[one-users] Lustre + qemu/kvm issue

[Danny Sternkopf]

Hi,

I wonder if there is anyone out there who has a working test or even 
production environment using Lustre for VM disk images? It is always 
mentioned when talking about shared storage and transfer managers in 
OpenNebula, even in the quite recent survey from C12G.

I run into the Lustre Direct I/O problematic which requires the 
application to read and write in 4K I/O chunks. qemu/kvm uses 512 byte 
as I/O size and refuses to start the VM. In this case cache is "none". 
If I change the cache to writethrough (default) then the VM stored on 
Lustre can be started, but it has very poor write performance. 
(100-times worse) I think Gluster has similar issues, but I didn't find 
any hints for Lustre. Any comments?

Best regards,

Danny

On 2012-02-16 16:08, Rui Ramos wrote:
> Hi there,
>
>    Is anyone using OpenNebula with Lustre as shared file-system ? any thoughts if this could be a good approach ?
>
> Best Regards, Rui
> --
> Rui Ramos
> Universidade do Porto
> Administração de Sistemas e Computação
>
> T: +351 220408164
> E: rramos at reit.up.pt : PGP<http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBD6E4746DD9D3592>
>
>
>
>