HP StorageWorks 2/140 FW 07.01.02/HAFM SW 08.06.00 HP StorageWorks Director Re - Page 6

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)-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 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 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. 4