FW 07.01.02/HAFM SW 08.06.00 HP StorageWorks Director Release Notes (AA-RTDVH-TE, August 2005)

Supported configura
tions
Operation of multi
ple 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 elem ent 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 supp orted i n a single fabric.
• Inhomogeneous 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 is
75% of installed ports for the Director 2/64, a nd 50% of installed por ts for
the Director 2/140. For redundancy, at least two ISLs should connect any
two director-class fabric elements. Because this number is subject to change,
contact your HP authorized service representative for the current number of ISLs
supported per director.
• Hop Count—The Fibre Channel theoretical limit of ISL connections traversed (hop
count) in a single path through a fabric is seven. The maximum suppor ted hop
count in a single path through a fabric is three. Because this number is subject to
change, c ontact your HP authorized service representative for the current hop
count supported 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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