Xen users - Feb 2008 - Reg Disk space in guest domain with fedora img

Hi
I had installed Xen-3.0.4 in Scientific linux 4 (kernel version 2.6.16.33)
by following the instructions given in following link

project-xen.web.cern.ch/project-xen/xen/howto_slcXen.html

I ve created the guest Domain with fedora image of size 2.2GB , disk space
as 10GB  and the domain started successfully . when i logged into the xm
console and checked the disk space its showing only 2.2GB .. is there any
thing worng with my configuration ??

Here''s my configruation file which i ve used to create domain

cat /usr/local/vm_creator/workspace/images/fedora

#This Configuration file is Automatically Generated on Tue Feb 12 19:33:17
IST 2008
kernel = "/boot/vmlinuz-2.6.16.33-xen"
memory = 256
extra = "fastboot"
ramdisk = "/boot/initrd-2.6.16.33-xen.img"
disk =
[''phy:vg/fedora,sda6,w'',''phy:vg/compswap,sda7,w'',
''phy:vg/modules,sda5,r'']
name = "fedora.compnode.grid"
root = "/dev/sda6 ro"
vif=[''bridge=xenbr0'']

The logical volumes look like

[root@g40 ~]# lvs
  LV       VG   Attr   LSize   Origin Snap%  Move Copy%
  compswap vg   -wi-ao   1.00G
  fedora   vg   -wi-ao  10.00G
  modules  vg   -wi-ao 100.00M

In the guest domain when i checked the following commands i got the output
as

[root@fedora ~]# df -H
Filesystem             Size   Used  Avail Use% Mounted on
/dev/sda6              2.2G   904M   1.2G  46% /
none                   135M      0   135M   0% /dev/shm
/dev/sda5              102M    90M   7.2M  93% /lib/modules

[root@fedora ~]# fdisk -l

Disk /dev/sda7: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sda7 doesn''t contain a valid partition table

Disk /dev/sda6: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sda6 doesn''t contain a valid partition table

Disk /dev/sda5: 104 MB, 104857600 bytes
255 heads, 63 sectors/track, 12 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sda5 doesn''t contain a valid partition table



[root@fedora ~]# cat /etc/fstab
# This file is edited by fstab-sync - see ''man fstab-sync'' for
details
/dev/sda6               /                       ext3    defaults 1 1
none                    /dev/pts                devpts  gid=5,mode=620 0 0
none                    /dev/shm                tmpfs   defaults 0 0
none                    /proc                   proc    defaults 0 0
none                    /sys                    sysfs   defaults 0 0
/dev/sda7       swap    swap    defaults        0 0
/dev/sda5       /lib/modules    ext2    defaults        0 1

Is there any thing to be configured to get the full disk space as 10GB or
any thing wrong with my configuration ??

Please help me

Thanks in advance

Rajiv

Project Associate ,

CARE,MIT,Annauniversity ,Chennai


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Hi,

On Feb 12, 2008 11:47 AM, Rajiv Rajaian <rajiv.grid@gmail.com>
wrote:
> Hi
> I had installed Xen-3.0.4 in Scientific linux 4 (kernel version 2.6.16.33)
> by following the instructions given in following link
>
> project-xen.web.cern.ch/project-xen/xen/howto_slcXen.html
>
> I ve created the guest Domain with fedora image of size 2.2GB , disk space
> as 10GB  and the domain started successfully . when i logged into the xm
> console and checked the disk space its showing only 2.2GB .. is there any
> thing worng with my configuration ??
>
> Here''s my configruation file which i ve used to create domain
>
>
> cat /usr/local/vm_creator/workspace/images/fedora
>
> #This Configuration file is Automatically Generated on Tue Feb 12 19:33:17
> IST 2008
> kernel = "/boot/vmlinuz-2.6.16.33-xen"
> memory = 256
> extra = "fastboot"
> ramdisk = "/boot/initrd-2.6.16.33-xen.img"
>  disk =
[''phy:vg/fedora,sda6,w'',''phy:vg/compswap,sda7,w'',
> ''phy:vg/modules,sda5,r'']
> name = "fedora.compnode.grid"
> root = "/dev/sda6 ro"
> vif=[''bridge=xenbr0'']
>
> The logical volumes look like
>
> [root@g40 ~]# lvs
>   LV       VG   Attr   LSize   Origin Snap%  Move Copy%
>   compswap vg   -wi-ao   1.00G
>   fedora   vg   -wi-ao  10.00G
>   modules  vg   -wi-ao 100.00M
>
> In the guest domain when i checked the following commands i got the output
> as
>
> [root@fedora ~]# df -H
> Filesystem             Size   Used  Avail Use% Mounted on
> /dev/sda6              2.2G   904M   1.2G  46% /
> none                   135M      0   135M   0% /dev/shm
> /dev/sda5              102M    90M   7.2M  93% /lib/modules
>
>
> [root@fedora ~]# fdisk -l
>
> Disk /dev/sda7: 1073 MB, 1073741824 bytes
> 255 heads, 63 sectors/track, 130 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Disk /dev/sda7 doesn''t contain a valid partition table
>
> Disk /dev/sda6: 10.7 GB, 10737418240 bytes
> 255 heads, 63 sectors/track, 1305 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Disk /dev/sda6 doesn''t contain a valid partition table
>
> Disk /dev/sda5: 104 MB, 104857600 bytes
> 255 heads, 63 sectors/track, 12 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Disk /dev/sda5 doesn''t contain a valid partition table
>
>
This output is the one that seems strange to me. fdisk things that the
partitions are hard drives for some reason.

My guess is that there is something wrong with the logical volume.

I would suggest to stop the guest and mount the fedora logical volume
manually. See if the right size then. If not then it is a problem with
how Xen is recognizing it.

Regards,
Todd



>
> [root@fedora ~]# cat /etc/fstab
> # This file is edited by fstab-sync - see ''man
fstab-sync'' for details
> /dev/sda6               /                       ext3    defaults 1 1
> none                    /dev/pts                devpts  gid=5,mode=620 0 0
>  none                    /dev/shm                tmpfs   defaults 0 0
> none                    /proc                   proc    defaults 0 0
> none                    /sys                    sysfs   defaults 0 0
> /dev/sda7       swap    swap    defaults        0 0
>  /dev/sda5       /lib/modules    ext2    defaults        0 1
>
>
> Is there any thing to be configured to get the full disk space as 10GB or
> any thing wrong with my configuration ??
>
> Please help me
>
> Thanks in advance
>
> Rajiv
>
> Project Associate ,
>
> CARE,MIT,Annauniversity ,Chennai
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>
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Hi Rajiv,

You should keep replies to the list as others may have insights that I
don''t know about.

I think I might notice something though...

On Feb 13, 2008 1:53 AM, Rajiv Rajaian <rajiv.grid@gmail.com>
wrote:
> Hi Todd
>
> These are the steps I''d used to create the fedora domain
> lvcreate -L10G -n compnode vg
> cat fedora.img > /dev/vg/fedora
>
What is fedora.img?

if fedora fedora.img is a file acting as a partition (or disk) than
that may be the problem.

You would need to use the resize2fs command (or a similar command
based on the file system type of the fedora.img) that you mention
below.

The size of the partition needs to match the 10G that you are using
for the logical volume.

It depends on how fedora.img was created as to how to work with it.

The two cases as stated above are:

1) It''s a partition image (or in other words simply a file system)

In this case, the best bet to get the resize to work is to first make
sure it isn''t in use and not mounted. Then do something like:

resize2fs fedora.img 10G (you may also need the -F option, since it is
not actually a file system partition, but a file representing one)

2) It''s a disk image

losetup -f

losetup `losetup -f` fedora.img
kpartx -av /dev/loopX  <-- replace X with the appropriate number from
losetup -f output above
fdisk -l /dev/mapper/loopX
resize2fs /dev/mapper/loopXpY 10G <-- replace Y with appropriate
number from fdisk -l output (resize command changes if file system is
not ext2 or ext3

a similar process is documented in [1]

If you don''t know if you fall into case 1 or 2, then you have two ways
to check

1) fdisk -l fedora.img (is there partitions?)

2) mount -o loop fedora.img /mnt/temp
be sure to umount /mnt/temp before resizing etc.

Hope that helps.

Best regards,
Todd

[1] http://docs.cosi/wiki/Resizing_an_Image
> Also i found one commad to resize2fs
> resize2fs /dev/vg/fedora
>  Is this step has to done or optional
>
> Now i ve seen the lvm size of created domain as 10GB with lvdisplay command
>
> [root@g40 vm_creator]# lvdisplay /dev/vg/fedora
>   --- Logical volume ---
>   LV Name                /dev/vg/fedora
>    VG Name                vg
>   LV UUID                MwIi5u-kZRD-q4co-8imB-i9cf-PvuO-cO3fI5
>   LV Write Access        read/write
>   LV Status              available
>   # open                 1
>   LV Size                10.00 GB
>    Current LE             2560
>   Segments               1
>   Allocation             inherit
>   Read ahead sectors     0
>   Block device           253:0
>
> In my xm config file disk option given by me was
>
>
>  disk =
[''phy:vg/fedora,sda6,w'',''phy:vg/compswap,sda7,w'',
> ''phy:vg/modules,sda5,r'']
>
> Also the size of the feora image ive used is
> [root@g40 images]# ls -ls fedora.img
> 2100232 -rw-r--r--  1 root root 2148532224 Feb 12 12:06 fedora.img
>
> Only this disk space is shown in df -H command inside the created domain
>
>  df -H
> Filesystem             Size   Used  Avail Use% Mounted on
> /dev/sda6              2.2G   904M   1.2G  46% /
>
> Whether it will show this disk size as 2GB only or it will show 10GB as my
> lvdisplay shows
>
> Fdisk command shows like this
>
> Disk /dev/sda6: 10.7 GB, 10737418240 bytes
>
> 255 heads, 63 sectors/track, 1305 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Disk /dev/sda6 doesn''t contain a valid partition table
>
> Is this an error ??? Im getting little bit confused..
>
> Thanks in advanced
>
> Rajiv
> Project Associate
> CARE,MIT
> Anna University
>
>
>
>
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On Feb 13, 2008 9:56 AM, Rajiv Rajaian <rajiv.grid@gmail.com>
wrote:
> Thanks Todd
> I d manually mounted my /dev/vg/fedora before copying the
> fedora.img(bootable image)
> Total size shows 10GB
> And after copying the image it shows only 2.2GB
> Now i need to resize the lvm.. But  my host os(Scientific linux )
> doesn''t have resize2fs command ..
> Also my the filesystem type is ext3...How to resize the ext3 filesystem.
>
http://e2fsprogs.sourceforge.net/

>
> Thanks in Advance
> Rajiv
>
>
> On 2/13/08, Todd Deshane <deshantm@gmail.com> wrote:
> > Hi Rajiv,
> >
> > You should keep replies to the list as others may have insights that I
> > don''t know about.
> >
> > I think I might notice something though...
> >
> > On Feb 13, 2008 1:53 AM, Rajiv Rajaian <rajiv.grid@gmail.com>
wrote:
> > > Hi Todd
> > >
> > > These are the steps I''d used to create the fedora domain
> > > lvcreate -L10G -n compnode vg
> > > cat fedora.img > /dev/vg/fedora
> > >
> >
> > What is fedora.img?
> >
> > if fedora fedora.img is a file acting as a partition (or disk) than
> > that may be the problem.
> >
> > You would need to use the resize2fs command (or a similar command
> > based on the file system type of the fedora.img) that you mention
> > below.
> >
> > The size of the partition needs to match the 10G that you are using
> > for the logical volume.
> >
> > It depends on how fedora.img was created as to how to work with it.
> >
> > The two cases as stated above are:
> >
> > 1) It''s a partition image (or in other words simply a file
system)
> >
> > In this case, the best bet to get the resize to work is to first make
> > sure it isn''t in use and not mounted. Then do something like:
> >
> > resize2fs fedora.img 10G (you may also need the -F option, since it is
> > not actually a file system partition, but a file representing one)
> >
> > 2) It''s a disk image
> >
> > losetup -f
> >
> > losetup `losetup -f` fedora.img
> > kpartx -av /dev/loopX  <-- replace X with the appropriate number
from
> > losetup -f output above
> > fdisk -l /dev/mapper/loopX
> > resize2fs /dev/mapper/loopXpY 10G <-- replace Y with appropriate
> > number from fdisk -l output (resize command changes if file system is
> > not ext2 or ext3
> >
> > a similar process is documented in [1]
> >
> > If you don''t know if you fall into case 1 or 2, then you have
two ways to
> > check
> >
> > 1) fdisk -l fedora.img (is there partitions?)
> >
> > 2) mount -o loop fedora.img /mnt/temp
> > be sure to umount /mnt/temp before resizing etc.
> >
> > Hope that helps.
> >
> > Best regards,
> > Todd
> >
> > [1] http://docs.cosi/wiki/Resizing_an_Image
> >
> > > Also i found one commad to resize2fs
> > > resize2fs /dev/vg/fedora
> > >  Is this step has to done or optional
> > >
> > > Now i ve seen the lvm size of created domain as 10GB with
lvdisplay
> > command
> > >
> > > [root@g40 vm_creator]# lvdisplay /dev/vg/fedora
> > >   --- Logical volume ---
> > >   LV Name                /dev/vg/fedora
> > >    VG Name                vg
> > >   LV UUID                MwIi5u-kZRD-q4co-8imB-i9cf-PvuO-cO3fI5
> > >   LV Write Access        read/write
> > >   LV Status              available
> > >   # open                 1
> > >   LV Size                10.00 GB
> > >    Current LE             2560
> > >   Segments               1
> > >   Allocation             inherit
> > >   Read ahead sectors     0
> > >   Block device           253:0
> > >
> > > In my xm config file disk option given by me was
> > >
> > >
> > >  disk =
[''phy:vg/fedora,sda6,w'',''phy:vg/compswap,sda7,w'',
> > > ''phy:vg/modules,sda5,r'']
> > >
> > > Also the size of the feora image ive used is
> > > [root@g40 images]# ls -ls fedora.img
> > > 2100232 -rw-r--r--  1 root root 2148532224 Feb 12 12:06
fedora.img
> > >
> > > Only this disk space is shown in df -H command inside the created
domain
> > >
> > >  df -H
> > > Filesystem             Size   Used  Avail Use% Mounted on
> > > /dev/sda6              2.2G   904M   1.2G  46% /
> > >
> > > Whether it will show this disk size as 2GB only or it will show
10GB as my
> > > lvdisplay shows
> > >
> > > Fdisk command shows like this
> > >
> > > Disk /dev/sda6: 10.7 GB, 10737418240 bytes
> > >
> > > 255 heads, 63 sectors/track, 1305 cylinders
> > > Units = cylinders of 16065 * 512 = 8225280 bytes
> > >
> > > Disk /dev/sda6 doesn''t contain a valid partition table
> > >
> > > Is this an error ??? Im getting little bit confused..
> > >
> > > Thanks in advanced
> > >
> > > Rajiv
> > > Project Associate
> > > CARE,MIT
> > > Anna University
> > >
> > >
> > >
> > >
> >
>
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Sorted out the issue of lvm size in guest domain.
Steps I have  done are as follows
lvcreate -L10G -n fedora vg
mkfs.ext3 /dev/vg/fedora
cat fedora.img >/dev/vg/fedora
mount /de/vg/fedora  /mnt/tmp

df -H /mnt/tmp
Filesystem                      Size   Used  Avail Use% Mounted on
/dev/mapper/vg-fedora     2.2G   2.0G    82M  96% /mnt/tmp

Now i ve resized the lvm using the command

resize2fs -f /dev/vg/fedora

Afer resizing the lvm size looks like this df -H /mnt/tmp
Filesystem                  Size   Used  Avail Use% Mounted on
/dev/mapper/vg-fedora  11G   2.2G   8.0G  22% /mnt/tmp

Also Inside the guest domain the disk usage shows
[root@fedora ~]# df -H
Filesystem             Size   Used  Avail Use% Mounted on
/dev/sda6               11G   2.2G   8.0G  22% /
none                     135M      0   135M   0% /dev/shm
/dev/sda5              102M    90M   7.2M  93% /lib/modules



Thanks to Todd and Xen users list

Thanks
Rajiv
Project Associate ,
CARE ,MIT,Anna University


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