Re: [Xen-users] Questions on qcow, qcow2 versus LVM

[Jorge Armando Medina <jmedina@xxxxxxxxxxxxxxx>]

Matthew Law wrote:
> On Tue, December 29, 2009 10:04 pm, Fajar A. Nugraha wrote:
>   
> > Another way to is to investigate why your earlier setup has problems.
> > To eliminate partition problems, you can map the disk to dom0  like
> > this:
> >
> > modprobe xenblk
> > xm block-attach 0 phy:/dev/vg_name/lv_name xvda w
> > ### do your stuff here. fdisk xvda, mkfs, ta, whatever. Use fdisk
> > instead of parted.
> > ### don't forget to umount afterwards
> > xm block-list 0
> > xm block-detach 0 51712 <== 51712 is the devid for xvda
> >
> > If that works, then it's 100% confirmed the problem is with
> > parted/kpartx. Repeat the test, but this time using parted instead of
> > fdisk, and you get the idea :D
> >     
> Thanks, Fajar! Using this method I could create a single partition on the
> LV with fdisk, format it as ext3, mount it and untar a vm image on it and
> boot the vm with pvgrub as before.  I then xm destroyed the domU and
> removed the LV with no problems - result!
>
> After this I set about trying to find which of the previous operations was
> holding the LV in the open state, so I started again with a clean lv and
> incrementally performed each operation on it and tried to remove it.  The
> error occurs after running:
>
> parted /dev/VolGroupVM/testvm mkpartfs primary ext2 0 10240
>
> So, parted is the culprit (or at least the first one to cause the
> problem).  Is there perhaps another, scriptable way to create the
> partitions on the LV?
>   
You can use fdisk and play with unix standar input, for example:

echo "d
n
p
1

+10000M
n
p
2


a
1
w
" | fdisk /dev/sdx

:) consider the blank lines to accept fdisk defaults for fist and last 
cilinder.
of course you can use a onliner:

printf 'n\np\n1\n\n+100M\nt\nfd\na\nn\np\n2\n\n\nt\n2\nfd\np\nw\n' | fdisk 
/dev/sdx
fdisk /dev/sda

Best regards.
> Matt.
>
>
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>   
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