HP StorageWorks 2/140 FW 08.01.00 McDATA Products in a SAN Environment Plannin - Page 119
Device Fan-Out Ratio: 10 to 1, Performance Tuning
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Planning Considerations for Fibre Channel Topologies 3 Device Fan-Out Ratio: 10 to 1 10,000 IOPS TM TM Interswitch Link Fabric Connection 1,000 IOPS 1,000 IOPS 1,000 IOPS 1,000 IOPS 1,000 IOPS 1,000 IOPS 1,000 IOPS 1,000 IOPS 1,000 IOPS 1,000 IOPS Figure 3-14 Device Fan-Out Ratio Performance Tuning When designing or tuning a fabric for performance, it is critical to understand application I/O characteristics so that: • Device output in Gbps does not oversubscribe ISLs, leading to fabric congestion. • Device output in IOPS does not result in a connectivity scheme that exceeds fan-out ratios, leading to port congestion. Figure 3-15 illustrates performance tuning for a simple fabric using appropriate ISL connectivity, device locality, and fan-out regions for device connectivity. The fabric is comprised of one core director and six edge switches. Tier 2 servers connect to three switches at the bottom of the figure, and Tier 2 storage devices connect to three switches at the top of the figure. Planning Considerations for Fibre Channel Topologies 3-35