I cannot move it to another screen, I cannot resize it and as shown in the picture, I do not have the Restore size button.
If I have Emacs split horizontally and on top I'm editing elisp code and on the bottom I am in the shell. By default, Emacs makes the two windows equal in size, but I'd like the shell buffer smaller. I was wondering how I could do that.
Note that this seems to sometimes depend a bit on the actual xterm or xterm-like program, and iirc in older Emacsen it wasn't reliable past about the 100th column unless you played with the TERM environment variable a bit, but in my Emacs 24.2.1 it works fine with emacs -nw -q (ie. totally ignoring my .emacs and manually enabling xterm-mouse-mode with M-x xterm-mouse-mode)
You can reduce the size of a video in Windows by using the Windows built-in video editing app. This app is known as Video Editor. How to reduce the size of a video in Windows are being pinpointed below:
You can reduce the resolution of a video in Windows 10 by using a free video resolution converter. This tool is called the Freemake video converter tool and it is being used to lower the resolution of a video. You can achieve a reduction in the resolution of a video by:
The size of an MP4 video can be reduced by the use of a software compressor and converter tool known as the EaseUS converter. It allows you to effortlessly reduce the size of an MP4 video without any hassle. You have the ability to set the quality and format of the video file output you desire and then get the result in record time.
Nowadays, video compression is a greatly adopted act of compressing or reducing the file or data size of an original video without compromising its initial visual quality. However, the fact that most video creators create a series of video content for the benefit of their viewers makes video compression be performed on a regular basis.
As a computer user with a Windows 10 or 11 running on your PC and trying to figure out how to compress video windows of a large video content file to reduce the space occupied by the original video, you are in the right place to figure that out!
Windows Media Player is the default media player in all Windows operating systems (OS). Whenever you intend to open a video on your computer, the Windows Media Player is set to open up your video instantly being the default media player.
Moreover, Windows Media Player is one of the windows compress video tools that enable a user like you to perform a variety of functions which include the compression of videos to reduce their file or data size.
Step 2. Click on Now Playing and choose the specific video you want to compress from your PC. After that, hold down your mouse button on that video and drag it into the Windows Media Player area then drop the mouse button.
VLC Media Player is more than a media player software application. It allows you to also compress video windows without compromising on the visual quality of the original video. This method applies to Windows 10 and 11-based computers.
Step 3. Click the profile drop-down menu to enable you to compress your video file. Ensure you select the profile that correlates with the device the video will be played on, then choose a destination and click Start located at the bottom.
Apart from the standard photo editing features the Photos app has, it also enables a swift video file size reduction in Windows 10 or 11 without any noticeable sacrifice in the quality of the originally made video.
Step 3. Click the Finish Video button and select either small, medium, or large output video file size before you even commence the video exporting. Then, your video is readily reduced in file or data size.
Just like any other windows compress video tool, the VSDC Video Converter is also a great video file size reduction tool that is available for free use. This video-compressing software application works on all Windows operating systems including Windows 10 and 11.
Media.io is online windows compress video tool for turning heavy video files into compressed files without any loss in video visual quality. Media.io also performs other numerous video editing tasks which makes it an all-in-one online video software. Follow the steps below on how to compress a video file on Windows 10/11 online using Media.io.
Without mincing words, having known the various ways how to compress a video in windows 10, you will agree with me that all these steps are quite easy to follow regardless of the compressor or converting software you decide to use. 152ee80cbc
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