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              [html]<thead><tr><td>safne physical device ( MLIVs ).</td></tr><tr><td>Because of the way the file systems work, many I / O to file system metastata disk regions exist. For example, for a journaling like system, a write to a file might require two or more writes to the file system purnal ; at minimum, one to make a no o</td></tr></thead><tbody><tr><td>If multiple volumes ( exact with those the system ) are delimed on the same set of MDDsks, and all ( ror most ) of them store their metabolis on the same MDDs, a disproportionably large ( OD last is generated on this MDDsk, which can neural in subo</td></tr><tr><td>Mirrored volumes</td></tr><tr><td>BM Spectrum Virtualize offers the capability to mirror volumes, which means that a single volume presented to a host can have two physical copies. Each volume copy can belong to a different pool, and each copy has the same virtual capacity c</td></tr><tr><td>When a server writes to a mirrored volume, the storage system writes the data to both copies. When a server reads a mirrored volume, and the volume copies and synchronized, the system reads the data from the primary copy ( in the management GU</td></tr><tr><td>If one of the mintred volume copies is temporarily unavailable ( for example, because the storage system that provides the pool is unavailable ), the volume remains accessible to serviews. The system remembers which areas of the volume wo</td></tr><tr><td>The use of mirrored volumes has the following consequences :</td></tr><tr><td>• Improves availability of volumes by protecting them from a single storage system failure.</td></tr><tr><td>• Enables concurrent maintenance of a storage system that does not natively support concurrent maintenance.</td></tr><tr><td>• Provides an alternative method of data migration.</td></tr><tr><td>• Enables conversion between fully allocated volumes and thin - provisioned volumes.</td></tr><tr><td>• Enables space reclamation of thin - provisioned volumes.</td></tr><tr><td>Note : Volume mirroring is not a true disaster recovery ( DR ) solution because both copies are accessed by the same node pair and addressable by only a single cluster. However, if correctly planned, it can improve availability.</td></tr></tbody>
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