who cames from xen?

who cames from xen?

[Mauro]

I'm using xen for years with no problems in my production environments.
Now I want to try kvm.
Any experiences here from xen to kvm?

Re: who cames from xen?

[Nikola Ciprich]

Hi,
I switched from XEN to KVM long time ago, and haven't felt sorry since then...
Are You interestid in something in particular?
n.

On Thu, Feb 10, 2011 at 03:28:10PM +0000, Mauro wrote:
> I'm using xen for years with no problems in my production environments.
> Now I want to try kvm.
> Any experiences here from xen to kvm?
> --
> To unsubscribe from this list: send the line "unsubscribe kvm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

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Re: who cames from xen?

[Mauro]

On 10 February 2011 19:30, Nikola Ciprich <extmaillist@linuxbox.cz> wrote:
> Hi,
> I switched from XEN to KVM long time ago, and haven't felt sorry since then...
> Are You interestid in something in particular?

Then.....I'm interested on your motivations to switch from xen to kvm.
If it's important I use debian squeeze.

Re: who cames from xen?

[Dan VerWeire]

I switched from Xen to KVM a couple years ago for the following reasons IIRC:

-Xen was stuck on an older kernel that did not have the drivers I needed
-Ubuntu decided to switch their focus to KVM as their main
virtualization package
-KVM had more solid Windows network drivers
-I personally didn't like the Dom0/DomU concept I just want my VMs to
be processes on the host just like any other process
-KVM was in the kernel which gave me a good feeling about the
longevity and support of the project

I am a sys admin (among other things) for a wholesale distribution
company. We have 28 virtual machines on 3 different hosts. They are a
mixture of Windows and Linux. I am extremely happy with KVM and
Ubuntu's support of KVM. It is awesome to get new features like KSM
and Ceph block devices (which I haven't used yet but am very excited
about) as the kernel and KVM evolve.

I can say that, in my experience, our VMs run more solid on KVM than
they did on Xen and even more solid than on bare metal, especially in
the case of Windows.

Thank you KVM developers.

Dan VerWeire


On Thu, Feb 10, 2011 at 4:20 PM, Mauro <mrsanna1@gmail.com> wrote:
> On 10 February 2011 19:30, Nikola Ciprich <extmaillist@linuxbox.cz> wrote:
>> Hi,
>> I switched from XEN to KVM long time ago, and haven't felt sorry since then...
>> Are You interestid in something in particular?
>
> Then.....I'm interested on your motivations to switch from xen to kvm.
> If it's important I use debian squeeze.
> --
> To unsubscribe from this list: send the line "unsubscribe kvm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Re: who cames from xen?

[Freddie Cash]

On Thu, Feb 10, 2011 at 1:53 PM, Dan VerWeire <dverweire@gmail.com> wrote:
> I switched from Xen to KVM a couple years ago for the following reasons IIRC:

We're in the process of switching from Xen to KVM, for similar
reasons, but also to get away from the hassle that is configuring Xen,
especially with the crap that is Grub2.  With KVM, it's easy to run
"Linux Version X" on the host, and "Linux Version X+Y" as guests.

Trying to get that setup to work with Xen, especially with Grub1 on
the host, and the VMs wanting Grub2 (aka using Debian Lenny for Dom0
and Debian Squeeze for DomU) was an extreme exercise in frustration.
Doing the same with KVM is a snap.

The whole Dom0/DomU split is a hassle as well.

Now that all CPUs (well, at least all of AMD's CPUs) support hardware
virt, I honestly do not see a reason to use Xen.  It's just not worth
the hassle for a theoretical couple % better performance.

> Thank you KVM developers.

Wholeheartedly agree!!!

-- 
Freddie Cash
fjwcash@gmail.com

Re: who cames from xen?

[Alejandro Leyva]

We have switched for the same reasons one year ago. We have 50
physical servers and around 400 VM's on them, ranging from single
hosts with RAID 1 internal  storage to iSCSI solutions.

On Thu, Feb 10, 2011 at 3:53 PM, Dan VerWeire <dverweire@gmail.com> wrote:
> I switched from Xen to KVM a couple years ago for the following reasons IIRC:
>
> -Xen was stuck on an older kernel that did not have the drivers I needed
> -Ubuntu decided to switch their focus to KVM as their main
> virtualization package
> -KVM had more solid Windows network drivers
> -I personally didn't like the Dom0/DomU concept I just want my VMs to
> be processes on the host just like any other process
> -KVM was in the kernel which gave me a good feeling about the
> longevity and support of the project
>
> I am a sys admin (among other things) for a wholesale distribution
> company. We have 28 virtual machines on 3 different hosts. They are a
> mixture of Windows and Linux. I am extremely happy with KVM and
> Ubuntu's support of KVM. It is awesome to get new features like KSM
> and Ceph block devices (which I haven't used yet but am very excited
> about) as the kernel and KVM evolve.
>
> I can say that, in my experience, our VMs run more solid on KVM than
> they did on Xen and even more solid than on bare metal, especially in
> the case of Windows.
>
> Thank you KVM developers.
>
> Dan VerWeire
>
>
> On Thu, Feb 10, 2011 at 4:20 PM, Mauro <mrsanna1@gmail.com> wrote:
>> On 10 February 2011 19:30, Nikola Ciprich <extmaillist@linuxbox.cz> wrote:
>>> Hi,
>>> I switched from XEN to KVM long time ago, and haven't felt sorry since then...
>>> Are You interestid in something in particular?
>>
>> Then.....I'm interested on your motivations to switch from xen to kvm.
>> If it's important I use debian squeeze.
>> --
>> To unsubscribe from this list: send the line "unsubscribe kvm" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
> --
> To unsubscribe from this list: send the line "unsubscribe kvm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Re: who cames from xen?

[Nikola Ciprich]

Well,

mine are pretty much the same as of those who already replied.
to emphasize the most important for me:
- xen developers didn't seem that much interested to push everything
into mainline, in general kvm developmen process seem much open to me..,
- it was problematic for me to use some of new features we needed for such old kernels
XEN's been based on
- after the xen has been bought by citrix, future course was unclear
- redhat which we've based our distro upon switched to KVM as well (and bought qumranet)
- since KVM runs VMs as normal processes, there are better possibilities to
use various types of "shaping" using cgroups etc.
- KVM seems to be simpler to debug to me and community is pretty friendly here

well, thats enough I guess :)
all I have to say is that I too am pretty gratefull to KVM and also QEMU developers.
thanks guys!

nik



On Thu, Feb 10, 2011 at 09:20:17PM +0000, Mauro wrote:
> On 10 February 2011 19:30, Nikola Ciprich <extmaillist@linuxbox.cz> wrote:
> > Hi,
> > I switched from XEN to KVM long time ago, and haven't felt sorry since then...
> > Are You interestid in something in particular?
> 
> Then.....I'm interested on your motivations to switch from xen to kvm.
> If it's important I use debian squeeze.
> --
> To unsubscribe from this list: send the line "unsubscribe kvm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

-- 
-------------------------------------
Ing. Nikola CIPRICH
LinuxBox.cz, s.r.o.
28. rijna 168, 709 01 Ostrava

tel.:   +420 596 603 142
fax:    +420 596 621 273
mobil:  +420 777 093 799
www.linuxbox.cz

mobil servis: +420 737 238 656
email servis: servis@linuxbox.cz
-------------------------------------