Statement: An enterprise creates three 20 GB thin LUNs for the online transaction system, email system, and backup system in a 60 GB storage resource pool. As a result, data fails to be written to the backup system. Is this statement True or False?

• A. Cannot Be Determined
• B. True
• C. False
• D. Not Applicable

Answer: (C)

Thin provisioning separates the amount of space you allocate to a LUN from the space actually used on disk. You can present three 20 GB LUNs, totaling 60 GB of virtual capacity, on a storage pool that has 60 GB of physical space. The system only consumes physical space as data is written. So, as long as there is available physical space, writes to any of the LUNs—including the backup one—will succeed. Data would fail to be written only if the actual physical space in the pool is exhausted (more than 60 GB of real data written across the LUNs). Therefore, the statement claiming writes fail is not necessarily true.