IBM E16RMLL-I Implementation Guide - Page 67
LAN/WAN transports, LAN-free data movement SAN backup and restore
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LAN/WAN transports The performance of your network backup solution will be no better than the performance of your network. You must consider expected and real performance of your network when you are designing a Tivoli Storage Manager solution. As an example, calculate theoretical network throughput using Fast Ethernet and a 40% efficiency: Assume 40-80% of total theoretical throughput for a TCP/IP adapter or protocol. Be careful of the CPU usage and real throughput of faster TCP/IP protocols (such as would). They often do not perform even close to the 80% rule. Measure LAN throughput outside of Tivoli Storage Manager with simple protocols such as FTP. This will provide a true picture of how a network is performing. 100Mb × 1B × 1GB × 60s × 60 min ×.4 ≈ 18 GB s 8b 1024MB 1min 1Hr Hr Using this type of calculation, you can calculate the anticipated throughput for any network transport. Table 2-8 shows the most common throughputs. Table 2-8 Common throughputs Technology MBps Fast Ethernet 100 MBps Gigabit Ethernet 1000 MBps T1 1.54 MBps T3 45 MBps Assume speed 18 GB/hr at 40% efficiency 180 GB/hr at 40% efficiency 0.5 GB/hr at 80% efficiency 16 GB/hr at 80% efficiency Using this table, your own calculations, and any real testing you may have done, you can validate the amount of data you need to move to back up and restore workload against your SLAs and your network transports. Obviously, if the network will not meet your SLAs, either the SLAs must be relaxed or the network must be improved. LAN-free data movement (SAN backup and restore) Tivoli Storage Manager for Storage Area Networks allows for Tivoli Storage Manager backups and restores to be sent over the SAN instead of the LAN, as shown in Figure 2-2 on page 38. Chapter 2. Implementation planning 37
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