HP StorageWorks 64 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Envir - Page 122
Tier 2 Storage, Tier 2 Servers, Interswitch Link, Fabric Connection
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Planning Considerations for Fibre Channel Topologies 3 • 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. Tier 2 Storage 11 to 1 Fan-Out Region 6 to 1 Fan-Out Region 11,000 IOPS 9,000 IOPS 3 to 1 Fan-Out Region 6,000 IOPS 10/100 RST TM PWR ERR 10/100 RST TM PWR ERR TM 6,000 IOPS 10/100 RST TM PWR ERR Local Tier 1 Devices 2,000 IOPS 40 MBps 2,000 IOPS 10/100 RST 31 29 27 25 23 TM 21 19 17 15 30 28 26 24 22 20 18 13 11 9 7 5 3 1 16 14 12 10 8 6 4 2 0 PWR ERR 11 Total Servers 10 MBps 1,000 IOPS 10/100 RST TM PWR ERR 6 Total Servers 20 MBps 1,500 IOPS Tier 2 Servers Interswitch Link Fabric Connection Figure 3-15 Fabric Performance Tuning 3-36 McDATA Products in a SAN Environment - Planning Manual 10/100 RST TM PWR ERR 3 Total Servers 30 MBps 2,000 IOPS