Re: [Xen-users] File system layout

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

Mark Williamson wrote:
> > My supervisor wants to create a LV then give that to a VM and then
> > create a VG with LV's under it inside the VM. I have read on the list
> > where this will give bad performance inside the VM.
> >     
> It won't necessarily give *bad* performance but doing the two layers of 
> translation is a bit unfortunate.
>   
An email from Sadique on this list sometime early this year said LVM has 2%
performance hit over pysical partitions. So using LVM on both dom0 and 
domU (roughly) reduce performance by 4%.
> To me, the simplicity of doing all LVM management in dom0 and hiding it from 
> the guest appeals.  
> It's 
> actually possible to pass separate LVM volumes to appear as individual 
> partitions in the guest - this has the advantage that there's no MS-DOS 
> partition table to worry about, just a load of linear LVs with filesystems 
> on.
>   
I second that. That is what we do for Linux PV guests.

Regards,

Fajar

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