[Xen-users] Xen 3.0 and resources guarantees - CPU, RAM...

["Jordi Segues" <jordisd@xxxxxxxxx>]

Hello,

This is my first post in the mailing list. :)
I'm planning to use xen to virtualize some servers.
So I'm looking for info about resources guarantees, specially for CPU
and RAM for guests (and Dom0).

I've seen that in the conf file of each guest you can specify vcpu,
cputime and memory.
So in other documents and comparison between virtualization
technologies I've read that XEN doesn't provide resources guarantees,
and that you can't reserve CPU for each guest.

I'm a little confused.
How vcpu and cputime work?
How do you define how many vcpus you hardware have?
How do I have to understand cputime?
Are this parameters mandatorys? I mean can you reserve a CPU
percentage or time to a guest even if it doesn't use it?
Does memory parameter guaratees that amount of memory to the guest?

I've heard about Shareguard and SEDF-DC? Is this necessary with xen
3.0 or are similar features implemented in xen 3.0? (through vcpu,
cputime...)

PLEASE, could someone clear this?

Thank you very much in advance!

--
Jordi Segués Daina

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