Re: [Xen-users] Why cannt I boot 128 ttylinux VMs?

[Miguel Araujo <maraujo@xxxxxxxxx>]

Liao, Guangdeng escribió:
> Hey all,
>
> I am a new Xen user and trying to boot up 128 VM on the machine with 16G
> memory. All VM images are ttylinux. When I booted up 116 Virtual
> machines, I can not boot VM anymore. Once I create a new VM, the latest
> VM on the machine would be kicked out to hold 116 VM simultaneously.
> Since I set VM memory to 32M, the Memory should not be an issue. I am
> wondering why I can not boot 128 VM and why the limit of VM is 116? Is
> there any way to configure the limit? I am looking forward to your help.
> Any suggestion or idea would be highly appreciated!
>
> I am using the latest xen 3.1 version and the configuration file for VM
> is as followings:
>
>         kernel = "/boot/vmlinuz-2.6.18-xen"
>       memory = 32
>       name = "ttylinux"
>       vif = [ 'bridge=xenbr0' ]
>       nics = 1
>       disk = ['file:/home/danny/guest-os/ttylinux/ttylinux-xen,sda1,w']
>       root = "/dev/sda1 ro"
>
>
> Thanks in advance
> Best,
> Guangdeng
>
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>   
I'm just wondering how much memory is the dom0 using. Have you the 
memory limited in the grub file? What flavor are you using for dom0?
It could be that the system can not free more memory, although I didn't 
know that XEN kicks out the last VM to make room for the new one, that 
doesn't seem usual.
On the other hand, if I'm not mistaken you are mounting your VMs on 
loopback devices. If that's the case have you done a "modprobe loop 
loop_max=255"?
Regards,
Miguel



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