Re: [Xen-users] IO caching at dom0 level

["Olivier B." <xen.list@xxxxxxxxx>]

Fajar A. Nugraha wrote:
> On Mon, Sep 7, 2009 at 11:13 PM, Olivier B.<xen.list@xxxxxxxxx> wrote:
>   
> > Hi,
> >
> > is there a way to maintain an IO cache on dom0 for all domU ?
> >     
> Generally not recommended as it could cause data corruption on domU side.
> If you REALLY want to use it anyway despite the consequences, AFAIK
> file:/ does that by default, and it should work even for block
> devices.
>   
Well if you only do read caching, what problem can you have ?
And for write caching, the problem is the same as for write cache on 
RAID cards, so barriers should already avoid problems with that, no ?
I will look at your suggestion, thanks.

> > I have near 1Go not used ram on a Dom0, and would like to use this memory to
> > speedup all the domU. All my domU use LVM phy devices.
> >     
> 1G is not much :P. IMHO you better add it to the busiest domU.
Well to simulate a "raid hard card", it's enough I think ;)

Olivier

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