IBM E16RMLL-I Implementation Guide - Page 81
Implementation planning, Sony AIT-3, IBM System, Storage™ TS3310, Tape Library
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Tape drive Sony AIT-3 Native speed (MBps) 12 Native capacity (GB) 100 Assumed speed (GB/HR) 33 Assumed capacity (GB) 150 Whether you use Table 2-14 or your own calculations, it is critical when designing a Tivoli Storage Manager solution to measure the backup and potential restore workload against the speed of your tape solution. In our earlier example, for instance, we calculated that we needed to move 86.6 GB/HR to meet SLAs. So based on the theoretical numbers above, a solution that is capable of that data movement would take three LTO Gen 1 tape drives. In addition to calculating backup workload, an architect must also consider administrative processes and potential restores when deciding how many tape drives a system needs. Each day, off-site copies of tapes must be made and reclamation must occur. A potential restore of a large system could also require multiple drives to meet SLAs. A detailed discussion of specific I/O protocol speeds is beyond the scope of this book. However, you should understand the speeds of the drive you choose and recommendations for system connectivity. As a general rule, most hardware vendors recommend no more than two to three tape drives per interface card and, if using Fibre Channel, that tape traffic be separated from disk traffic. The information in Table 2-15 will be used when sizing tape libraries and then when defining them to Tivoli Storage Manager. Table 2-15 Tape drive configuration worksheet Library model Number of drives Drive model Number of on-site tape volumes Number of off-site tape volumes Number of database volumes Number of scratch tapes Number of backup set tape volumes Option IBM System Storage™ TS3310 Tape Library 2 3580 19 29 6 9 5 Chapter 2. Implementation planning 51
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