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

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3
Planning Considerations for Fibre Channel Topologies
3-35
Planning Considerations for Fibre Channel Topologies
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.
Interswitch Link
Fabric Connection
1,000 IOPS
1,000 IOPS
1,000 IOPS
1,000 IOPS
1,000 IOPS
1,000 IOPS
10,000 IOPS
1,000 IOPS
1,000 IOPS
1,000 IOPS
1,000 IOPS
Device Fan-Out Ratio: 10 to 1