ScaleIO is a software-only solution that uses existing servers' local disks and LAN to create a virtual SAN that has all of the benefits of external storage but at a fraction of the cost and complexity. Using the driver, OpenStack Block Storage hosts can connect to a ScaleIO Storage cluster.
This section explains how to configure and connect an OpenStack block storage host to a ScaleIO storage cluster.
The ScaleIO Block Storage driver allows limiting the IOPS and bandwidth that one SDC generates for a volume.
Add the following keys to the volume type to set the SDC's limits for volume of this type:
sio:iops_limit- limits the volume IOPS. Must be larger than 10.sio:bandwidth_limit- limits the volume network bandwidth. The bandwidth is in KB per second.
Since the limits are per SDC, they will be applied after the volume is attached to an instance, and thus to a compute node/SDC.
The Block Storage driver supports creation of thin provisioned volumes, in addition to thick provisioning.
The provisioning type settings should be added as an extra specification of the volume type, as follows:
sio:provisioning_type=thin\thick
If the provisioning type is not specified, the default value of thick will be used.
Create, delete, clone, attach, and detach volumes
Create and delete volume snapshots
Create a volume from a snapshot
Copy an image to a volume
Copy a volume to an image
Extend a volume
Get volume statistics
Edit the cinder.conf file by adding the configuration below under the
[DEFAULT] section of the file in case of a single back end or under a separate section in case
of multiple back ends (for example [ScaleIO]). The configuration file is usually located under the
following path /etc/cinder/cinder.conf.
For a configuration example, refer to the configuration example.
Configure the driver name by adding the following parameter:
volume_driver = cinder.volume.drivers.emc.scaleio.ScaleIODriver
The ScaleIO Meta Data Manager monitors and maintains the available resources and permissions.
To retrieve the MDM server IP, use the drv_cfg --query_mdms CLI command.
Configure the MDM server IP by adding the following parameter:
san_ip = ScaleIO GATEWAY IP
ScaleIO allows multiple protection domains (groups of SDSs that provide backup for each other).
To retrieve the available protection domains, use the scli --query_all and search for the protection domains section.
Configure the protection domain for newly created volumes by adding the following parameter:
sio_protection_domain_name = ScaleIO Protection Domain
A ScaleIO storage pool is a set of physical devices in a protection domain.
To retrieve the available storage pools, use the scli --query_all and search for available storage pools.
Configure the storage pool for newly created volumes by adding the following parameter:
sio_storage_pool_name = ScaleIO Storage Pool
Multiple storage pools and protection domains can be listed for use by the virtual machines.
To retrieve the available storage pools, use the scli --query_all and search for available storage pools.
Configure the available storage pools by adding the following parameter:
sio_storage_pools = Comma separated list of protection domain:storage pool name
OpenStack Block Storage requires a ScaleIO user with administrative privileges. ScaleIO recommends creating a dedicated OpenStack user account that holds an administrative user role.
Refer to the ScaleIO User Guide for details on user account management
Configure the user credentials by adding the following parameters:
san_login = ScaleIO username
san_password = ScaleIO password
Configuring multiple storage back ends enables you to create several back-end storage solutions that serve the same OpenStack Compute resources.
When a volume is created, the scheduler selects the appropriate back end to handle the request, according to the specified volume type.
Save thecinder.conffile and restart cinder by running the following command:
$ openstack-service restart cinder-volume
You can update the cinder.conf file by editing the necessary parameters as follows:
[Default] enabled_backends = scaleio [scaleio] volume_driver = cinder.volume.drivers.emc.scaleio.ScaleIODriver volume_backend_name = scaleio san_ip =GATEWAY_IPsio_protection_domain_name =Default_domainsio_storage_pool_name =Default_poolsio_storage_pools =Domain1:Pool1,Domain2:Pool2san_login =SIO_USERsan_password =SIO_PASSWD
The ScaleIO driver supports these configuration options:
| Configuration option = Default value | Description |
|---|---|
| [DEFAULT] | |
sio_force_delete = False |
(BoolOpt) Whether to allow force delete. |
sio_protection_domain_id = None |
(StrOpt) Protection domain id. |
sio_protection_domain_name = None |
(StrOpt) Protection domain name. |
sio_rest_server_port = 443 |
(StrOpt) REST server port. |
sio_round_volume_capacity = True |
(BoolOpt) Whether to round volume capacity. |
sio_server_certificate_path = None |
(StrOpt) Server certificate path. |
sio_storage_pool_id = None |
(StrOpt) Storage pool id. |
sio_storage_pool_name = None |
(StrOpt) Storage pool name. |
sio_storage_pools = None |
(StrOpt) Storage pools. |
sio_unmap_volume_before_deletion = False |
(BoolOpt) Whether to unmap volume before deletion. |
sio_verify_server_certificate = False |
(BoolOpt) Whether to verify server certificate. |
