User`s guide

Chapter 3. Implementing the INRANGE FC/9000 Fibre Channel Director 221
Enabling loop attachments
To make loop node attachment possible, we have to enable the director ports to
autosense loop devices. We have two ways to make these settings:
򐂰 Enable Arbitrated Loop Auto Sense for the entire director
򐂰 Enable Arbitrated Loop Auto Sense for a specific director port
Enabling loop attachments for a specific director port
First we will allow loop attachment for the port called hewlett_td0.
In the IN-VSN navigation tree, we select FIO-8, then the specific port named
hewlett_tdo. In the port view we leave the General tab in the foreground.
Here we activate the Auto Sense Arbitrated Loop Enabled field as illustrated in
Figure 3-39.
Note: To read the following topics, it is useful to understand the differences
between terms like director port, loop port, loop devices, initiators, targets:
򐂰 A director port is an actual physical port of the FC/9000 director.
򐂰 Loop ports are the external ports attached to a director port. Loop ports use
loop protocols like private loop or public loop. They are sometimes referred
as loop devices or loop nodes.
򐂰 Initiators are ports that actually control the IO flow and give commands.
Typically initiators are FC host adapter ports.
򐂰 Targets are ports that get commands. Normally targets are storage devices
such as tape drives or disk arrays.
򐂰 Loop devices running public loop are referred as NL-ports.