Configure XenAPI Storage Manager

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Prerequisites

xensm requires that you use either Citrix XenServer or XCP as the hypervisor. The NetApp and EqualLogic back-ends are not supported on XCP.
Ensure all hosts running volume and Compute services have connectivity to the storage system.

Configuration

Set the following configuration options for the nova volume service: (nova-compute also requires the volume_driver configuration option.)
```
--volume_driver="nova.volume.xensm.XenSMDriver"
--use_local_volumes=False
```

You must create the back-end configurations that the volume driver uses before you start the volume service.

$ nova-manage sm flavor_create <label> <description>
$ nova-manage sm flavor_delete <label>
$ nova-manage sm backend_add <flavor label> <SR type> [config connection parameters]

	Note
	SR type and configuration connection parameters are in keeping with the XenAPI Command Line Interface.

$ nova-manage sm backend_delete <back-end-id>

Example: For the NFS storage manager plug-in, run these commands:

$ nova-manage sm flavor_create gold "Not all that glitters"
$ nova-manage sm flavor_delete gold
$ nova-manage sm backend_add gold nfs name_label=myback-end server=myserver serverpath=/local/scratch/myname
$ nova-manage sm backend_remove 1

Start cinder-volume and nova-compute with the new configuration options.

Create and access the volumes from VMs

Currently, the flavors have not been tied to the volume types API. As a result, we simply end up creating volumes in a "first fit" order on the given back-ends.

Use the standard euca-* or OpenStack API commands (such as volume extensions) to create, destroy, attach, or detach volumes.

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