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Btw, you can try adding the /home as the default disk and try.
To have /home as the default disk, you can use:
# echo "/dev/mapper/centos-home /home <fielsystem-type(like xfs or ext4)>
defaults 1 2" >> /etc/fstab
Regards,
Nitish B.

On Tue, Jan 6, 2015 at 5:59 PM, nithish B <bestofnithish at gmail.com> wrote:

> Hi Priyanka,
>     Can you please tell me the hypervisor that you are using?
>
> Thanks.
>
> Regards,
> Nitish B.
>
> On Tue, Jan 6, 2015 at 4:00 PM, ppnaik <ppnaik at cse.iitb.ac.in> wrote:
>
>> Thanks Nitish,
>>
>> The problem was it was taking disk from the /root partition which had
>> just 50 GB that is why it was overcommiting. Is there a way to ask it to
>> use the /home partition instead.
>>
>> Thanks
>>
>> Priyanka
>>
>>
>> On 2015-01-06 15:39, nithish B wrote:
>>
>>> Hi Priyanka,
>>>     The compute node has already been ballooned and over allocated to
>>> it's
>>> limit. To solve the issue, kindly add more disk to you compute host.
>>>
>>> Hope this helps.
>>>
>>> Thanks.
>>>
>>> Regards,
>>> Nitish B.
>>>
>>> On Tue, Jan 6, 2015 at 2:26 PM, ppnaik <ppnaik at cse.iitb.ac.in> wrote:
>>>
>>>  Hi All,
>>>> I have a multi node setup of openstack juno on centos 7. After I
>>>> instantiate multiple VMs and check the nova-compute.log on compute
>>>> nodes it
>>>> shows a negative value for free disks even though the the physical
>>>> system
>>>> has a lot of free memory
>>>>
>>>> on the physical system. df -h
>>>>
>>>> Filesystem               Size  Used Avail Use% Mounted on
>>>> /dev/mapper/centos-root   50G  2.0G   49G   4% /
>>>> devtmpfs                  16G     0   16G   0% /dev
>>>> tmpfs                     16G     0   16G   0% /dev/shm
>>>> tmpfs                     16G  281M   16G   2% /run
>>>> tmpfs                     16G     0   16G   0% /sys/fs/cgroup
>>>> /dev/mapper/centos-home  865G   33M  865G   1% /home
>>>> /dev/sda1                494M  137M  358M  28% /boot
>>>>
>>>> nova-compute.log on compute node:
>>>>
>>>> 2015-01-06 11:00:28.756 8123 AUDIT nova.compute.resource_tracker [-]
>>>> Total
>>>> physical ram (MB): 31911, total allocated virtual ram (MB): 17920
>>>> 2015-01-06 11:00:28.756 8123 AUDIT nova.compute.resource_tracker [-]
>>>> Free
>>>> disk (GB): -113
>>>> 2015-01-06 11:00:28.757 8123 AUDIT nova.compute.resource_tracker [-]
>>>> Total
>>>> usable vcpus: 16, total allocated vcpus: 10
>>>>
>>>> What is the issue and how can I resolve it? Please help.
>>>>
>>>> Thanks,
>>>>
>>>> Priyanka
>>>>
>>>>
>>>>
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>>>>
>
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