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DATA CENTER BEST PRACTICES

SAN Design and Best Practices 19 of 84

fig15_SAN_Design

4 × 8 Gbps Control Ports

4 × 8 Gbps ISLs

1:1 Oversubscription for Initiator to the Core

Figure 15. One-to-one oversubscription for targets into the core.

The realized oversubscription ratio of host-to-ISL should be roughly the same as the host-to-target ratio, taking

into account the bandwidth (that is, if there are four hosts accessing a single 4 Gbps storage port, then those

four hosts should have a 4 Gbps pipe into the core.) In other words, match device utilization and speeds with

ISL speeds, as shown in Figure 16.

fig16_SAN_Design

24 x 4 Gbps Initiators

4 × 8 Gbps ISLs

3:1 Oversubscription for Initiator to the Core

Figure 16. Three-to-one oversubscription for hosts coming into the core.

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