nova-scheduler fails schedule an instance with odd number of pinned vCPU's
Issue
I have an issue after configuring CPU isolation and pinning on a test platform.
- The compute has 32 CPU's per host from which 24 have been isolated and configured as
vcpu_pin_setinnova.confof the compute host:
vcpu_pin_set=2,18,10,26,3,19,11,27,4,20,12,28,5,21,13,29,6,22,14,30,7,23,15,31
Also isolated them in grub config to be not used by the system.
- created a flavor to use 11 vCPUs:
nova flavor-create mytest auto 8192 0 11
nova flavor-key mytest set hw:cpu_policy=dedicated
- finally boot an instance:
nova boot --flavor mytest --image cirros --availability-zone zone1 myVM
- Result
"No valid host was found. There are not enough hosts available.":
# nova show c0f12248-68c2-42e8-b4b4-cfcbcc19b254
+--------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Property | Value |
+--------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| OS-DCF:diskConfig | MANUAL |
| OS-EXT-AZ:availability_zone | zone1 |
| OS-EXT-SRV-ATTR:host | - |
| OS-EXT-SRV-ATTR:hypervisor_hostname | - |
| OS-EXT-SRV-ATTR:instance_name | instance-0000002e |
| OS-EXT-STS:power_state | 0 |
| OS-EXT-STS:task_state | - |
| OS-EXT-STS:vm_state | error |
| OS-SRV-USG:launched_at | - |
| OS-SRV-USG:terminated_at | - |
| accessIPv4 | |
| accessIPv6 | |
| config_drive | |
| created | 2016-06-01T07:22:57Z |
| fault | {"message": "No valid host was found. There are not enough hosts available.", "code": 500, "details": " File \"/usr/lib/python2.7/site-packages/nova/conductor/manager.py\", line 671, in build_instances |
| | request_spec, filter_properties) |
| | File \"/usr/lib/python2.7/site-packages/nova/scheduler/utils.py\", line 337, in wrapped |
| | return func(*args, **kwargs) |
| | File \"/usr/lib/python2.7/site-packages/nova/scheduler/client/__init__.py\", line 52, in select_destinations |
| | context, request_spec, filter_properties) |
| | File \"/usr/lib/python2.7/site-packages/nova/scheduler/client/__init__.py\", line 37, in __run_method |
| | return getattr(self.instance, __name)(*args, **kwargs) |
| | File \"/usr/lib/python2.7/site-packages/nova/scheduler/client/query.py\", line 34, in select_destinations |
| | context, request_spec, filter_properties) |
| | File \"/usr/lib/python2.7/site-packages/nova/scheduler/rpcapi.py\", line 120, in select_destinations |
| | request_spec=request_spec, filter_properties=filter_properties) |
| | File \"/usr/lib/python2.7/site-packages/oslo_messaging/rpc/client.py\", line 156, in call |
| | retry=self.retry) |
| | File \"/usr/lib/python2.7/site-packages/oslo_messaging/transport.py\", line 90, in _send |
| | timeout=timeout, retry=retry) |
| | File \"/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py\", line 350, in send |
| | retry=retry) |
| | File \"/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py\", line 341, in _send |
| | raise result |
| | ", "created": "2016-06-01T07:22:57Z"} |
| flavor | mytest (5e992e63-a277-4e31-9b55-6c9a937fd5e3) |
| hostId | |
| id | c0f12248-68c2-42e8-b4b4-cfcbcc19b254 |
| image | cirros (b646c75d-fc4e-4803-b353-f534ca20c38c) |
| key_name | - |
| metadata | {} |
| name | myVM |
| os-extended-volumes:volumes_attached | [] |
| status | ERROR |
| tenant_id | 7893a743d02f4c6a9879c42f20ef6943 |
| updated | 2016-06-01T07:22:57Z |
| user_id | 6825ae4da59a40d79f34faa95b5eb0a2 |
+--------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
- The same works with an even number of vCPUs
Environment
- Red Hat OpenStack Platform 7.0
- nova <
openstack-nova-2015.1.2-18.el7ost
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