RE: [Xen-users] Newbie Xen + LVM issues for Debian DomU on Centos 5.2 DomO

[M C <m_c_001@xxxxxxxxxxx>]

To pre-empt my own question, it looks like the problem could be due to a full volume group:

root% vgdisplay
  --- Volume group ---
  VG Name               VolGroup00
  System ID            
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               148.91 GB
  PE Size               32.00 MB
  Total PE              4765
  Alloc PE / Size       4765 / 148.91 GB
  Free  PE / Size       0 / 0  
  VG UUID               jA3Sqk-H6Wm-zaeq-l0qq-rPrG-Yeud-C6CK5g
  
root% pvdisplay
  --- Physical volume ---
  PV Name               /dev/sdb2
  VG Name               VolGroup00
  PV Size               148.91 GB / not usable 4.15 MB
  Allocatable           yes (but full)
  PE Size (KByte)       32768
  Total PE              4765
  Free PE               0
  Allocated PE          4765
  PV UUID               CdZ7PD-RaRa-iKlu-HKlG-z8yA-eA43-x2mIVe
  
Looks like I'll need to free up some space using something like the approach mentioned in http://readlist.com/lists/centos.org/centos/2/12666.html.

Sigh. How annoying. What I don't get is how getting a Centos dom-U to install on this Centos dom-O doesn't require any of these frustrating diversions.

Regards,
mc  (not a Happy New Year so far)

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From: m_c_001@xxxxxxxxxxx
To: eduardo.grosclaude@xxxxxxxxx; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] Newbie Xen + LVM issues for Debian DomU on Centos 5.2 DomO
Date: Mon, 5 Jan 2009 14:39:43 +0000
CC:

Hi Eduardo,

Thanks for your reply (and happy new year!). Using xen-tools certainly appears simpler, though I still can't quite get there. If in the xen-tools.conf file I specify using logical volumes, then I get the error:

"The LVM partition image creation failed to create <whatever>
aborting"

where for <whatever> I've tried using LogVol00, VolGroup00-LogVol00 and mapper/VolGroup00-LogVol00, all with no success. Here's the output from "df -h" and "lvdisplay -C":

root% df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      143G   24G  112G  18% /
/dev/sdb1              99M   36M   59M  38% /boot
tmpfs                 1.2G     0  1.2G   0% /dev/shm

root% lvdisplay -C
  LV       VG         Attr   LSize   Origin Snap%  Move Log Copy%  Convert
  LogVol00 VolGroup00 -wi-ao 146.97G                                     
  LogVol01 VolGroup00 -wi-ao   1.94G

Once again, any clues and/or hints as to where I'm going wrong would be much appreciated.

Regards,
mc

> Date: Tue, 30 Dec 2008 11:03:09 -0300
> From: eduardo.grosclaude@xxxxxxxxx
> To: m_c_001@xxxxxxxxxxx
> Subject: Re: [Xen-users] Newbie Xen + LVM issues for Debian DomU on Centos 5.2 DomO
>
> On Tue, Dec 30, 2008 at 5:35 AM, M C <m_c_001@xxxxxxxxxxx> wrote:
> >
> > Hi Thomas,
> >
> > Thanks for replying. So, I added the following line to my config file:
> >
> > ramdisk = "/boot/initrd-2.6.18-92.1.22.el5xen.img"
> >
> > and things do indeed go further, but still ultimately fail. The final error
> > report now has:
> >
> > <lots of stuff deleted>
> (snip)
> > Scanning logical volumes
> > Reading all physical volumes. This may take a while...
> > No volume groups found
> > Activating logical volumes
> > Volume group "VolGroup00" not found
> (snip)
> > Any hints of how I can extricate myself from this mess would be much
> > appreciated!
>
> Your regular RedHat/CentOS initrd looks for a root file system on LVM
> devices (if so chosen at install time, which is the default), whilst
> your Debian image has no logical volumes defined.
>
> You can a) install your VM over LVM, b) edit your initrd by deleting
> every reference to LVMs --but this is a rather messy procedure, or c)
> create a custom initrd with something like (syntax, or even
> correctness not guaranteed):
>
> DIR=/some/directory; mount -t ext3 -o loop debian.4-0.64.img $DIR
> mkinitrd -v --preload xenblk --preload xennet --omit-lvm-modules
> --omit-raid-modules \
> --fstab=$DIR/etc/fstab -f /boot/custom-initrd-xen.img 2.6.18-92.1.22.el5xen
>
> All in all, I'd follow Thomas's suggestion to use xen-tools to setup your VMs.
> HTH
>
> --
> Eduardo Grosclaude
> Universidad Nacional del Comahue
> Neuquen, Argentina

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