Re: [Xen-users] very slow disk access

[Brian Krusic <brian@xxxxxxxxxx>]

> On Feb 26, 2011, at 6:25 PM, Brian Krusic wrote:
>
> > On Feb 26, 2011, at 6:11 PM, Randy Katz wrote:
> >
> > > it seems I am using tap:aio on what appears to be quite slow:
> > >
> > > disk = [ "tap:aio:/disk0/server3.img,xvda,w" ]
> > >
> > > Is there a good way to convert from tap:aio to lvm?
> >
> > Hi Randy,
> >
> > I don't use LVM and my performance is fine.
> >
> > Have you looked into the domU itself troubleshooting as if it were  
> > a non virtual host?
> > Things like vmstat, top, tcpdump, dstat, etc... just to get a  
> > snapshot of what your system is doing.
>
> Apply the same approach to dom0 as well.
>
> I've used both fixed and non fixed disk images w/o issue.
>
> My env is Centos using the bundled version of Xen as well as Gitcos  
> latest 3.X versions.
And my opinion is to keep your domU isolated and not have it use an fs  
that the dom0 can see (minus NFS, etc...), treating your domU as a  
real machine with the advantages of being virtualized.
- Brian



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