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              [html]<thead><tr><td>3.11.1</td><td>Planning for image mode volumes</td></tr></thead><tbody><tr><td>Use image models wolves to present to hosts data that is written to the back - end storage before it was virtualized. An image mode volume directly corresponds to the MDlok from which it is created. Therefore, volume logical block address ( L</td><td>Image mode volumes are extremely useful tool in storage migration and when introducing BM SAN Virtualization Controller to a storage environment.</td></tr><tr><td>3.11.2</td><td>Planning for thin - provisioned volumes</td></tr><tr><td>A thin - provisioned volume has a virtual capacity and a read capacity. Virtual capacity is the virume strange capacity that a hot sees as exsidideline. Real capacity is the actual strape capacity that is allocated to a volume copy from a stu</td><td>When planning use of thin - provisioned volumes, consider expected usage patterns for the volume. In particular, the actual size of the data and the rate of data change.</td></tr><tr><td>Thin - provisioned volumes require more ICDs because of directory accesses. For fully random access, and a workload with TITI ’ s reads and SITs wites, a thin - provisioned volume requires approximately one directory IVD for every user IVD</td><td>However, the directory is two - way write - back - cached ( as with the Slorwize V7000 lastwrite cache ), so certain applications perform better.</td></tr><tr><td>Also, the ability to thin - provision vitames can be a worthwithle tool that allows hoots to see storage space significantly larger than what is allocated within the storage pool. Thin provisioning can also simpsonage allocation manage a</td></tr><tr></tr><tr></tr><tr></tr></tbody>
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