Re: [Xen-users] Resizing file-based images

Tim Post
Sun, 03 Jun 2007 12:22:25 -0000

On Sun, 2007-06-03 at 10:07 +0000, john maclean wrote:
> Ah,
> Thanks for this. I''ve only been sticking to file-based images as
this
> is the only method that I can get working relatively quickly from a
> clean install.
>
> OK check this out:-
>  df -h
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/hda3             9.2G  3.3G  5.5G  37% /
> tmpfs                 502M     0  502M   0% /lib/init/rw
> udev                   10M   44K   10M   1% /dev
> tmpfs                 502M     0  502M   0% /dev/shm
> /dev/hda1              92M   31M   56M  36% /boot
> /dev/hda5              28G   18G  9.0G  66% /home
> /dev/hda6              72G   26G   42G  39% /vz # << Used for
file-based domUs

Ok, so did the available % of hda6 increase after you altered the file
images?

> If I had /dev/hda6 as LVM,
> a) Do I have something like :disk = [
''phy:/vz/alpha/bxvm.img,sda1,w'',
> ''phy:/vz/alpha/bxvm.swap,sda2,w'']?

I wouldn''t use a ''.'' in the names of the logical
volumes but yes that''s
pretty much it. I name mine so the name of the lv is meaningful, i.e.

/dev/shelf3/gnuxenlinux-xenu-sda1 , is the LV for sda1 for the dom-u
gnuxenlinux. Or you can even make symlinks to lv''s and specify just the
symlink if it makes it simpler.

> I''ve never been able to get the LVM''ed instances going
:-/
> Thanks alot for your time!

Hopefully you can get LVM working and all of this becomes much much
simpler.

Best,
--Tim

>
>
> On 03/06/07, Tim Post <tim.post@gridnix.org> wrote:
> > On Sun, 2007-06-03 at 02:34 +0000, john maclean wrote:
> > > Used the principles from here
http://jailtime.org/howto:filesystem to
> > > resize some file-based domUs. Everything''s Ok but
I''ve rebooted to a
> > > new kernel and notice that `ls -alh /path/to/images` still shows
the
> > > original sizes of the domUs.
> >
> > When you use a file backed BD (especially as a sparse file) it will
> > always claim the original size unless of course it becomes bigger.
This
> > does not mean that its the size LS is reporting it to be.
> >
> > Try looking at the output of ''du -h'' noticing the
partition containing
> > the file backed BD''s then compare it with the output of ls.
> >
> > I really recommend using LVM over file backed block devices unless
your
> > in a position where you just can''t use LVM.
> >
> > >
> > > What gives?
> > >
> >
> > You are user 1,798,782,947,153,827,301 to be confused by this. Reality
> > has not changed, your computer has not developed a drug habit, this is
> > not a dream.
> >
> > Best,
> > --Tim
> >
> >
>
>