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[Qemu-devel] [Bug 613529] Re: qemu does not accept regular disk geometry


From: Hadmut Danisch
Subject: [Qemu-devel] [Bug 613529] Re: qemu does not accept regular disk geometry
Date: Fri, 06 Aug 2010 13:25:32 -0000

has been (orally) confirmed by other users.

It is effectively impossible to reliably install a system on an lvm
logical device and run it under kvm/qemu

-- 
qemu does not accept regular disk geometry
https://bugs.launchpad.net/bugs/613529
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Status in QEMU: New

Bug description:
Hi, 

I am currently hunting a strange bug in qemu/kvm:

I am using an lvm logical volume as a virtual hard disk for a virtual machine. 

I use fdisk or parted to create a partition table and partitions, kpartx to 
generate the device entries for the partitions, then install linux on ext3/ext4 
with grub or msdos filesystem with syslinux. 

But then, in most cases even the boot process fails or behaves strangely, 
sometimes even mounting the file system in the virtual machine fails. It seems 
as if there is a problem with the virtual disk geometry. The problem does not 
seem to occur if I reboot the host system after creating the partition table on 
the logical volume. I guess the linux kernel needs to learn the disk geometry 
by reboot. A blkdev --rereadpt does not work on lvm volumes. 

The first approach to test/fix the problem would be to pass the disk geometry 
to qemu/lvm with the -drive option. Unfortunately, qemu/kvm does not accept the 
default geometry with 255 heads and 63 sectors. Seems to limit the number of 
heads to 16, thus limiting the disk size.





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