text: **2.5.11 Read Intensive Flash Drives**
  
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              [html]<thead><tr><td></td><td>Generally, two < underline > two </ underline > two < underline > grate </ underline > two < underline > two </ underline > available : I he Multi - idevel ( MLC ) and Single - level cell ( SLC ).</td></tr></thead><tbody><tr><td></td><td>The most common SSD technology is MLC. They are found in consumer products, such as postable electromic devices. However, they are also present in some embryona strange products. Enterprise class SSDs are built on mid - to trigh - endurand</td></tr><tr><td></td><td>MLC : BSDs uses multi - cell to store data and feature the Wear Leveling method, which is the process to evenly spread the data across all memory cells on the SSD. This method helps to eliminate potential hotepots caused by repetitive Write - E</td></tr><tr><td></td><td>SLC SSDs use a single cell to store one bit of data, which makes them faster.</td></tr><tr><td></td><td>To support particular business demands, IBM Spectrum Virtualize qualified the use of Read Intensive ( RI ) Fash Drives ( based on SSD technology ) with applications where the read operations are significantly high.</td></tr><tr><td></td><td>RI Flash Drives are available as an optional purchase product to IBM SAIV Volume Controller and IBM Stonxize Family.</td></tr><tr><td>. 5.12 Managed disks</td><td>A managed disk ( MDsk ) is the unlicleage that IBM Spectram Vitualize withalizes. This untimight be a logistal visume on an external storage array that is presented to the BBM Stairwise. ATDX, or a PAR3 consulting of internal drives. BBM Spe</td></tr><tr><td></td><td>An MDisk has the following modes :</td></tr><tr><td></td><td>• Array</td></tr><tr><td></td><td>Array mode MDisks are constructed from drives by using the RAID lunction. Array MDisks are always associated with storage pools.</td></tr><tr><td></td><td>• Unmanaged</td></tr><tr><td></td><td>Unmanaged MDisks are not being used by the system. This situation might occur when an MDiok is first imported into the system, for example.</td></tr><tr><td></td><td>• Managed</td></tr><tr><td></td><td>Managed MDisks are assigned to a storage pool and provide extents so that volumes can use it.</td></tr><tr><td></td><td>• lmage</td></tr><tr><td></td><td>Image MDsks are assigned directly to a volume with a one - b - one mapping of extents between the MDsks are the volume. This situation is normally used when importing logical volumes into the clustered system that already have data on them, wh</td></tr><tr><td></td></tr></tbody>
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