we have released the howto v 0.5 of VDD documentation, with two new  sections "documentation > how tos > performance mapping and dispatch over the internet". We are now working for releasing of the V 1.0... Read more...

we have released the howto v 0.4 of VDD documentation, with a new section "documentation > how tos > Virt-Manager". We are now working on 0.5v in development area, feel free to contribute to it.... Read more...

we have updated the screenshot page with more images based on the launch script for the GUI development. In few day we rebuild the section of screeshot with some categories, stay tuned!... Read more...

http://en.wikipedia.org/wiki/Copy-on-writeCOW may also be used as the underlying mechanism for snapshots provided by logical volume managementhttp://wiki.xensource.com/xenwiki/COWHowToThe use of logical volumes (instead of loop files) is now almost given for suggested. Loop files had a big ad... Read more...

kernel 2.6.29.6-xen-dom0:wget http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.29.6.tar.bz2wget http://gentoo-xen-kernel.googlecode.com/files/xen-patches-2.6.29-6.tar.bz2patch (adapted from 2.6.31-r7 one):--- linux-2.6.29.6-xen-do... Read more...

In /usr/src/xen-sources, do:wget http://gentoo-xen-kernel.googlecode.com/files/xen-patches-2.6.31-7.tar.bz2wget http://aur.archlinux.org/packages/kernel26-xen-dom0/kernel26-xen-dom0/microcode_core-xen.patchwget ... Read more...

In order to minimize the amount of data transmitted over a X protocol channel, caching and compression systems can be used, so that X session applications are made more responsive.LBX, Low Bandwidth X, was one of the first project of this kind, but it has been dropped in 1997. It ran as a proxy server (lbxproxy). It cached commonly used information compressed data transmission over the network link.http://en.wikipedia.org/wiki... Read more...

Apparently, the suite for performance analysis we use, LMBench, is no longer available in form of packets. It is always possible, though, to download the source code. Procedure:1) download sources from http://sourceforge.net/projects/lmbench2) de-compress archive3) cd src/4) make lmbenchAnd in bin/ directory you'll find all tools you need!On top of that, the following ... Read more...

New xen-sources-2.6.31-r9 have been released. The ebuild is available here. Finally, the xen-sources-2.6.31-r7 have been replaced by the 9th release, since the r7 release has been deprecated due to many problems.... Read more...

we have released the howto v 0.3 of VDD documentation, with a new single "VM Launch Script" based on bash and zenity. We are now working on 0.4v  in development section, feel free to contribute to it.... Read more...

we have updated the screenshot page with more images based on Windows XP.... Read more...

Finally xen-sources-2.6.31-r7 have been released at gentoo-xen-kernel developers website. It would be very interesting to give it a try compiling them on Debian too. I personally tried the xen-sources-2.6.29-r4 obtaining great results (on Gentoo Linux, of course).  ... Read more...

Sometimes it could be useful to run Xephyr as root, but something unexpected may happen.For example, this could be a common problem: # Xephyr -ac :1No protocol specifiedXephyr cannot open host display. Is DISPLAY set? The solution is to log in as a normal user and issue the following command: # xauth list You will get something like this: VDDServer/unix:0  MIT-MAGIC-COOKIE-1  34tf17yt938rddd324j37b9a09e664... Read more...

we have released the how-to v  0.2 of VDD documentation, with new section: "X export - Xephyr", "Privacy Solution" and "VM Launch Scripts". This is still a work in progress version, so be patient and feel free to contribute to it. We are working on 0.3 v.... Read more...

I've just come back from Munich (Germany), from the First International Conference on Cloud Computing. I presented the paper "Virtual Distro Dispatcher: a light-weight Desktop-as-a-Service solution" which interested many people, asking me a lot of question about the project we are involved in.... Read more...

we have released the how-to v  0.1 of VDD documentation and updated the screenshot page with more images based on GNU/Linux Centos, Debian and Ubuntu with xfce, kde and gnome as desktop manager. These Linux distributions and desktop managers are the base of the next first step of performances test.... Read more...

The clustering solution implemented in this phase of development is for achieving High Availability. It is indeed possible to get Load Balancing too, by using Ganeti. Following this reference: http://www.howtoforge.com/xen-cluster-management-with-ganeti-on-debian-lenny it... Read more...

following this how-to http://www.asplund.nu/xencluster/xen-cluster-howto.html , including troubleshooting and comments section, bring us to achieve success in clustering our VM. the only difference is that we are working with more than one VM (3 at the moment) everything is working fine: synci... Read more...

Replacing xnest with Xephyr. Xephyr is a kdrive based X Server which targets a window on a host X Server as its framebuffer. Unlike Xnest it supports modern X extensions ( even if host server doesn't ) such as Composite, Damage, randr etc (no GLX support now). It uses SHM Images and shadow framebuffer updates to provide good performance. It also has a visual debugging mode for observing screen updates.http://www.freedesktop.org/wiki/Software/XephyrXephyr works fu... Read more...

Serious problems with Xorg:xorg-server version: 1.6.3.901same problems: crashUsing UML instead of Xen and Xorg 1.5.3-r6Launching:X -ac :1startkdeWe get blank screen of deathkded: ERROR: Communication problem with kded, it probably crashed.kcminit_startup: cannot connect to X server 192.168.1.100:1ksmserver: cannot connect to X server 192.168.1.100:1on the shell where X was started:Error... Read more...

Problems with Xorg-x11 7.4 e xorg-server 1.5.3-r6When KDE starts, X crashes.Configuration:app-emulation/xen 3.4.1app-emulation/xen-tools 3.4.1 (Xend daemon and tools)sys-kernel/xen-sources  2.6.29-r4x11-base/xorg-server 1.5.3-r6x11-base/xorg-x11 7.4Launched Xen virtual machine with debian.5-0.x86-64, kernel guest domU2.6.29-r4Then:export DISPLAY="ip_of_the_host:1"From the host system:Xnest -... Read more...

Useful for dispatching operating systems that do not use X. It is possible with Xen to start a VNC server, by modifying the start file of each virtual machine. LTSP script launch an application (vncviewer) with specific settings (to avoid compression and, hence, the load on thin client), and it connects to the particular machine. One must act on lts.conf in order to launch a script, that is similar to rdesktop, but it is adapted to VNC.... Read more...

One is not obliged to use LTSP for exporting X to terminals. LTSP is useful for booting up a system in a diskless machine AND for having a useful accounting system, to be used also for selecting available virtual machines to be dispatched on that machine.... Read more...

X gave this problem during testing:Fatal server error:xf86OpenConsole: Cannot open /dev/tty0 (No such file or directory)Example:thin-client up and logged inStarted a gnome-terminal. A terminal of the server appears.Logged as root.Launched xhost +Get this answer:unable to open display localhost:11.0launching: /usr/bin/X -ac :1we get:Fatal Server Errorxf86OpenConsole: Cannot open /d... Read more...