Re: Xen in a production environment
Sorry, I haven't looked at that. No tests run yet (I had to drop off
to a different project). From just running it, it did not look like
too much. Plus, since I used loopback for the virtuals, I'm sure I
had a worst case scenario (there are much more efficient ways of
doing it).
The box is still up, so if you tell me what you would like me to run
I'll be happy to do it. As soon as I get a few minutes, I intend to
redo the machine and try it again. The targetted use will be very
simple, however; We are going to use it as our inhouse data store
and use some virtual domains to test new apps on before we deploy.
Rod
Ritesh Raj Sarraf said:
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> I have not used Xen (I use qemu for testing other OS's). I am just
> curious
> to know how much of overhead do the guest OS's create on the host OS
> even
> when the resources are _separate_.
>
> Regards,
> rrs
>
> R. W. Rodolico on Wednesday 30 Nov 2005 06:40 wrote:
>
>> Am not using it in production, but do have xen 3 beta installed.
>>
>> I did install xen 2, but it uses the older 2.6 kernel with had
>> some
>> problems with some of the newer hardware. You are pretty locked
>> into
>> the kernel they have modules for, but when I got it installed, it
>> was pretty sweet. I used loopback mounted files for my devices,
>> which is likely not the optimum solution, but it worked pretty
>> well.
>> On a 2GHz Athlon with 2G of RAM, I allocated 512M for each of
>> three
>> virtuals and the remainder to Domain0. When I fired them all off,
>> it
>> was pretty good, ie it felt like four 500M Hz computers.
>>
>> That being said, when a domain has been idle for a while, it does
>> take a noticable amount of time for it to wake up and take its
>> share
>> of the cpu. I let one stay idle for a while (while the others were
>> kept busy), then fired off a process. Seems like it took a second
>> or
>> two for it to say "Hey, I want some cycles also" and over a period
>> of around 30 seconds or so it seemed to slowly gain speed as it
>> took
>> more and more cycles. I know there are some parameters than can be
>> tweaked to modify some of this behavior
>>
>> Like I said, have not done it in production the way you are
>> talking
>> about. I think it would be worth checking into, however, if you
>> have
>> a lot of domains that don't do much most of the time. And, from
>> what
>> I've read, when Xen 3 is stable, you can get an Athlon 64 and a
>> lot
>> of the task switching is done in the CPU, so that will be very,
>> very
>> nice.
>>
>> Rod
>>
>>
>>
>>
>> Simon said:
>>> Hi There,
>>>
>>> Wondering if anyone has used or is using Xen (open-source
>>> virtualization) in a production environment? Any comments if so?
>>>
>>> (for virtual hosting services)
>>>
>>> Simon
>>>
>>>
>>
>>
>
> - --
> Ritesh Raj Sarraf
> RESEARCHUT -- http://www.researchut.com
> Gnupg Key ID: 04F130BC
> "Stealing logic from one person is plagiarism, stealing from many is
> research."
> "Necessity is the mother of invention."
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