Re: [Xen-users] 2 instances of a DomU on the same LV

["Fajar A. Nugraha" <fajar@xxxxxxxxx>]

On Mon, Mar 22, 2010 at 11:20 PM, Guy Roussin
<guy.roussin@xxxxxxxxxxxxxxxx> wrote:
> Hi,
>
> I'm a xen newbie and i try to configure xen (lenny),
>
> - Dom0 Boot On San (lenny 5.0.3 amd64)
> - DomU LV on clvm (openais)
>
> LM08q:/var/vm/scripts# xm list
> Name                                        ID   Mem VCPUs      State
> Time(s)
> Domain-0                                     0  1024     8     r-----
>  665.0
> xen-dmz-vm02                                     256     1
> 0.0
> xen-int-vm01                                 1   256     1     -b----
>  7.4
> xen-wif-vm03                                     256     1
> 0.0
>
> LM09q:/etc/xen# xm list
> Name                                        ID   Mem VCPUs      State
> Time(s)
> Domain-0                                     0  1024     8     r-----
> 1310.3
> xen-dmz-vm02                                 1   256     1     -b----
>  283.3
> xen-int-vm01                                     256     1
> 0.0
> xen-wif-vm03                                 3   256     1     -b----
>  2.0
>
> if i try to 'xm create xen-int-vm01.cfg' on LM09q i get this error :
> xm create xen-int-vm01.cfg
> Using config file "./xen-int-vm01.cfg".
> Error: VM name 'xen-int-vm01' already exists
>
> This is a good behavior i think.
>
> But, with virt-manager i can start xen-int-vm01 on LM09q
> so thereis 2 instances of the DomU sharing the same LV !!!

You misunderstood the commands.

First the basics: xen does a basic sanity check to prevent more than a
domU uses the same block device/file when it's set as writable, unless
user specifically overides it. The check is only on the same dom0.
Nothing is done to prevent the same device used on another dom0. You
need some other kind of external mechanism to prevent that.

Your original "xm create" command failed because the domU is already
defined, but not started. You can start it with "xm start", which
would produce the same result as starting it from virt-manager.

-- 
Fajar

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