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SAN Boot Implementation and Best Practices Guide ... - IBM Redbooks

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3.3 <strong>SAN</strong> configuration for the DS8000 Subsystem<br />

As a best practice <strong>and</strong> to improve the security, all <strong>SAN</strong> Administrators need to think about<br />

how to implement <strong>and</strong> guarantee the operation for their environment.<br />

For optimal performance <strong>and</strong> security, use the following guidelines if you are attaching<br />

multiple paths from a single host system to I/O ports on a host adapter of a storage image, as<br />

shown in Figure 3-8:<br />

► Use attached I/O ports on different host adapters.<br />

► Use multiple physical adapters.<br />

► Do not use all the ports on each host adapter.<br />

Disregarding these path considerations can affect the performance <strong>and</strong> availability of a<br />

storage image.<br />

Fabric1/HBA1 Fabric2/HBA2<br />

Figure 3-8 Example to connect a different HBA to different port on different host card <strong>and</strong> cage<br />

Tip: In summary, to prevent any disruption in the service, plan to use at least two ports on<br />

the storage subsystem, in two different cards, in two different cages. Split your hosts <strong>and</strong><br />

<strong>SAN</strong> <strong>Boot</strong>s to access different paths, balancing the throughput for all available paths at<br />

DS8000.<br />

Chapter 3. <strong>SAN</strong> <strong>Boot</strong> implementation with <strong>IBM</strong> System Storage DS8000 129

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