Xen users - Apr 2009 - Guest says: no space left on device; but thats not true

Hello,

running a Gentoo host and several guests (Xen 3.3.0, Gentoo 
linux-2.6.18-xen-r12) there are some disk space spooks.

The guest config files are looking like this:
-----
kernel = "/mnt/xen/kernel-2.6.18-xen-r12"
memory = 512
name   = "plone"
disk   = [''file:/mnt/xen/plone.img,sda1,w'']
root   = "/dev/sda1 ro"
cpu    = 1
extra  = "xencons=tty"
vif    = [ ''vifname=veth4'' ]
-----
The vif parameter incremets from one guest to the next in the config 
files and each guest have its own disk image.

All guests use the same domU-kernel, also a linux-2.6.18-xen-r12, build 
as guest kernel.

Every guest has its own image file to run from. Some guests are very 
happy with this.

Other guests seem not to have access to all their disk space:
-----
plone ~ # df . -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1             4.0G  2.0G  1.9G  52% /
plone ~ # touch test
touch: cannot touch `test'': No space left on device
-----

The space is formatted in ext3 and if i mount the filesystem loopback in 
the dom0 (after shutting down the guest), the whole space is usable.

For instance, a guest on the same host:
-----
adappro install # df . -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1             4.0G  3.7G   51M  99% /
adappro install # touch test
adappro install # ll test
-rw-r--r-- 1 root root 0 Apr  8 12:54 test
-----

The config file for the fine running host:
-----
kernel = "/mnt/xen/kernel-2.6.18-xen-r12"
memory = 512
name   = "adappro"
disk   = [''file:/mnt/xen/adappro.img,sda1,w'']
root   = "/dev/sda1 ro"
cpu    = 2
extra  = "xencons=tty"
vif    = [ ''vifname=veth2'' ]
-----

The images are replicated via filecopy from a working guest filesystem. 
  For sure the guest has been shutdown before replicating the file.
fsck.ext3 -f runs without issues on the images.

Any idea what i''am missing?

Best regards
   Olaf

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On Wed, Apr 8, 2009 at 5:22 PM, Olaf Krause <krause@okit.de>
wrote:
> Hello,
>
> running a Gentoo host and several guests (Xen 3.3.0, Gentoo
> linux-2.6.18-xen-r12) there are some disk space spooks.
>
> Other guests seem not to have access to all their disk space:
> -----
> plone ~ # df . -h
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sda1             4.0G  2.0G  1.9G  52% /
> plone ~ # touch test
> touch: cannot touch `test'': No space left on device
> -----
>
> The space is formatted in ext3 and if i mount the filesystem loopback in
the
> dom0 (after shutting down the guest), the whole space is usable.
Are you SURE that if you mount that particular filesystem in dom0 the
space is usable?
At first look it seems you might be out of inodes. Try a "df -i".

Regards.

Fajar

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On Wed, Apr 8, 2009 at 6:22 AM, Olaf Krause <krause@okit.de>
wrote:
> Hello,
>
> running a Gentoo host and several guests (Xen 3.3.0, Gentoo
> linux-2.6.18-xen-r12) there are some disk space spooks.
Another thought...

How many DomUs do you have on your host filesystem?  What are their
sizes?  And more importantly, are you using sparse files for all the
DomU images??

If you have, say 20GB of storage for DomUs and you have 5 domUs using
sparse file images of 5GB each, you will run out of space, even though
the guest thinks it still has plenty left...

I''ve run into issues like this before on test systems when
over-committing disk space with sparse files.

Also, what does the full disk image look like for each guest?  Do
those numbers take into account swap partitions created by the DomU
installation?  That can be another problem...

Anyway, just a couple other thoughts on the problem...

Cheers
Jeff

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Thank you!

Shame on me!

I did the test with some few big files.
The inodes went so low, the booting Linux acquired the the rest.

Now i made a backup and created a new image with more inodes. 256k 
(262144) seems to be the default value. Now I use by hand:
   mkfs.ext3 -N 1048567 -b 1024 $NEW_IMAGE

...and the guest runs fine.

Best regards
   Olaf

Fajar A. Nugraha schrieb:
> On Wed, Apr 8, 2009 at 5:22 PM, Olaf Krause <krause@okit.de> wrote:
>> Hello,
>>
>> running a Gentoo host and several guests (Xen 3.3.0, Gentoo
>> linux-2.6.18-xen-r12) there are some disk space spooks.
>>
> 
>> Other guests seem not to have access to all their disk space:
>> -----
>> plone ~ # df . -h
>> Filesystem            Size  Used Avail Use% Mounted on
>> /dev/sda1             4.0G  2.0G  1.9G  52% /
>> plone ~ # touch test
>> touch: cannot touch `test'': No space left on device
>> -----
>>
>> The space is formatted in ext3 and if i mount the filesystem loopback
in the
>> dom0 (after shutting down the guest), the whole space is usable.
> 
> Are you SURE that if you mount that particular filesystem in dom0 the
> space is usable?
> At first look it seems you might be out of inodes. Try a "df -i".
> 
> Regards.
> 
> Fajar

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Hi ,

 	I am able to create ubuntu guest using xen-create-image. The
guest OS is working on SUSE 11. I am able to successfully login into
guest. But if I create guest os on Oracle VM. I am unable to login. Dom
u on running condition. It gives login incorrect error inspite of giving
right password. Please help us to resolve the issue.

Regards
Marimuthu

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