Re: KVM-74: HELP PLEASE - cannot boot from cdrom for recovery

[Gerry Reno <greno@verizon.net>]

Tomasz Chmielewski wrote:
> Gerry Reno schrieb:
>> Gerry Reno wrote:
>>> Gerry Reno wrote:
>>>> Javier Guerra wrote:
>>>>> On Tue, Mar 31, 2009 at 12:01 PM, Gerry Reno <greno@verizon.net> 
>>>>> wrote:
>>>>>  
>>>>>> Charles Duffy wrote:
>>>>>> I put the xml stanza in the file and undefine/define domain but 
>>>>>> it gives an
>>>>>> error about cannot read image file.
>>>>>> <source file=/media/Fedora 10 DVD"/>
>>>>>> And I check this path and I can read all the files from the 
>>>>>> command line on
>>>>>> the DVD just fine.
>>>>>> What could be the problem?
>>>>>>     
>>>>>
>>>>> don't put a mount dir, either use a ISO image, or the cdrom device 
>>>>> file
>>>>>
>>>>>
>>>>>   
>>>> Ok, a little closer now.  I put this in xml file and redefine 
>>>> domain and it now defines:
>>>>
>>>> <source file=/dev/sr0"/>
>>>> This was device that mount showed as mounting the DVD.
>>>>
>>>> But when the domain boots and I select 3. CDROM from screen, it 
>>>> still shows the original boot error:
>>>> Boot Failure Code:  0003
>>>> Boot from CDROM failed:  cannot read the boot disk.
>>>> FATAL: No bootable device.
>>>> What should I change?
>>>>
>>> Here is what command looks like now using 'ps':
>>> /usr/bin/qemu-kvm -S -M pc -m 512 -smp 2 -name MX_3 -monitor pty 
>>> -boot c -drive 
>>> file=/var/vm/vm1/qemu/images/MX_3/MX_3.img,if=ide,index=0,boot=on 
>>> -drive file=/dev/sr0,if=ide,media=cdrom,index=3 -net 
>>> nic,macaddr=00:0c:29:e3:bc:ee,vlan=0 -net 
>>> tap,fd=17,script=,vlan=0,ifname=vnet1 -serial none -parallel none 
>>> -usb -vnc 127.0.0.1:1 -k en-us
>>>
>> And I try other disk type:
>> <disk type='block' device='cdrom'>
>> But that produces the same error.
>>
>> What else can I add in order to boot from cdrom?
>
> What does:
>
> md5sum /dev/sr0
>
> output?
>
>
DVD is Fedora 10 DVD (i386)

Four cases:

# desktop user; DVD unmounted
$ md5sum /dev/sr0
md5sum: /dev/sr0: Input/output error

# desktop user; DVD mounted
$ md5sum /dev/sr0
ff311b322c894aabc4361c4e270f5a3f  /dev/sr0

# root user; DVD unmounted
$ md5sum /dev/sr0
md5sum: /dev/sr0: Input/output error

# root user; DVD mounted
$ md5sum /dev/sr0
md5sum: /dev/sr0: Input/output error

# 'ps' shows process is running as root:
root      7311  2927 99 13:08 ?        00:20:01 /usr/bin/qemu-kvm -S -M 
pc -m 512 -smp 2 -name MX_3 -monitor pty -boot c -drive 
file=/var/vm/vm1/qemu/images/MX_3/MX_3.img,if=ide,index=0,boot=on -drive 
file=/dev/sr0,if=ide,media=cdrom,index=3 -net 
nic,macaddr=00:0c:29:e3:bc:ee,vlan=0 -net 
tap,fd=17,script=,vlan=0,ifname=vnet1 -serial none -parallel none -usb 
-vnc 127.0.0.1:1 -k en-us


Regards,
Gerry