Re: [Xen-users] How to query the used space of a domU

[Pim van Riezen <pi+lists@xxxxxxxxxxxx>]

On Dec 17, 2007, at 21:01 , Dominique H. Schramm wrote:

> Hi folks,
>
> i use xen 3.1.0 from sources with debian eth. the space for
> the domU is a lvm volume.
>
> now i have a problem:
>
> how can i query the used space of a domU without logging
> into the domU ? with xm i didn't find out an option how to
> query this.
This information is not available to the hypervisor, it has no  
knowledge of the filesystem used by the domU. If the filesystem is  
ext2/ext3, you could query the logical volume in a read-only fashion,  
for instance by using something like "debugfs /dev/volgroup/volume -R  
stats | grep 'Free blocks'". I'm not an ext3 export to know for sure  
if this is advisable (funny in-between states of the filesystem while  
the guest is writing might emit nasal daemons if accessed by debugfs  
concurrently).
Generally speaking people leave this kind of monitoring to services  
like SNMP running on the guest.
Cheers,
Pim

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