Re: [Xen-users] weird domU sizes

[Brian Krusic <brian@xxxxxxxxxx>]

Hi Kai,

I'll try your suggestions.

How can I find out if my domU file is really a sparse file?

- Brian




On Jan 17, 2009, at 8:31 AM, Kai Schaetzl wrote:

> Brian Krusic wrote on Fri, 16 Jan 2009 17:50:59 -0800:
>
> > I've done more tests and have confirmed that wne I do a simple cp to
> > an nfs or local storage wether its ext3 or xfs, the size of the file
> > is roughly 1/3 of the size of that same file in its soruce dir of / 
> > var/
> > lib/xen/images.
> I have verified that a local copy of a sparse file on ext3 actually
> produces another sparse file. I may have had this wrong in memory  
> from the
> past. But I'm sure that under certain conditions I have seen that a  
> copy
> of a sparse file created a non-sparse file with the maximum size.
>
> Here is what you can do to test with sparse files without playing with
> your VM all the time:
>
> create an empty sparse file (this one will have 2 MB):
> dd if=/dev/zero of=test.img bs=1k seek=2048 count=1
>
> check "official" size:
> /home2/vm l test.img
> -rw-r--r-- 1 root root 2098176 Jan 17 16:34 test.img
>
> check real size on disk:
> /home2/vm du -s test.img
> 12      test.img
>
>
>
>
> Kai
>
> --
> Kai Schätzl, Berlin, Germany
> Get your web at Conactive Internet Services: http://www.conactive.com
>
>
>
>
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