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Hi nova devs,

How can I use placement api's if my instance path is mounted on shared storage server (e.g. NFS)?

I am trying to set multinode setup with NFS shared storage for all nodes to share disk resources along with placement services. As of now it is creating resource providers for each of the compute node and adds the DISK_GB for each resource provider.

For example below are my environment details:

NODE A: compute
NODE B: controller + compute

Following entries are made in resource_providers table:

+---------------------+---------------------+----+--------------------------------------+------------------------+------------+----------+
| created_at          | updated_at          | id | uuid                                 | name                   | generation | can_host |
+---------------------+---------------------+----+--------------------------------------+------------------------+------------+----------+
| 2017-01-30 06:49:17 | 2017-01-30 09:12:06 |  1 | 6cbbaf2b-5b8c-4f38-8b34-ee23791056a6 | openstack-VirtualBox   |          3 |        0 |
| 2017-01-30 09:02:29 | 2017-01-30 09:11:03 |  3 | bad71c26-8f36-43ea-abf4-bdbeffda9e54 | openstack-VirtualBox-1 |          2 |        0 |
+---------------------+---------------------+----+--------------------------------------+------------------------+------------+----------+

Following are the entries of inventories tables, of which 89 indicates the DISK_GB (size of shared storage):

+---------------------+---------------------+----+----------------------+-------------------+-------+----------+----------+----------+-----------+------------------+
| created_at          | updated_at          | id | resource_provider_id | resource_class_id | total | reserved | min_unit | max_unit | step_size | allocation_ratio |
+---------------------+---------------------+----+----------------------+-------------------+-------+----------+----------+----------+-----------+------------------+
| 2017-01-30 06:49:19 | 2017-01-30 09:10:37 |  1 |                    1 |                 0 |     1 |        0 |        1 |        1 |         1 |               16 |
| 2017-01-30 06:49:19 | 2017-01-30 09:10:37 |  2 |                    1 |                 1 | 11210 |      512 |        1 |    11210 |         1 |              1.5 |
| 2017-01-30 06:49:19 | 2017-01-30 09:10:37 |  3 |                    1 |                 2 |    89 |        0 |        1 |       89 |         1 |                1 |
| 2017-01-30 09:02:31 | 2017-01-30 09:11:03 |  7 |                    3 |                 0 |     1 |        0 |        1 |        1 |         1 |               16 |
| 2017-01-30 09:02:31 | 2017-01-30 09:11:03 |  8 |                    3 |                 1 | 10253 |      512 |        1 |    10253 |         1 |              1.5 |
| 2017-01-30 09:02:31 | 2017-01-30 09:11:03 |  9 |                    3 |                 2 |    89 |        0 |        1 |       89 |         1 |                1 |
+---------------------+---------------------+----+----------------------+-------------------+-------+----------+----------+----------+-----------+------------------+

However still I am able to create the instances over the size of actual shared storage.

Please let me know how to configure resource_providers in case of shared storage servers are used for disk resources.

Thank you,

Bhagyashri

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