Re: [Xen-users] virtual machine lvm issues during install

[Jock Coats <jock.coats@xxxxxxxxxxxxxxxxx>]

I'm no expert and completely new to all this too, but the one part of  
installing Xen I didn't have trouble with was LVM.
I'm not sure you've got the whole idea of LVM right here.  It  
shouldn't be creating an .img file at all.
You don't create a logical volume, that's what Xen creates when it  
creates the machine.  You give it a Volume Group into which it creates  
a logical volume of the size dictated by your virtual machine creation  
parameters.
Or have I got the wrong end of the stick of your question?

So, by all means create a Volume Group using your entire disk space  
(in fact I created several physical partitions, one volume group and  
added all those partitions to that group, because I was advised that  
LVM drops partitions if they ever begin to get bad sectors so I didn't  
want it to drop my entire disk in such an eventuality).  Then (I was  
using xen-tools) put the name of that Volume Group in the xen- 
tools.conf file and then, when I invoke the creation script it creates  
a new logical volume (two if you also want it to have a swap partition).
Those resultant logical volumes appear in /dev/<volume group>/ as new  
block devices and not as .img files.
Does that give any clues?

Jock

On 29 Aug 2008, at 17:38, Charlie Reddington wrote:

> Thanks for the reply I'll fill in some blanks..... I normally  
> disable selinux accross the board but I haven't done so yet. I have  
> however set it to permissive, assuming it would let things slide but  
> only complain about it.
> I'll give it a whack with selinux disabled and see if it has any  
> changes for me.....
> On Aug 29, 2008, at 11:16 AM, Joseph L. Casale wrote:
>
> > > disk = [ "tap:aio:/var/lib/xen/images/vm-01-dns-2.img,xvda,w" ]
> > I haven't used tap:aio, and I also use ' not " but looks fine I  
> > guess?
> > Using SELinux I presume:)
> >
> > > It goes through and I just pick the default layout, which sets it up
> > > with an LVM. (this is where I think I may be wrong in doing so?)
> > Ahh, so it's the guest vm that gives the error?
> >
> > > After the point of setting up my disk space it goes on to format the
> > > filesystem, and fails almost immediately with a somewhat large dump
> > > ending with that origanl message.
> > It obviously sees the disc but pukes on writing to it?
> Correct
> > So you have exported it *into* your guest correctly, but it has  
> > issues writing
> > which leads me to maybe an SELinux issue? Go into /var/lib/xen/ 
> > images and do an ll -Z.
> I get this for all my images...
>
> -rwxrwxr-x  root root system_u:object_r:xen_image_t    vm-01-dns-2.img
>
> > Look at your image file, does it have the right context?
> > Go here for explanation, http://wiki.centos.org/TipsAndTricks/Xen
> And it appears that I have the right context from my understanding  
> of it.
> > HTH,
> > jlc
> >
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