Non-Disruptive Operations

NetApp’s clustered Data ONTAP provides these benefits for non-disruptive operations:

The movement of NetApp FlexVol volumes that contain Cinder volumes between different pools of disks (aggregates)
The movement of Manila shares between different aggregates

In addition, using NetApp Clustered Data ONTAP or E-Series, OpenStack environments gain these two key differentiators that would not be possible with volumes residing on Compute nodes:

The ability to evacuate OpenStack instances from a Compute node for maintenance and upgrades.
The ability to migrate Cinder volumes from one backend to another. The source and destination backend can be in the same cluster or in different clusters. The following is an example of migrating a Cinder volume that is in-use across two clustered Data ONTAP hosts:

#nova instance with an attached cinder volume
[root@stlrx300s7-107 ~(keystone_admin)]# nova show ubuntu-instance
+--------------------------------------+--------------------------------------------------------+
| Property                             | Value                                                    |
+--------------------------------------+--------------------------------------------------------+
...
| name                                 | ubuntu-instance       |
| os-extended-volumes:volumes_attached | [{"id": "195d2581-d650-4618-ad65-a93ea0c3a89e"}]         |
| status                               | ACTIVE                                                   |
...

#The volume resides in the stlrx300s7-107@cinder-lma#10.250.118.49:/cinder_flexvol_OSTK02 clustered Data ONTAP host. 
[root@stlrx300s7-107 ~(keystone_admin)]# cinder show 195d2581-d650-4618-ad65-a93ea0c3a89e
+--------------------------------+--------------------------------------------------------------+
|            Property            |                             Value                              |
+--------------------------------+--------------------------------------------------------------+
...
|               id               |              195d2581-d650-4618-ad65-a93ea0c3a89e              |
|     os-vol-host-attr:host      | stlrx300s7-107@cinder-lma#10.250.118.49:/cinder_flexvol_OSTK02 |
|             status             |                             in-use                             |
...
+--------------------------------+--------------------------------------------------------------+

#Migration of the volume to the stlrx300s7-107@cinder-lmb#10.250.118.51:/cinder_flexvol_OSTK09 clustered Data ONTAP host.
[root@stlrx300s7-107 ~(keystone_admin)]# cinder migrate 195d2581-d650-4618-ad65-a93ea0c3a89 
estlrx300s7-107@cinder lmb#10.250.118.51:/cinder_flexvol_OSTK09

#Upon Completion of migration
[root@stlrx300s7-107 ~(keystone_admin)]# cinder show 195d2581-d650-4618-ad65-a93ea0c3a89e
+--------------------------------+--------------------------------------------------------------+
|            Property            |                             Value                              |
+--------------------------------+--------------------------------------------------------------+
...
|               id               |              195d2581-d650-4618-ad65-a93ea0c3a89e              |
|     os-vol-host-attr:host      | stlrx300s7-107@cinder-lmb#10.250.118.51:/cinder_flexvol_OSTK09 |
| os-vol-mig-status-attr:migstat |                            success                             |
|             status             |                             in-use                             |
...
+--------------------------------+--------------------------------------------------------------+

+--------------------------------------+--------------------------------------------------------+

	Note
	Cinder migration has a dependency on the hypervisor. Please verify that updating the following packages will not affect your environment before proceeding. These packages are for Red Hat/CentOS. For other distributions, please update your hypervisor accordingly. `yum install -y qemu-kvm libvirt libvirt-python libguestfs-tools virt–install`

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