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post #21 of 32
XEN is open source, Citrix offers XENserver. Citrix acquired XEN's source and offers it's own builds (contributing code back to XEN). I imagine the only money they make from it is support, and of course brand recognition.

On 21 October 2009, Citrix further announced their, now commercial, applications of XenServer would be fully open-source and made freely available to the public under the name Xen Cloud Platform (XCP)[4]. Simon Crosby, CTO of Virtualization and Management division at Citrix, stated: "XenServer is 100% free, and also shortly fully open sourced. There is no revenue from it at all."
    
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post #22 of 32
Open source doesn't mean it keeps working by magic. Someone has to pay the developers, which caused the mass migration to KVM in the first place - Xen is tightly tied to the linux kernel, and it was too expensive just to keep the thing working with current linux.

Citrix is the last holdout, but their server business is stagnant and now they are busy getting their desktop products to work with Hyper-V, which is basically a Xen clone with much cheaper licensing.

Since Xen seems to be viewed with universal distaste by the kernel development community, it's pretty unrealistic to suggest that it will live on as an all-volunteer project when Citrix dumps it. Just look at Xen on Solaris - dead now that Oracle isn't paying the bills, and it's highly unlikely a Solaris dom0 will ever see the light of day, open source or not.
Edited by thefreeaccount - 2/28/11 at 5:47am
post #23 of 32
Xenserver is NOT fully free. It has a basic free version, however it lacks certain features such as being able to move "live" VM's like you could with VMware's "Vmotion".

While Open source can be good; you really have to put good money and time into developing your product for it to be taken seriously. Plus it has to be good for enterprise users to want to use. Things such as not being able to install the hypervisor tools into the guest OS without it causing persistent BSOD's is a real bad thing.
Edited by trueg50 - 2/28/11 at 6:23am
    
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post #24 of 32
Live migration was one of the features that convinced me to abandon Xen (free version; some time ago) and move to KVM. The required hypervisor dom0 was another. (VMware's price tag was yet another.) Being able to manage virtual machines right from a little system tray icon on my desktop is nice, too.

If you need more than that, Red Hat's open source oVirt does pretty much everything that its enterprise big brother does, except for integrating into an MS Active Directory (though you could do this yourself if you really wanted).
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post #25 of 32
Quote:
Originally Posted by mrsmoke View Post
I use VirtualBox. It is free and works great. Very easy to setup!
This has never failed me. Works great in windows and linux.
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post #26 of 32
So, I see lots of comments about VMWare, live motion, Citrix etc.. but nobody has once pointed out that you can do resource pooling in Xen Server (though it has at 16 node limitation) which can give you failover capabilities and keep your instances online in the event that one of the nodes fails.

Fact of the matter is that your choice of hypervisor is doing to be dictated by your needs. If you dont have a good understanding of hypervisors, their features, how they work etc.. then you can ask this question to 500 people and get 500 different answers.

With that said... find out what you need first and go from there rather than basically typing in 'virtualization' into google.
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post #27 of 32
Quote:
Originally Posted by kc-tr View Post
So, I see lots of comments about VMWare, live motion, Citrix etc.. but nobody has once pointed out that you can do resource pooling in Xen Server (though it has at 16 node limitation) which can give you failover capabilities and keep your instances online in the event that one of the nodes fails.

Fact of the matter is that your choice of hypervisor is doing to be dictated by your needs. If you dont have a good understanding of hypervisors, their features, how they work etc.. then you can ask this question to 500 people and get 500 different answers.

With that said... find out what you need first and go from there rather than basically typing in 'virtualization' into google.
So you're promoting Xen server?

VMWare has High-Availability and Disaster Recovery options available too...
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post #28 of 32
I hope this doesn't turn into a debate like Windows/Mac/Linux. What do you need the virtualized environment for? VirtualBox isn't really that comparable to Xen I don't think because it's made to be run on a normal OS with web browsers and word processors running along side it. Xen is so intermingled with the OS is practically IS the OS e.g. can't really run anything else along side (and if you tried you're doing something wrong). They're two different things for different sets of needs.

Or to borrow from Mr. jobs: do you need a pick up with whatever a hemi is capable of towing several tons...or one of those little smart car things for buzzing about town...? Two different things for two different functions...
 
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post #29 of 32
Quote:
Originally Posted by subassy View Post
I hope this doesn't turn into a debate like Windows/Mac/Linux. What do you need the virtualized environment for? VirtualBox isn't really that comparable to Xen I don't think because it's made to be run on a normal OS with web browsers and word processors running along side it. Xen is so intermingled with the OS is practically IS the OS e.g. can't really run anything else along side (and if you tried you're doing something wrong). They're two different things for different sets of needs.

Or to borrow from Mr. jobs: do you need a pick up with whatever a hemi is capable of towing several tons...or one of those little smart car things for buzzing about town...? Two different things for two different functions...
The term I think you are looking for is "Bare metal hypervisor". With Xen, you have the OS, and in the OS runs Xen which handles the VM's. With ESXi/Xenserver you have VMware/Citrix making a very small linux kernel, and is built to just run VM's. This makes systems easier to manage, and cuts down on resource use.

"Bare metal hypervisor" hypervisor means that the hypervisor (xen/vmware/virtualbox) runs directly on the hardware, rather then installed on an existing OS.
    
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post #30 of 32
Quote:
Originally Posted by ComGuards View Post
So you're promoting Xen server?

VMWare has High-Availability and Disaster Recovery options available too...
No not specifically. I am just saying to build a list of requirements and find out which hypervisor fits your needs rather than starting a flame war by asking 'which one is best'.
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