Datera drivers¶

Datera iSCSI driver¶

The Datera Elastic Data Fabric (EDF) 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 EDF 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¶

Must be running compatible versions of OpenStack and Datera EDF. Please visit here to determine the correct version.
All nodes must have access to Datera EDF through the iSCSI block protocol.
All nodes accessing the Datera EDF must have the following packages installed:
- Linux I/O (LIO)
- open-iscsi
- open-iscsi-utils
- wget

Description of Datera configuration options¶
Configuration option = Default value	Description
`datera_503_interval` = `5`	(Integer) Interval between 503 retries
`datera_503_timeout` = `120`	(Integer) Timeout for HTTP 503 retry messages
`datera_api_port` = `7717`	(String) Datera API port.
`datera_debug` = `False`	(Boolean) True to set function arg and return logging
`datera_debug_replica_count_override` = `False`	(Boolean) ONLY FOR DEBUG/TESTING PURPOSES True to set replica_count to 1
`datera_disable_profiler` = `False`	(Boolean) Set to True to disable profiling in the Datera driver
`datera_tenant_id` = `None`	(String) If set to ‘Map’ –> OpenStack project ID will be mapped implicitly to Datera tenant ID If set to ‘None’ –> Datera tenant ID will not be used during volume provisioning If set to anything else –> Datera tenant ID will be the provided value
`datera_api_version` = `2`	(String) Datera API version. DEPRECATED

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 san_ip can be either the Datera Management Network VIP or one of the Datera iSCSI Access Network VIPs depending on the network segregation requirements:

volume_driver = cinder.volume.drivers.datera.DateraDriver
san_ip = <IP_ADDR>            # The OOB Management IP of the cluster
san_login = admin             # Your cluster admin login
san_password = password       # Your cluster admin password
san_is_local = true
datera_num_replicas = 3       # Number of replicas to use for volume

Enable the Datera volume driver¶

Verify the OpenStack control node can reach the Datera san_ip:

$ ping -c 4 <san_IP>

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

$ service cinder-volume restart

QoS support for the Datera drivers includes the ability to set the following capabilities in QoS Specs

read_iops_max – must be positive integer
write_iops_max – must be positive integer
total_iops_max – must be positive integer
read_bandwidth_max – in KB per second, must be positive integer
write_bandwidth_max – in KB per second, must be positive integer
total_bandwidth_max – in KB per second, must be positive integer

# Create qos spec
$ openstack volume qos create --property total_iops_max=1000 total_bandwidth_max=2000 DateraBronze

# Associate qos-spec with volume type
$ openstack volume qos associate DateraBronze VOLUME_TYPE

# Add additional qos values or update existing ones
$ openstack volume qos set --property read_bandwidth_max=500 DateraBronze

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¶

The following configuration is for 3.X Linux kernels, some parameters in different Linux distributions may be different. Make the following changes in the multipath.conf file:

defaults {
checker_timer 5
}
devices {
    device {
        vendor "DATERA"
        product "IBLOCK"
        getuid_callout "/lib/udev/scsi_id --whitelisted --
        replace-whitespace --page=0x80 --device=/dev/%n"
        path_grouping_policy group_by_prio
        path_checker tur
        prio alua
        path_selector "queue-length 0"
        hardware_handler "1 alua"
        failback 5
    }
}
blacklist {
    device {
        vendor ".*"
        product ".*"
    }
}
blacklist_exceptions {
    device {
        vendor "DATERA.*"
        product "IBLOCK.*"
    }
}

Datera drivers