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Datera drivers

Datera iSCSI driver

The Datera Data Services Platform (DSP) is a scale-out storage software that turns standard, commodity hardware into a RESTful API-driven, intent-based policy controlled storage fabric for large-scale clouds. The Datera DSP integrates seamlessly with the Block Storage service. It provides storage through the iSCSI block protocol framework over the iSCSI block protocol. Datera supports all of the Block Storage services.

System requirements, prerequisites, and recommendations

Prerequisites

All nodes must have access to Datera DSP through the iSCSI block protocol.
All nodes accessing the Datera DSP must have the following packages installed:
- Linux I/O (LIO)
- open-iscsi
- open-iscsi-utils
- wget

cinder.volume.drivers.datera.datera_iscsi

Configuring the Datera volume driver

Modify the /etc/cinder/cinder.conf file for Block Storage service.

Enable the Datera volume driver:

[DEFAULT]
# ...
enabled_backends = datera
# ...

Optional. Designate Datera as the default back-end:

default_volume_type = datera

Create a new section for the Datera back-end definition. The VIP can be either the Datera Management Network VIP or one of the Datera iSCSI Access Network VIPs depending on the network segregation requirements. For a complete list of parameters that can be configured, please see the section Volume Driver Cinder.conf Options

[datera]
volume_driver = cinder.volume.drivers.datera.datera_iscsi.DateraDriver
san_ip = <VIP>
san_login = admin
san_password = password
datera_tenant_id =
volume_backend_name = datera
datera_volume_type_defaults=replica_count:3

Enable the Datera volume driver

Verify the OpenStack control node can reach the Datera VIP:

$ ping -c 4 <VIP>

Start the Block Storage service on all nodes running the cinder-volume services:

$ service cinder-volume restart

Configuring one (or more) Datera specific volume types

There are extra volume type parameters that can be used to define Datera volume types with specific QoS policies (R/W IOPS, R/W bandwidth) and/or placement policies (replica count, type of media, IP pool to use, etc.)

For a full list of supported options please see the Volume-Type ExtraSpecs section in the driver documentation. See more examples in the Usage section.

# Create 2 replica volume type
$ openstack volume type create datera_2way --property volume_backend_name=datera --property DF:replica_count=2

# Create volume type with limited write IOPS
$ openstack volume type create datera_iops --property volume_backend_name=datera --property DF:write_iops_max=5000

Supported operations

Create, delete, attach, detach, manage, unmanage, and list volumes.
Create, list, and delete volume snapshots.
Create a volume from a snapshot.
Copy an image to a volume.
Copy a volume to an image.
Clone a volume.
Extend a volume.
Support for naming convention changes.

Configuring multipathing

Enabling multipathing is strongly reccomended for reliability and availability reasons. Please refer to the following file for an example of configuring multipathing in Linux 3.x kernels. Some parameters in different Linux distributions may be different.

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