Hypervisor summary shows incorrect total storage

[Alex Madama]

Fuel 5.1 (master-84)
Openstack deployment Centos, Multi-node with HA, Neutron with vlan, three nodes for Ceph OSD, ceph for ephemeral, images, block and object.

On Horizon UI in Admin/Hypervisors, Disk Usage shows incorrect value.
Since using Ceph for ephemeral storage it adds up the ceph storage seen in each storage node rather than just using the real amount of ceph storage.

[Timur Sufiev (tsufiev-x)]

To obtain all hypervisor statistics Horizon uses a single call at https://github.com/openstack/horizon/blob/2014.1.2/openstack_dashboard/api/nova.py#L678 which is in turn calling nova endpoint (https://github.com/openstack/python-novaclient/blob/2.18.1/novaclient/v1_1/hypervisors.py#L73). Thus it is Nova bug.

[Dmitry Mescheryakov (dmitrymex)]

The issue does not really break anything, hence lowering priority to medium. Also since we already reached soft code freeze for 5.1, I am bumping it to 6.0 release.

[Roman Podoliaka (rpodolyaka)]

I suggest that we add the following text to the known issues list:

When Ceph is used as a backend for ephemeral storage, in Horizon UI in Admin/Hypervisors Disk Usage shows incorrect value: it adds up the Ceph storage seen in each storage node rather than just using the real amount of ceph storage.

[Dmitry Borodaenko (angdraug)]

This is definitely not High priority, so shouldn't be targeted for 5.x.

[OSCI Robot (oscirobot)]

Package nova-2014.2-fuel6.0.mira10.git.b81d6b1.7f687ef has been built from changeset: https://review.fuel-infra.org/511
RPM Repository URL: http://osci-obs.vm.mirantis.net:82/centos-fuel-6.0-stable-511/centos

[OSCI Robot (oscirobot)]

Package nova-2014.2-fuel6.0~mira10+git.b81d6b1.7f687ef has been built from changeset: https://review.fuel-infra.org/511
DEB Repository URL: http://osci-obs.vm.mirantis.net:82/ubuntu-fuel-6.0-stable-511/ubuntu

[Dmitry Borodaenko (angdraug)]

High priority customer-found bug was marked a duplicate of this, raising priority to match.

[Roman Podoliaka (rpodolyaka)]

Should be added to release notes:

"Nova hypervisor stats (CLI - nova hypervisor-stats, Horizon - hypervisors page) report is misleading when shared storage backend (Ceph) is used: the actual amount of space available/used is multiplied by the number of compute nodes. Note, that this does not affect booting of instances in any way, but only confuses the operator checking the resources usage report."

[Nha Pham (phqnha)]

I think this bug is the same with
https://bugs.launchpad.net/nova/+bug/1252321

I have uploaded a patch:
https://review.openstack.org/#/c/155184/

[Dmitry Mescheryakov (dmitrymex)]

Too late to fix this in 6.0.1, moving to 6.0.2

[Sergey Nikitin (snikitin)]

Currently we have same bug in upstream https://bugs.launchpad.net/nova/+bug/1252321. But during review of the bug fix in upstream we couldn't find a right solution. So we need to create a spec in upstream with discussion to find a solution, because this is not a trivial problem.
But Kilo release is too close and we can't do it in Kilo. We have to move it to the Liberty.
Fuel release is close too, so we can't fix it in fuel 6.0.2 and 6.1 because if we fix it in mos, we will get a big difference between MOS and upstream code (because this bug is not trivial and maybe upstream bug fix will be rather different than our bug fix).

[Dmitry Mescheryakov (dmitrymex)]

The issue is targeted only to 7.0 because it requires significant efforts to fix. The work is currently done in upstream.

[Roman Podoliaka (rpodolyaka)]

We can't land this into Kilo upstream, Sergey to create a backlog ticket.

[Roman Podoliaka (rpodolyaka)]

Spec for Mitaka: https://review.openstack.org/225546

[Roman Podoliaka (rpodolyaka)]

^ means we can't do it earlier downstream, as neither we, nor upstream back port features.

[Mike Scherbakov (mihgen)]

We need to keep this open for 9.0 then, until we can provide a link to a patchset which closes this particular issue.

[Roman Podoliaka (rpodolyaka)]

Unfortunately, this will not land in Mitaka either: https://review.openstack.org/#/c/253187/