[Xen-users] Re: How to kown the DomU is up

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sat, May 15, 2010 at 12:48:34AM +0800, lei yang wrote:
>    Hi experts,
> 
>    First I post my log
> 
>    [2]root@intel_5500_server:/> xm list
>    Name                                        ID   Mem VCPUs      State
>    Time(s)
>    Domain-0                                     0 12737     8     r-----
>    26.7
>    xx.cfg                                       3   128     2     -b----
>    2.7
>    [3]root@intel_5500_server:/>
> 
>    does it mean the domU boot up?
> 

You should check the guest console:

xm console xx.cfg


>    2. one anther question is, which kernel module is for /dev/xvda
> 
> 
>    3.my domU cfg file is
>    [4]root@intel_5500_server:/> cat xx.cfg
>    disk = ['phy:/dev/sda,xvda,w' ]

Is /dev/sda unused disk? 
If /dev/sda is the disk you boot dom0 from then you can't use it for the guest!

>    kernel = "/vmlinuz-2.6.31.13"
>    vcpus=2
>    extra = "3 selinux=0 enforcing=0"

On the extra-line you should have also "earlyprintk=xen console=hvc0" 
to make the console work.

>    root = "/dev/xvda1 ro"
> 
> 
>    and my dom0 root=/dev/sda1 and my disk just has one sda1 partition. can I
>    use /dev/xvda1 for domU, I'm not sure what's the relations between
>    /dev/sda1 and /dev/xvda1
> 

I'm confused.. Are you trying to use the _same_ disk for the guest as you use 
for dom0?
You can't do that.

You need to have another disk for the guest, or an image file, or lvm volume..

>    4. I create the device by
>    mknod /dev/xvda b 202 0
>    mknod /dev/xvda1 b 202 1
>    when I mount -t ext3 /dev/xvda /
> 
>    [5]root@intel_5500_server:/> mount -t ext3 /dev/xvda /
>    mount: /dev/xvda is not a valid block device
>    does it mean my xvda device driver is not loaded
> 

xvda is the device name in the *guest*, which means the guest kernel
will see the virtual disk as /dev/xvda.

-- Pasi



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