[Xen-users] pygrub lvm partition & grub.cfg question

[Bruce Edge <bruce.edge@xxxxxxxxx>]

I install a domU using: 

disk        = [ 'phy:system/dpm_0,xvda:sda,w', 'file:/lucid.iso,xvdc:cdrom,r' ]

During the install I see the partition map as:

~ # sfdisk -d /dev/sda

Warning: extended partition does not start at a cylinder boundary.

DOS and Linux will interpret the contents differently.

# partition table of /dev/sda

unit: sectors

/dev/sda1 : start=     2048, size=  9226240, Id=83

/dev/sda2 : start=  9230334, size=   532482, Id= 5

/dev/sda3 : start=        0, size=        0, Id= 0

/dev/sda4 : start=        0, size=        0, Id= 0

/dev/sda5 : start=  9230336, size=   532480, Id=82

sda1 = /

sda5 = swap

so far so good.

After running partprobe, I see the embedded partitions:

brw-rw---- 1 root disk 250,  4 Jul 10 12:06 system-dpm_0

brw-rw---- 1 root disk 250,  8 Jul 10 09:25 system-dpm_0p1

brw-rw---- 1 root disk 250,  9 Jul 10 09:25 system-dpm_0p2

brw-rw---- 1 root disk 250, 10 Jul 10 09:25 system-dpm_0p5

Still OK.

Now it gets weird. I mount the domU / to edit grub.cfg:

# mount /dev/mapper/system-dpm_0p1 /mnt/dpm

# vi /mnt/dpm/boot/grub/grub.cfg

-- add a new boot entry --

# umount /mnt/dpm

pygrub /dev/mapper/dpm_0:

    pyGRUB  version 0.6

 ┌────────────────────────

 │ dpm-domu , with Linux 2.6.32.16         

The 2nd boot entry is missing - why is it not seeing the embedded partition?

But if I run

pygrub /dev/mapper/dpm_0p1, I see the new boot entry::

    pyGRUB  version 0.6

 ┌────────────────────────

 │ dpm-domu , with Linux 2.6.32.16 

 │ dpm-domu , with Linux 2.6.32      

Shouldn't pygrub see the 2nd boot entry when pointed at the lvm partition /dev/mapper/system-dpm_0 

as opposed to the embedded partition pygrub /dev/mapper/dpm_0p1 ?

Where is the second copy of the grub.cfg?

I thought there was no boot sector grub.cfg anymore.

Is that not the case?

-Bruce

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