Re: [Xen-users] Best practice for Dom0

["Dirk H. Schulz" <dirk.schulz@xxxxxxxxxxxxx>]

Okay,

I will try less general answers to your very general questions:

Michael Lessard schrieb:

> Hi everybody !
>
> I would like to know what are the good practice in Dom0 utilisation  ...
>
> - Does it prefer that i use Dom 0 only for Xen Hypervisor ?
>  
It can e. g. depend on the load you want to place on the domUs and the 
file system. I am running domUs off LVM devices (with LVM in dom0) and 
found it to make that more reliable if dom0 does not make much itself 
AND is dedicated a cpu (on smp servers).
That is a load dependent issue. If your domUs are bored altogether or 
make their cpu share run wild at different times, you might not find any 
problems with LVM.
It especially is a problem when you use the snapshot feature of LVM 
(which is so handy that I still use it despite those problems).
In general you could say: If your domUs do things that put work on dom0 
(like using LVM partitions in my case) you might be better off not to 
use dom0 for anything else.
> - If yes, how much ram i need to reserv for Dom0  ?
>  
I have run dom0 without LVM snapshots with 64 MB of RAM (on Debian Sarge 
stable with a very basic install). With LVM snapshots they need 256 MB 
at least.
Dirk

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