On 01/06/2015 03:56 AM, ppnaik 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
I think you meant free *disk* :)
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.
If you log into your SQL database for Nova and run the following query,
what does it say?
SELECT SUM(root_gb + ephemeral_gb) AS total_gb
FROM instances
WHERE node = $compute_node;
Replace $compute_node with the value of the compute node's
"hypervisor_hostname" field in the compute_nodes table.
Also, what is the value of your nova.conf instances_path option? From
looking at the above, it looks like you have /home partitioned to
contain most of the disk space, and / only has 49G available. If the
default instances_path value is used (/var/lib/nova/instances for
Debian-based systems, not sure about CentOS), then you will be using
that 49G / mount and not the 895G /home mount.
Best,
-jay
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