Isl Maximums - HP StorageWorks 4000/6000/8000 - Enterprise Virtual Arrays Reference Manual

Rule
nl
number
2 The supported limit of interconnected switches in a single fabric is 31, provided that any Edge
Switch 2/32 or Director 2/64 in the fabric is deployed at the edge of the fabric.
3 In fabric configurations exceeding 1,500 devices, use Edge Switch 2/32 and Director 2/64 at
the edge of the fabric.
4 A maximum of three switch hops (four switches) is supported between any two devices.
5 A ring fabric topology is supported with a maximum of seven M-series switches.
6 Assign a unique domain number (domain ID) and a unique WWN to each switch. The switch
configuration parameters must be the same for each switch.
Do not configure any switches with a domain ID of 8, which is reserved for HP-UX.
7 HP requires that all switches in a single-fabric SAN or multi-fabric SAN use the same firmware
version for the same switch models. You can use two successive switch firmware versions
nl
temporarily in one fabric or multiple fabrics when updating switch firmware.
NOTE:
Not all topologies can support the maximum port or switch count.

ISL maximums

When designing a fabric using 12-port, 16-port, 24-port, and 32-port switches, all ports can be used
as ISLs, with a maximum of one half of the total ISL port count configured to the same destination
switch.
NOTE:
The Edge Switch 2/12 requires licensing to enable ISL ports.
Description
SAN Design Reference Guide 163