1.7.2 Example 2: Calculate performance throughput If the daily workload requirements are to back up 20 TB, restore 15 TB, replicate all data,  and receive 10 TB of replication, consider for maintenance operations 30 TB of deletes  (20 TB from backups, and 10 TB from incoming replication), and 10.5 TB of defrags.  These total 105.5 TB, which, when converted, represent a sustained performance required  of 1,281 MBps. Another way that this requirement can be expressed is from a time frame constraint  perspective, that is, having the backups, restores, and replication complete in a specific time  frame. For example, complete the 20 TB backups, 15 TB restores, and 30 TB of replication in  12 hours. To achieve that, a sustained throughput of at least 1578 MBps is needed. If the  main operations are completed in 12 hours, the system is left with 12 hours to do MRC  operations at 1578 MBps, which will suffice. 20  IBM ProtecTIER Implementation and Best Practices Guide