RE: [Xen-devel] how to see the data changing in a running domain?

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> I wonder how I can see the (on-disk) data changing in a running
> domainU. I tried to do it, but the data looking from outside remains
> intact, no matter what I modified inside the domainU.

Use NFS root, otherwise the caching (in both kernels) will stop you
seeing what's going on.

An alternative is to use GFS or OCFS2.

Ian
 
> I did it this way: I use a file-based rootfs (got from ttylinux), and
> created a domainU on that rootfs. Everything was fine. Then from
> domain0, I mounted that "rootfs" file in read-only mode, with this
> command: "mount -o loop -o ro rootfs /mnt". After that I could see the
> data inside the rootfs.
> 
> Then I suppose that from outside (domain0), I can watch for the data
> of domainU changing in realtime. To test, I just did a comand like
> this from inside domainU: "ls /etc > /root/etclist", and created a
> "etclist" in "/root". Then I supposed that from domain0, in a mounted
> "/mnt" above, I could see the new file created as "/mnt/root/etclist",
> but I was disappointed not to see anything at all.
> 
> So clearly everything made changed inside domainU cannot be seen from
> outside (domain0). Anybody can please explain to me why, and if
> possible, how could I watch data of domainU (in realtime) from
> domain0?
> 
> Thank you a lot,
> AQ
> 
> 
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