Posts Tagged ‘Intel’

Damn you C-states! (Unexpected XenServer reboot)

Written by Ingmar Verheij on February 21st, 2012. Posted in XenServer

Processors have the ability to save energy by entering a low-power mode. Each processor has serveral power modes called “C-states”. The C-states are introduced with the 486DX4 processor and are still present in the current processors. Over time more C-states are introduced to lower the power consumption and save energy.

Hypervisors (used to virtualize desktops or servers) like Citrix XenServers or Microsoft Hyper-V can have issues with  C-states causing them to freeze, BSOD or slow down. This happens when C-state 3 “Sleep” or higher is enabled the BIOS.

XenDesktop 4 released, XenClient delayed.

Written by Ingmar Verheij on October 9th, 2009. Posted in XenClient

Yesterday I spoke a representative of Citrix in The Hague. Topic of discussion was XenDesktop, XenClient and why the release of XenClient was delayed to Q1 2010.
Last June Citrix CEO Mark Templeton announced XenClient to be released in H2 2009, for free. This was during the openening keynote at iForum in Antwerp (this was already announced at Synergy).

What is XenClient?
For those of you who don’t know what XenClient is, XenClient is a client hypervisor for desktops / laptops. The client hypervisor creates an isolated environment for multiple virtual machines with (almost) native performance. This solution (probably) creates the following use-cases:
– Private and work environment (completely isolated from each other);
– Multiple OS versions running at the same time during transition (XP / Win7 / MacOS);
– Demo’s with multiple VM’s including a console (instead of a master image and type 2 vm’s);
– On demand streaming of OS to desktops / laptop (instant migration!);
– Offline VDI in combination with XenDesktop;
– Single image for all models (especially useful with laptops);

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