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Survivor's Guide to 2006: Storage and Servers: Page 5 of 14

Say No to Virtualization--Unless

2006 will not be the year of disk virtualization, no matter what EMC, QLogic and other vendors tell you. The number of customers with so much disk space that they need to virtualize is tiny. And even in such cases, many customers have been reluctant to move based on the problems this technology introduces in data recovery scenarios. With a normal SAN, you can always plug directly into a storage array if your switch dies. With virtualized SANs, this often isn't the case, because the switch decided where to put your data. You should have a strong business case for virtualization before you let vendors tell you what you need.

That said, disk virtualization makes perfect sense in some cases. If you have a large SAN implementation that uses heterogeneous arrays, for example, your research might show virtualization is a good idea. Check out the virtualization offered by your array or switch vendor. Generally speaking, the more data you have, and the better you are at classifying it, the more disk virtualization makes sense.

Multicore Is Here!