Re: [Xen-devel] [PATCH 0/3] domUloader

["Philip R. Auld" <pauld@xxxxxxxxxxx>]

Rumor has it that on Thu, Jan 26, 2006 at 10:17:22AM -0000 Edwards, Nigel 
(Nigel Edwards) said:
> > 
> > I would really handle iSCSI in dom0 and export sdX/hdX to domU.
> > Solves the nasty OOM problem as well and makes your domains know
> > less about the underlaying storage. Which is good in my vision
> > of virtualization.
> > 
> There are good arguments for isolating storage management in Dom0.
> However, I have been looking at migration of domains with iSCSI
> and have found it a pain to fix up so that the iSCSI disk
> appears on the same /dev/sdx point in both source and destination
> Dom0s.

It should be possible to use udev to assign a specific unique name
to each disk based on UID or whatever iSCSI has for WWN support.
I think that would be the right fix. The order based /dev/sdX naming 
has been a deficiency in Linux proper for ever, but should be going
away at this point. 


Cheers,

Phil

> 
> That is why I have started looking at direct iSCSI attachment in DomU
> via initrd. Then storage is fixed up automatically via migration of
> network connections. The disadvantage of this, as Kurt points out,
> is that it exposes your iSCSI infrastructure into DomU.
> 
> Cheers,
> Nigel.
> 
> > -----Original Message-----
> > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> > Kurt Garloff
> > Sent: 23 January 2006 14:20
> > To: Philip R. Auld
> > Cc: Xen development list; Jeremy Katz
> > Subject: Re: [Xen-devel] [PATCH 0/3] domUloader
> > 
> > 
> > Hi,
> > 
> > On Fri, Jan 20, 2006 at 06:08:26PM -0500, Philip R. Auld wrote:
> > > Of course, that would mean support for root on iSCSI in the 
> > installer
> > > and mkinitrd code.
> > 
> > I would really handle iSCSI in dom0 and export sdX/hdX to domU.
> > Solves the nasty OOM problem as well and makes your domains know
> > less about the underlaying storage. Which is good in my vision
> > of virtualization.
> > 
> > Best,
> > -- 
> > Kurt Garloff, Head Architect, Director SUSE Labs (act.), Novell Inc.
> > 

-- 
Philip R. Auld, Ph.D.                          Egenera, Inc.    
Software Architect                            165 Forest St.
(508) 858-2628                            Marlboro, MA 01752

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