McDATA Sphereon 4300 Specifications Page 101

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3
Planning Considerations for Fibre Channel Topologies
3-17
Planning Considerations for Fibre Channel Topologies
Figure 3-10 2-by-14 Core-to-Edge Fabric
Each edge switch connects (through at least one ISL) to each core
switch but not to other edge switches. There are typically more device
connections to an edge switch than ISL connections; therefore edge
switches act as consolidation points for servers and storage devices.
The ratio of ISLs to device connections for each switch is a function of
device performance. For additional information, refer to ISL
Oversubscription.
Fibre channel devices (servers and storage devices) connect to core or
edge fabric elements in tiers. These tiers are defined as follows:
Tier 1 - A Tier 1 device connects directly to a core director or
switch. Tier 1 devices are typically high-use or high-I/O devices
that consume substantial bandwidth and should not be connected
through an ISL. In addition, fibre connection (FICON) devices
cannot communicate through E_Ports (ISLs) and must use Tier 1
connectivity. For additional information, refer to FCP and FICON
in a Single Fabric.
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Interswitch Link
Fabric Connection
Tier 2 Devices
Edge
Switches
Edge
Switches
Tier 1
Device
Core
Director
Tier 1
Device
Tier 2 Devices
Core
Director
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