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Supported configurations
Operation of multiple switches in a fabric topology is subject to the following topology
limits. Consider the impact of these limits when planning the fabric.
NOTE:
For more information about planning the fabric, refer to HP StorageWorks SAN High
Availability
Planning Guide.
• Fabric Elements—Each fabric element is defined by a unique domain ID that
ranges between 1 and 31; therefore, the theoretical limit of interconnected
directors in a single fabric is 31. The supported limit of interconnected switches
inasinglefabricis24.Becausethisnumberissubjecttochange,contactyour
HP authorized service representative for the current number of interconnected
switches supported in a single fabric.
• Inhomogen eous fabric—To determine if interoperability is supported for a
product, or if restrictions apply, refer to the product publications, or contact your
HP authorized service representative.
• Number of Interswitch Links (ISLs)—The maximum supported number of ISLs
for edge switches is all available switch ports. For redundancy, at least two
ISLs should connect any two switch-class fabric elements. Bec ause this number
is subject to change, contact your HP authorized service representative for the
current number of ISLs supported per switch.
• Hop Count—The Fibre Channel theoretical limit of ISL connections traversed (hop
count) in a single path through a fabric is seven. The maximum supported hop
count in a single path through a fabric is three. Because this number is subject to
change, contact your HP authorized service representative for the current hop
count suppor ted by a single fabric path.
The hop count is equal to the number of ISL connections traversed in a single
path, not the total number of ISL connections between devices.
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