Demystifying the Atlantis ILIO replication host – part 1

Written by Ingmar Verheij on April 28th, 2013. Posted in Atlantis ILIO, Demystified

When Atlantis Computing added persistent support for their ILIO Diskless VDI in Q1 2013 I couldn’t wait to get my hands on a copy. Last week I was able to deploy an Atlantis ILIO environment with a Replication Host.
Atlantis ILIO Persistent VDI 4.0

In the first part of this article I will explain what the replication host is, how it’s used and how it works. In the second part I’ll dive into the boot process and how the hosts are managed.

Site optimization for bloggers

Written by Ingmar Verheij on March 8th, 2013. Posted in Opinion article, Other

I’ve been writing articles on weblogs since 5 years and figured it would be time to investigate some time in JetPack statisticshow optimizing my site. I focused on the following topics:

  • Content
  • Visibility on search providers (SEO)
  • Author visibility
  • Informing your readers
  • Cross posting

After a weekend of reading articles, installing and configuring plugins and some tweaking the weekly visitors increased by 30% Glimlach 

WP – Automatic smushing has been disabled temporarily due to an error

Written by Ingmar Verheij on March 1st, 2013. Posted in Other

Yahoo! YSlow Smush.itThe performance (loading speed and bytes sent) of a website can be optimized using Yahoo’s API “” by optimizing images in several losless ways:

  • stripping meta data from JPEGs
  • optimizing JPEG compression
  • converting certain GIFs to indexed PNGs
  • stripping the un-used colours from indexed images

The WordPress plugin “WP” does an awesome job by automating this process and offering a bulk action to smush all images. Unfortunately the Yahoo service isn’t very reliable nor fast, and that’s an understatement.

A lot of users are experiencing delays causing the plugin to be disabled. The following error is thrown:

Automatic smushing has been disabled temporarily due to an error. Operation timed out after 20000 milliseconds with 0 bytes received

How to disable the DHCP server on an Apple Airport

Written by Ingmar Verheij on January 2nd, 2013. Posted in No category

The Apple Airport (extreme) is “in my humble opinion” a very good access point for home and small office use. As with other Apple products it’s really a dummy-proof products that’s easy to setup and use. But for the more adventurous user the it might feel as if you’re force to do what Apple tells you to do (sounds familiar?).

For instance disabling the DHCP server is not an option if you’re sharing a public IP (better known as network address translation – NAT). If you want to run your own DHCP server (where you can configure stuff like DHCP options) you have two options.

(Non)paged memory pool limit, it might be smaller then you expect

Written by Ingmar Verheij on October 12th, 2012. Posted in Other

A Windows operating systems divides memory in two spaces: user-mode and kernel-mode. By default 2GB is assigned to kernel mode (1GB if the /3GB switch is used, which is not the case). The user-mode memory is for regular application usage, the kernel-mode memory is for “special” purposes.

Part of the kernel memory are two pools:

  • Non-paged memory pool: Objects in this pool are never paged
  • Paged memory pool: Objects in this pool can be paged

The size of these pools is limited and could become critical. Especially in a multi-user environment like, remote desktop shared service (RDSH), with an x86 processor architecture the paged memory pool limit can be reached sooner than you might expect.