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[Qemu-discuss] troubleshoot vm start up and raw disk format

From: sho
Subject: [Qemu-discuss] troubleshoot vm start up and raw disk format
Date: Sat, 28 Apr 2012 07:58:39 -0400

hypervisor - ubuntu natty 2.6.38-13-server #57-Ubuntu SMP Mon Mar 5
19:52:44 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

a VM, also ubuntu based, was hanging on vm initiated reboot, without
any useful error messages.
virsh destroyed the domain, killed -9 the remaining process and can
not start up the vm now.
hangs at "Booting from Hard Disk" message.

the fs is active-active-drbd/ocfs2, in sync and clean, other VMs are
running in on the same fs.

tried copying the image to local disk and another system and had the
same issue starting up the vm.

libvirt debug 1 output doesn't show anything useful.

qemu-img doesn't seem to support any checking of raw disk format,
which is what we use as the default in all vms.

package info

ii  kvm
1:84+dfsg-0ubuntu16+0.14.0+noroms+0ubuntu4.5 dummy transitional
package from kvm to qemu-kvm
ii  qemu                            0.14.0+noroms-0ubuntu4.5
         dummy transitional package from qemu to qemu-kvm
ii  qemu-kvm                        0.14.0+noroms-0ubuntu4.5
         Full virtualization on i386 and amd64 hardware

full args

106      29758     1 99 12:53 ?        00:26:00 /usr/bin/kvm -S -M
pc-0.14 -enable-kvm -m 2048 -smp 2,sockets=2,cores=1,threads=1 -name
gal1 -uuid d93123c4-8d38-d4f8-6f92-9a9fcaa81efa -nodefconfig
-nodefaults -chardev
-mon chardev=charmonitor,id=monitor,mode=readline -rtc base=utc -boot
order=c,menu=off -drive
-drive file=/data/vm1/gal1-data.img,if=none,id=drive-virtio-disk1,format=raw
-netdev tap,fd=21,id=hostnet0 -device
-chardev pty,id=charserial0 -device
isa-serial,chardev=charserial0,id=serial0 -usb -vnc -vga
cirrus -device AC97,id=sound0,bus=pci.0,addr=0x4 -device
root     31431 9211 0 13:19 pts/4    00:00:00 grep --color=auto gal1

any ideas ?

thanks a lot in advance !

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