Insistent Domain Identification (Id); Open Trunking - HP 316095-B21 - StorageWorks Edge Switch 2/24 User Manual

Insistent Domain Identification (ID)

This is a parameter in the Configure Switch Parameters dialog box, available
from Configure menu in the Product Manager application. Enabling this option
sets the domain ID configured in the Preferred Domain ID field in the
Configure Switch Parameters dialog box as the active domain identification
when the fabric initializes. A static and unique domain identification is required
by the Fabric Binding feature because the feature's Fabric Membership list
identifies switches by WWN and Domain ID. If a duplicate preferred domain ID
is used, then insisted, warnings occur when directors and switches are added to a
Fabric Membership List.
If Fabric Binding or Enterprise Fabric Mode is enabled, this option is
automatically enabled and cannot be disabled unless these options are disabled
when the director or switch is offline. If the director or switch is online, disabling
Insistent Domain ID will disable Enterprise Fabric Mode and Fabric Binding.

Open Trunking

Interswitch links (ISLs) connect ports between E_Ports on Fibre Channel switches
and link these switches into a multiswitch fabric. Multiple ISLs may be connected
between the switches in the fabric. Data from an attached end device (server or
storage) flows through these ISLs to a target end-device connected to a switch
somewhere in the fabric. A data flow is data received from a specified receive port
that is destined for a port in a specified target domain (switch). The list of ISLs
that are candidates for being rerouted (to or from) is derived from the fibre
shortest path first (FSPF) algorithm.
The Open Trunking feature monitors the average data rates of all traffic flows on
ISLs (from a receive port to a target domain) and periodically adjusts routing
tables to reroute data flows from congested links to lightly loaded links and
optimize bandwidth use. The objective of Open Trunking is to make the most
efficient possible use of redundant ISLs between neighboring switches, even if
these ISLs have different bandwidths.
Load-balancing among the ISLs does not require user configuration, other than
enabling Open Trunking. However, you can modify or "tweak" default settings
for congestion thresholds (per port) and low BB_credit threshold if desired,.
High Availability Fabric Manager User Guide
Optional Features
191