HP Surestore 64 FW 05.01.00 and SW 07.01.00 Director Release Notes (AA-RTDVC-T - Page 8

Supported Configurations, Fabric Elements, Inhomogeneous fabric, Number of Interswitch Links ISLs

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Supported Configurations 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 in a single fabric is 24. Because this number is subject to change, contact your HP authorized service representative for the current number of interconnected switches supported in 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) - Theoretically, the ISL limit per Director 2/64 is 48 and for Director 2/140 is 70. The maximum supported number of ISLs is 75% of installed ports for the director 2/64, and 50% of installed ports 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 7. The maximum supported hop count in a single path through a fabric is 3. Because this number is subject to change, contact your HP authorized service representative for the current hop count supported by a single fabric path. Note: 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. 8 Director Release Notes

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Supported Configurations
8
Director Release Notes
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 in a single fabric is 24. Because this number is subject to change,
contact your HP authorized service representative for the current number of
interconnected switches supported in 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)
– Theoretically, the ISL limit per
Director 2/64 is 48 and for Director 2/140 is 70. The maximum supported
number of ISLs is 75% of installed ports for the director 2/64, and 50% of
installed ports 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 7. The maximum
supported hop count in a single path through a fabric is 3. Because this
number is subject to change, contact your HP authorized service
representative for the current hop count supported by a single fabric path.
Note:
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.