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

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Archive for the ‘View’ Category

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 »

VMware View Client uses PCoIP; please network admins read the PCoIP checklist!

Posted by jpluimers on 2012/02/24

Somehow, I have the impression that not all VMware View Client network admins fully read and understand the “PCoIP Protocol Virtual Desktop Network Design Checklist

That checklist is important, as it is easy to get things wrong and dissatisfy your users without reason (heck, they get worse than mediocre RDP performance experience, so you could’ve saved you the work of PCoIP in the first place).

So please do read the “PCoIP Protocol Virtual Desktop Network Design Checklist“.

It starts with

The PCoIP protocol provides a real-time delivery of a rich user desktop experience in virtual desktop and remote workstation environments.

To ensure a responsive desktop, the PCoIP protocol must be deployed across a properly architected virtual desktop network infrastructure that meets bandwidth, QoS, latency, jitter, and packet loss requirements.

CheckPoint VPN sometimes can be a dork combined with PCoIP. and at least make sure UDP works well over your VPN.

–jeroen

via: “PCoIP Protocol Virtual Desktop Network Design Checklist

(Some more backgorund reading and even more)

(fixed typo: one of the PCoIP occurances was PCiOP, luckily, Google knows better :)

Posted in Power User, View, VMware | 2 Comments »

 
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