Xen project Mailing List

On Tue, Apr 1, 2008 at 8:12 AM, Alain BARTHE <alain.barthe@xxxxxxxx> wrote:

Hi Simone,

kpartx is our friend :

kpartx -a /dev/XenVG/qanew

Then look in /dev/mapper, you should see a new entry named something like "qanewpa", then

mount /dev/mapper/qanewpa /opt/test

should work. If so, do the same with your swap.

Cheers.

Alain

xen-users-bounces@xxxxxxxxxxxxxxxxxxx a écrit sur 31/03/2008 17:02:42 : > Hi again, > > I am afraid I will have to ask fro more advice. I have followed the > suggestions, basically: > > Created an LV /dev/XenVG/qanew and /dev/XenVG/qanew_swap (no > filesystem created on it) > > in the conf file for the VM I have: > > disk = [ 'phy:XenVG/qanew,xvda,w', 'phy:XenVG/qanew_swap,xvdb,w' ] > > I create only one partition xvda1 mounted as / and filesystem ext3 > while xvdb1 is used as swap, and GRUB is installed on MBR > > Once the installation is done and the VM is not on, I try to mount > /dev/XenVG/qanew on /opt/test but it complains I need to specify > filesystem, if I run mount -t ext3 .... it complains it is not an > ext3 filesystem. > > I have been on the net trying to understand where i am going wrong > but can't seem to find any valid solution. > > Any further help would be much appreciated. > > Thanks, > > Simone >

> On Mon, Mar 31, 2008 at 11:19 AM, Simone <dezmodue@xxxxxxxxx> wrote:
> Thanks all for your replies. > > Considering the trouble I would have to go through and the fact that > I don't need snapshotting within the VM, I am moving to a simpler > configuration as suggested. > > Thanks again, > > Simone
>
> On Mon, Mar 31, 2008 at 2:49 AM, Jayson Charles Vantuyl < > jvantuyl@xxxxxxxxxxxxxx> wrote:
> It's not so unusual. It just wasn't easy to come across before > widespread virtualization.
> > Nesting LVM setups like this CAN be done, but generally shouldn't.
> > Essentially, LVM works by detecting the physical volumes that are > part of the LVM. Since you are setting up an LVM that is > effectively on another LVM device, the detection can get weird-- > especially if you name an inner LVM volume group the same name as an > external LVM volume group. Let's just say that mixing LVM data from > the inner and outer devices can happen, and then things can get really broken.
> > The easiest way to do this (and it's not so easy) is to set up LVM > to scan your other LVM devices using a second lvm.conf. Essentially > you configure both copies of LVM (the internal one and the external > one) in separate files with careful limits on which devices may be > scanned for PVs.
> > A generally better solution is just to use LVM on the outside and > pass through the LVs to look like local disks. The downside is that > it requires cooperation from the Dom0 to resize and snapshot; and > that FS extensions currently require rebooting the VM to pick up the > size changes. The upside is the LVM is really simple to manage if > you just do it outside, and the volume is available to the Dom0 for > mounting like you described.
> > Unless you absolutely need snapshotting normally inside or live > resizing, I wouldn't go through the trouble of running LVM inside of > LVM. It is fraught with peril.
> > I am aware that you are going to have to reinstall your systems, > but, if they are doing anything important, you should avoid things > that can fatally confuse LVM (like nested LVM setups). While you're > at it, don't partition the disks inside of the DomUs either. Just > pass through the partitions directly.
> > Good luck.
> > On Mar 30, 2008, at 4:34 PM, Simone wrote:
> I guess I am trying to do something unusual :) > > Any thoughts? > > Simone >
> On Fri, Mar 28, 2008 at 6:47 PM, Simone <dezmodue@xxxxxxxxx> wrote:
> Hi list, > > I am experiencing with xen on centos5 and so far everything is going > well, I am really pleased. The domU have a dedicated LV > (/dev/vg1/xenVM1, /dev/vg1/xenVM2 etc) and the guest OS is Centos4. > At guest install time I have choosen to use LVM so that also inside > the guest I have /dev/vg0/root, /dev/vg0/tmp etc. Is there a way to > mount and edit the guest filesystem to customize files etc? > The idea would be to have a guest template that can be cloned and > then edited to generate new VMs. > > Thanks, have a good weekend > > Simone >
> > _______________________________________________ > Xen-users mailing list > Xen-users@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-users
> >
> --
> Jayson Vantuyl
> Systems Architect
> Engine Yard
> jvantuyl@xxxxxxxxxxxxxx
> 1 866 518 9275 ext 204
> > _______________________________________________ > Xen-users mailing list > Xen-users@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-users

Re: [Xen-users] Re: Accessing an LV domU