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RE: [Xen-users] xen guidelines

  • To: "Tom Brown" <tbrown@xxxxxxxxxxxxx>
  • From: "JHJE (Jan Holst Jensen)" <jhje@xxxxxxxxxxxxxxx>
  • Date: Tue, 12 Apr 2005 10:51:39 +0200
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 12 Apr 2005 08:51:46 +0000
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcU+9l4O7ZIYf8wyQAiJaRPkcXJzLgARSDqQ
  • Thread-topic: [Xen-users] xen guidelines

> I would like to ask a variant of the original question. Will 
> extra memory
> allocated to dom0 effectively become disk cache for all the domU's ?

Thanks Tom. That is precisely what I was trying to ask.

> AFAIK, that is like asking what type of vehicle you should 
> buy for work.
> (Without specifying what kind of work you do :-)
> Database servers, mail servers, webservers, compute nodes, 
> etc have far
> different usage patterns. Whether any of those services are in dom0 or
> domU may be significant.

I would setup the server so that dom0 does nothing but provide I/O
services and control the domU's. I am used to running GSX so I am
thinking along the lines dom0="host OS" and domU="guest OS".

> > I guess that there is no great need for driver memory in 
> case a domU is
> > running off physical partitions since the disk access then 
> goes directly
> > through the hypervisor (?). But what about when dom0 is serving
> No. It still goes through the dom0 kernel to get to the hard 
> drives, as

Ah yes. Of course. Thanks for clearing that up.

-- Jan

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