Comment 4 for bug 1574503

 reproduce this bug steps:
1、I have two hosts and both hosts are installed cinder-volume.
[root@2C5_10_DELL05 cinder(keystone_admin)]# cinder service-list
+------------------+-----------------------------------+------+----------+-------+----------------------------+-----------------+
| Binary | Host | Zone | Status | State | Updated_at | Disabled Reason |
+------------------+-----------------------------------+------+----------+-------+----------------------------+-----------------+
| cinder-scheduler | 2C5_10_DELL05 | nova | enabled | up | 2016-05-09T11:48:31.000000 | None |
| cinder-volume | 2C5-10_DELL01@KS3200ISCSIDriver-2 | nova | enabled | up | 2016-05-09T11:49:16.000000 | None |
| cinder-volume | 2C5-10_DELL01@lvm | nova | disabled | up | 2016-05-09T11:49:17.000000 | None |
| cinder-volume | 2C5_10_DELL05 | nova | enabled | down | 2016-05-06T03:02:08.000000 | None |
| cinder-volume | 2C5_10_DELL05@FJDXISCSIDriver-1 | nova | enabled | up | 2016-05-09T11:48:29.000000 | None |
| cinder-volume | 2C5_10_DELL05@FJDXISCSIDriver-2 | nova | enabled | up | 2016-05-09T11:48:29.000000 | None |
| cinder-volume | 2C5_10_DELL05@KS3200ISCSIDriver-1 | nova | enabled | up | 2016-05-09T11:48:29.000000 | None |
| cinder-volume | 2C5_10_DELL05@KS3200ISCSIDriver-2 | nova | enabled | up | 2016-05-09T11:48:30.000000 | None |
| cinder-volume | 2C5_10_DELL05@lvm | nova | enabled | up | 2016-05-09T11:48:32.000000 | None |
+------------------+-----------------------------------+------+----------+-------+----------------------------+-----------------+
2.The host "2C5_10_DELL05" driver use support "pools" version. I create a volume in the host.
[root@2C5_10_DELL05 cinder(keystone_admin)]# cinder show eb7e638b-8385-4c73-8b60-1c4c9e89a072
+---------------------------------------+------------------------------------------------------------------------+
| Property | Value |
+---------------------------------------+------------------------------------------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| consistencygroup_id | None |
| created_at | 2016-05-09T01:10:59.000000 |
| description | None |
| encrypted | False |
| id | eb7e638b-8385-4c73-8b60-1c4c9e89a072 |
| metadata | {u'volname': u'OpenCos_R6775347838262577007', u'vdname': u'ipsan_vd2'} |
| multiattach | False |
| name | test_zy22 |
| os-vol-host-attr:host | 2C5_10_DELL05@KS3200ISCSIDriver-2#ipsan_vd2 |
| os-vol-mig-status-attr:migstat | error |
| os-vol-mig-status-attr:name_id | 6581e25b-2744-4648-8b49-23fc834da6fc |
| os-vol-tenant-attr:tenant_id | 853481fe4d1e4d1eb0136c7ecf46e5e7 |
| os-volume-replication:driver_data | None |
| os-volume-replication:extended_status | None |
| replication_status | disabled |
| size | 1 |
| snapshot_id | None |
| source_volid | None |
| status | available |
| user_id | 95d365ac3e3948c9be554a33855c6e07 |
| volume_type | ksip |
+---------------------------------------+------------------------------------------------------------------------+

3. The other host(2C5-10_DELL01)use the older driver version(haven't supported the pools)
4. I migrate the volume to the step3 host.
cinder migrate eb7e638b-8385-4c73-8b60-1c4c9e89a072 2C5-10_DELL01@KS3200ISCSIDriver-2#KS3200_IPSAN
5. migrate failed.
   [root@2C5_10_DELL05 cinder(keystone_admin)]# cinder show eb7e638b-8385-4c73-8b60-1c4c9e89a072
+---------------------------------------+------------------------------------------------------------------------+
| Property | Value |
+---------------------------------------+------------------------------------------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| consistencygroup_id | None |
| created_at | 2016-05-09T01:10:59.000000 |
| description | None |
| encrypted | False |
| id | eb7e638b-8385-4c73-8b60-1c4c9e89a072 |
| metadata | {u'volname': u'OpenCos_R6775347838262577007', u'vdname': u'ipsan_vd2'} |
| multiattach | False |
| name | test_zy22 |
| os-vol-host-attr:host | 2C5_10_DELL05@KS3200ISCSIDriver-2#ipsan_vd2 |
| os-vol-mig-status-attr:migstat | error |
| os-vol-mig-status-attr:name_id | 6581e25b-2744-4648-8b49-23fc834da6fc |
| os-vol-tenant-attr:tenant_id | 853481fe4d1e4d1eb0136c7ecf46e5e7 |
| os-volume-replication:driver_data | None |
| os-volume-replication:extended_status | None |
| replication_status | disabled |
| size | 1 |
| snapshot_id | None |
| source_volid | None |
| status | available |
| user_id | 95d365ac3e3948c9be554a33855c6e07 |
| volume_type | ksip |
+---------------------------------------+------------------------------------------------------------------------+
The scheduler log as following:
2016-05-09 19:40:24.610 14702 ERROR cinder.scheduler.manager [req-1bc39a54-1c4b-44a6-88e9-e480067ce12a 95d365ac3e3948c9be554a33855c6e07 853481fe4d1e4d1eb0136c7ecf46e5e7 - - -] Failed to schedule_migrate_volume_to_host: No valid host was found. Cannot place volume eb7e638b-8385-4c73-8b60-1c4c9e89a072 on 2C5-10_DELL01@KS3200ISCSIDriver-2#KS3200_IPSAN