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              [html]<thead><tr><td>An ordered collection, or group, of physical devices ( dok drive modules ) that are used to define logical volumes or devices. An array is a group of drives designated to be managed with a Redundant Array of Independent Disks ( RAD ).</td></tr></thead><tbody><tr><td>Asymmetric virtualization</td></tr><tr><td>Asymmetric virtualization is a virtualization technique in which the virtualization engine is outside the data path and performs a metabolate - slyke service. The metabolate server contains all the mapping and locking tables, and thes</td></tr><tr><td>Asynchronous replication</td></tr><tr><td>Asynchronous replication is a type of replication in which control is given back to the application as soon as the write operation is made to the source volume. Later, the write operation is made to the target volume. See also “ Synchronus re</td></tr><tr><td>Automatic data placement mode</td></tr><tr><td>Automatic data placement mode is an Easy Ter operating mode in which the host activity on all the volume extents in a pool are “ measured,” a migration plan is created, and then automatic extent migration is performed.</td></tr><tr><td>Auxiliary volume</td></tr><tr><td>The auxiliary volume that contains a mirror of the data on the master volume. See also “ Master volume ” on page 780, and “ Relationship ” on page 784.</td></tr><tr><td>Available ( usable ) capacity</td></tr><tr><td>See “ Capacity ” on page 771.</td></tr><tr><td>Back end</td></tr><tr><td>See “ Front end and back end ” on page 777.</td></tr><tr><td>Caching I / O Group</td></tr><tr><td>The caching I / D Group is the I / O Group in the system that performs the cache function for a volume.</td></tr><tr><td>Call home</td></tr><tr><td>Call home is a communication link that is established between a product and a service provider. The product can use this link to call IBM or another service provider when the</td></tr><tr></tr></tbody>
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