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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘VMware Workstation’ Category

Some links that should me help shrinking the virtual disk files of Windows VMs

Posted by jpluimers on 2020/04/03

With virtual disks, at least these three levels are involved:

  • partition or volume (often called drive) size
  • virtual disk size
  • virtual disk backing store size

When talking about shrinking disks, they usually explain about below steps, assuming there is a 1:1:1 mapping of the above and backing store of the disk is dynamically growing:

  1. defragment the files on a partition/volume
  2. zero-fill the non-used space
  3. shrink the virtual disk assuming it is a dynamically growing one

For various reasons, virtualisation environments can have pre-allocated virtual disks ensuring the space on the backing store is firmly reserved.

One such occasion can be in VMware (often required for instance with vSphere/ESXi/ESX based infrastructure, but can also be used in Workstation/Fusion/Player) or Virtual Box in fixed disk mode (default there is dynamic).

Here are some links that should me help shrink in those situations:

More on conversion:

–jeroen

PS: a useful tip by Joe C. Hecht on shrinking:

Oh… On shrinking VM Disks, I make a new growable disk, then use a utility to “smart copy” the partions to the new disk (then replace the disk files in the VM). The “smart copy” just copies the file system – IE what is used (I use an old copy of Paragon Hard Drive Manager). It works out a lot better than writing “zeros”. I then make a compressed image of the whole VM using  rar5 compression with a 1GB dictionary size. I then have batch files that can unrar the VM’s on a moments notice (from a collection of over 300).

Posted in Fusion, Power User, VirtualBox, Virtualization, VMware, VMware ESXi, VMware Workstation | Leave a Comment »

Always use SCSI for your VM guest disks – Jeroen Wiert Pluimers – Google+

Posted by jpluimers on 2020/01/20

Rephrased from [WayBackJeroen Wiert Pluimers – Google+:

If you install a virtual machine, ensure the disk controller and disks are SCSI based.

This has many advantages, including:

  • speed (usually the SCSI drivers can be paravirtualised)
  • hot addition of new disks

It holds for virtually any virtualization platform including all non-ancient (less than ~10 year old) versions of:

  • VMware (Workstation, Viewer, but I expect this also to work on vSphere, ESXI, Fusion)
  • Hyper-V
  • KVM (and therefore Proxmox)
  • VirtualBox

Based on my notes in the above link and the links below:

Note this isn’t just for Linux guests/hosts: Most guests (including Windows) can do a SCSI bus re-scan and detect new SCSI devices.

The trick here is that the guest must already have a virtual SCSI controller (adding that will require a reboot of the guest).

Then adding a new SCSI disk on that controller from any host (Windows, Mac, ESXi, vSphere) should work fine.

–jeroen

Posted in ESXi4, ESXi5, ESXi5.1, ESXi5.5, ESXi6, ESXi6.5, Fusion, Hyper-V, KVM, Power User, Proxmox, View, VirtualBox, Virtualization, VMware, VMware ESXi, VMware Workstation | Leave a Comment »

airbus-seclab/crashos

Posted by jpluimers on 2018/10/30

Cool repository, but contact your cloud provider before trying…: [WayBackairbus-seclab/crashos.

via:

–jeroen

Posted in Fusion, Hyper-V, KVM, Power User, Proxmox, View, VirtualBox, Virtualization, VMware, VMware ESXi, VMware Workstation | Leave a Comment »

Check If A Linux System Is Physical Or Virtual Machine

Posted by jpluimers on 2018/10/08

One day I am going to try to extend this for a few other virtualisation environments and Linux distributions: [WayBack] Check If A Linux System Is Physical Or Virtual Machine

Via: [WayBack] Check If A Linux System Is Physical Or Virtual Machine #Linux – Joe C. Hecht – Google+

–jeroen

Posted in *nix, *nix-tools, Fusion, Hyper-V, KVM, Power User, Proxmox, View, VirtualBox, Virtualization, VMware, VMware ESXi, VMware Workstation | Leave a Comment »

SysInternals sdelete: zero wipe free space is called -z instead of -c

Posted by jpluimers on 2016/09/20

In the 2009 past, sdelete used the -c parameter to zero wipe clean a hard drive and -z would clean it with a random pattern.

That has changed. Somewhere along the lines, -c and -z has swapped meaning which I didn’t notice.

This resulted in many of my virtual machines image backups were a lot larger than they needed to be.

The reason is that now:

  • -c does a clean free space with a random DoD conformant pattern (which does not compress well)
  • -z writes zeros in the free space

Incidently, -c is a lot slower than -z as well.

TL;DR: use this command

sdelete -z C:

Where C: is the drive to zero clean the free space.

–jeroen

Posted in Batch-Files, Development, Fusion, Hyper-V, Power User, Proxmox, Scripting, sdelete, Software Development, SysInternals, View, VirtualBox, Virtualization, VMware, VMware ESXi, VMware Workstation, Windows | Leave a Comment »

 
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