Hi,

We are using RHEL7.1 OSP7 distribution which is based on Kilo with Ironic driver for power management. Deployer is TripleO based RDO manager. We see following error on nova-conductor logs -

2015-06-19 17:17:48.272 4988 WARNING nova.scheduler.utils [req-9d33461b-63b1-4555-b4a9-eff98428c3dc e27ab3751f7f4a4e9f3b030d48b0f366 0db82411bf7a4d4fba49b39d7b5aef2d - - -] Failed to compute_task_build_instances: No valid host was found. There are not enough hosts available.
Traceback (most recent call last):

  File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 142, in inner
    return func(*args, **kwargs)

  File "/usr/lib/python2.7/site-packages/nova/scheduler/manager.py", line 86, in select_destinations
    filter_properties)

  File "/usr/lib/python2.7/site-packages/nova/scheduler/filter_scheduler.py", line 80, in select_destinations
    raise exception.NoValidHost(reason=reason)

NoValidHost: No valid host was found. There are not enough hosts available.

We have modified nova.virt.driver for ironic as below -

#compute_driver=libvirt.LibvirtDriver
compute_driver=nova.virt.ironic.IronicDriver <<<<<<<<<<<

Since we are using our own 'pxe_ucs' driver back ported from Liberty release for kilo, as h/w is Cisco UCS -

#enabled_drivers=pxe_ipmitool
enabled_drivers=pxe_ucs,agent_ucs <<<<<<<<<<<

Below are the some of log outputs -

[stack@ospd ~]$ ironic node-list
+--------------------------------------+------+---------------+-------------+-----------------+-------------+
| UUID                                 | Name | Instance UUID | Power State | Provision State | Maintenance |
+--------------------------------------+------+---------------+-------------+-----------------+-------------+
| 2208c498-5989-447c-8a77-b6761e3d3cda | None | None          | power off   | available       | False       |
| cb21453a-dfe4-423c-9a9f-91504a230923 | None | None          | power off   | available       | False       |
+--------------------------------------+------+---------------+-------------+-----------------+-------------+
[stack@ospd ~]$ nova list
+--------------------------------------+-------------------------------------------------------+--------+------------+-------------+----------+
| ID                                   | Name                                                  | Status | Task State | Power State | Networks |
+--------------------------------------+-------------------------------------------------------+--------+------------+-------------+----------+
| 2dbaf0d1-4874-4b07-9fe2-29d4987487ac | ov-gqf22wdaft-0-5zueofadpzlb-NovaCompute-hinuwoq3yq7q | ERROR  | -          | NOSTATE     |          |
| 1ba2abb0-f188-4f06-bbc5-14de8f111534 | ov-rimjhocbgyt-0-bwbyuxfori6h-Controller-aah6uu3r7v3e | ERROR  | -          | NOSTATE     |          |
+--------------------------------------+-------------------------------------------------------+--------+------------+-------------+----------+
[stack@ospd ~]$ nova flavor-list
+--------------------------------------+-----------+-----------+------+-----------+------+-------+-------------+-----------+
| ID                                   | Name      | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
+--------------------------------------+-----------+-----------+------+-----------+------+-------+-------------+-----------+
| fabc50be-3c0b-45b2-84a9-bf78607b3cc3 | baremetal | 4096      | 40   | 0         |      | 1     | 1.0         | True      |
+———————————————————+-----------+-----------+------+-----------+------+-------+-------------+-----------+

[stack@ospd ~]$ nova hypervisor-list
+----+--------------------------------------+-------+---------+
| ID | Hypervisor hostname                  | State | Status  |
+----+--------------------------------------+-------+---------+
| 11 | 2208c498-5989-447c-8a77-b6761e3d3cda | up    | enabled |
| 12 | cb21453a-dfe4-423c-9a9f-91504a230923 | up    | enabled |
+----+--------------------------------------+-------+---------+
[stack@ospd ~]$ nova hypervisor-stats
+----------------------+--------+
| Property             | Value  |
+----------------------+--------+
| count                | 2      |
| current_workload     | 0      |
| disk_available_least | 370    |
| free_disk_gb         | 370    |
| free_ram_mb          | 229376 |
| local_gb             | 370    |
| local_gb_used        | 0      |
| memory_mb            | 229376 |
| memory_mb_used       | 0      |
| running_vms          | 0      |
| vcpus                | 56     |
| vcpus_used           | 0      |
+———————————+--------+

[stack@ospd ~]$ glance image-list
+--------------------------------------+------------------------+-------------+------------------+-----------+--------+
| ID                                   | Name                   | Disk Format | Container Format | Size      | Status |
+--------------------------------------+------------------------+-------------+------------------+-----------+--------+
| a85703cd-b6a6-4366-b3a6-4e5de420fb98 | bm-deploy-kernel       | aki         | aki              | 5027392   | active |
| 28cff74d-4cd6-421b-97a8-a044a114069b | bm-deploy-ramdisk      | ari         | ari              | 56310758  | active |
| 8f0604bd-a20a-4df2-83be-290a99138f13 | overcloud-full         | qcow2       | bare             | 893856256 | active |
| 5936b7a3-fdf1-4723-95eb-3ea261995cc5 | overcloud-full-initrd  | ari         | ari              | 36758352  | active |
| 3a999b85-fc53-48c8-b6ec-89e5fa3a0aa9 | overcloud-full-vmlinuz | aki         | aki              | 5027392   | active |
+———————————————————+------------------------+-------------+------------------+-----------+--------+

[stack@ospd ~]$ instack-ironic-deployment --show-profile
Preparing for deployment...
  Querying assigned profiles ...

    2208c498-5989-447c-8a77-b6761e3d3cda
      "boot_option=local"

    cb21453a-dfe4-423c-9a9f-91504a230923
      "boot_option=local"


  DONE.

Prepared.

[stack@ospd ~]$ heat stack-list
+--------------------------------------+------------+---------------+----------------------+
| id                                   | stack_name | stack_status  | creation_time        |
+--------------------------------------+------------+---------------+----------------------+
| a0cf5344-ae2f-44bc-b5dc-85d467f61a6e | overcloud  | CREATE_FAILED | 2015-06-19T11:56:26Z |  
+———————————————————+——————+---------------+----------------------+

[stack@ospd ~]$ tuskar plan-show-scale overcloud
+------------------+-------+
| Property         | Value |
+------------------+-------+
| Ceph-Storage-1   | 0     |
| Cinder-Storage-1 | 0     |
| Compute-1        | 1     |
| Controller-1     | 1     |
| Swift-Storage-1  | 0     |
+—————————+-------+

[stack@ospd ~]$ tuskar plan-show-flavors overcloud
+------------------+-----------+
| Property         | Value     |
+------------------+-----------+
| Ceph-Storage-1   | baremetal |
| Cinder-Storage-1 | baremetal |
| Compute-1        | baremetal |
| Controller-1     | baremetal |
| Swift-Storage-1  | baremetal |
+—————————+-----------+

[stack@ospd ~]$ openstack flavor show baremetal
+----------------------------+-----------------------------------------------------+
| Field                      | Value                                               |
+----------------------------+-----------------------------------------------------+
| OS-FLV-DISABLED:disabled   | False                                               |
| OS-FLV-EXT-DATA:ephemeral  | 0                                                   |
| disk                       | 40                                                  |
| id                         | fabc50be-3c0b-45b2-84a9-bf78607b3cc3                |
| name                       | baremetal                                           |
| os-flavor-access:is_public | True                                                |
| properties                 | capabilities:boot_option='local', cpu_arch='x86_64' |
| ram                        | 4096                                                |
| rxtx_factor                | 1.0                                                 |
| swap                       |                                                     |
| vcpus                      | 1                                                   |
+——————————————+-----------------------------------------------------+

[stack@ospd ~]$  heat stack-list --show-nested -f "status=FAILED"
+--------------------------------------+--------------------------------------------------+---------------+----------------------+--------------------------------------+
| id                                   | stack_name                                       | stack_status  | creation_time        | parent                               |
+--------------------------------------+--------------------------------------------------+---------------+----------------------+--------------------------------------+
| a0cf5344-ae2f-44bc-b5dc-85d467f61a6e | overcloud                                        | CREATE_FAILED | 2015-06-19T11:56:26Z | None                                 |
| 1545787f-32b1-407d-9129-5931ccfe1869 | overcloud-Compute-cggqf22wdaft                   | CREATE_FAILED | 2015-06-19T11:56:29Z | a0cf5344-ae2f-44bc-b5dc-85d467f61a6e |
| 7373d273-1b71-424e-b7fb-a4d794c8b65a | overcloud-Compute-cggqf22wdaft-0-5zueofadpzlb    | CREATE_FAILED | 2015-06-19T11:56:30Z | 1545787f-32b1-407d-9129-5931ccfe1869 |
| cb7698fb-9023-464f-a9a0-548b5e03a971 | overcloud-Controller-drimjhocbgyt                | CREATE_FAILED | 2015-06-19T11:56:30Z | a0cf5344-ae2f-44bc-b5dc-85d467f61a6e |
| 941666fa-98ab-464e-83e3-4c893e6e5fad | overcloud-Controller-drimjhocbgyt-0-bwbyuxfori6h | CREATE_FAILED | 2015-06-19T11:56:31Z | cb7698fb-9023-464f-a9a0-548b5e03a971 |
+———————————————————+--------------------------------------------------+---------------+----------------------+--------------------------------------+


[stack@ospd ~]$ heat resource-list --nested-depth 5 overcloud | grep FAILED
| Compute                           | 1545787f-32b1-407d-9129-5931ccfe1869          | OS ...