Support for Cinder volume replication
Documenting information on how cloud administrators can adjust the cinder volume driver to enable volume replication. This feature safeguards environments from data loss. Change-Id: I7ba72a14914cb1b0359e532e619ea36dfe1b73e0 Closes-Bug:#1360768
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@ -97,6 +97,38 @@ The above extra specs are used by the scheduler to find a back end that
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supports thin provisioning, thick provisioning, or both to match the needs
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supports thin provisioning, thick provisioning, or both to match the needs
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of a specific volume type.
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of a specific volume type.
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Volume replication extra specs
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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OpenStack Block Storage has the ability to create volume replicas.
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Cloud administrators can define a storage policy that includes
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replication by adjusting the cinder volume driver. Volume replication
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for OpenStack Block Storage helps safeguard OpenStack environments from
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data loss during disaster recovery.
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To enable replication when creating volume types, configure the cinder
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volume with ``capabilities:replication="<is> True"``.
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Each volume created with the replication capability set to `True`
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generates a copy of the volume on a storage back end.
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One use case for replication involves an OpenStack cloud environment
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installed accross two data centers located nearby each other. The
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distance between the two data centers in this use case is the length of
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a city.
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At each data center, a cinder host supports the Block Storage service.
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Both data centers include storage back ends.
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Depending on the storage requirements, there can be one or two cinder
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hosts. The cloud administrator accesses the
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:file:`/etc/cinder/cinder.conf` configuration file and sets
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``capabilities:replication="<is> True"``.
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If one data center experiences a service failure, cloud administrators
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can redeploy the VM. The VM will run using a replicated, backed up
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volume on a host in the second data center.
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Capacity filter
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Capacity filter
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~~~~~~~~~~~~~~~
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~~~~~~~~~~~~~~~
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