Chapter 5 Configuration Overview 5-9
5.3.1 Point-to-Point Configuration Guidelines
Remember the following guidelines when implementing point-to-point
configurations in your array and connecting to fabric switches:
■ The default mode is “Loop only.” You must change the Fibre Channel Connection
mode to “Point-to-point only” with the firmware application (see “Choosing Loop
or Point-to-Point Fibre Connection” on page 6-7).
Caution – If you keep the default loop mode and connect to a fabric switch, the
array automatically shifts to public loop mode. As a result, communication
between the array and the switched fabric runs in half duplex (send or receive)
instead of providing the full duplex (send and receive) performance of point-to-
point mode.
■ Check the host IDs on all the channels to ensure that there is only one ID per
channel (on the primary controller or on the secondary controller) for point-to-
point mode. When viewing the host IDs, there should be one primary controller
ID (PID) or one secondary controller ID (SID); the alternate port ID should
display N/A. Proper point-to-point mode allows only one ID per channel.
■ On the Sun StorEdge 3511 FC array, if one of the dual-ports of channel 0 is
connected to a switch (port FC0), the other FC0 port on that controller and the
two FC0 ports on a redundant controller cannot be used. Similarly, if one of the
channel 1 ports is connected with a switch (port FC1), the other FC1 port on that
controller, and the two FC1 port on a redundant controller cannot be used.
■ If you change the mode to “Point-to-point only” and attempt to add a second ID,
the controller does not allow you to add an ID to the same controller and channel.
For example, if you have ID 40 on CH 0 PID, and N/A on CH 0 SID, the
controller does not allow you to add another PID to CH 0.
The controller displays a warning if the user is in point-to-point mode and tries to
add an ID to the same channel but on the other controller. The warning is
displayed because you have the ability to disable the internal connection between
the channels on the primary and secondary controller using the set inter-
controller link CLI command and, by doing this, you can have one ID on the
primary and another ID on the secondary as a legal operation.
However, if you ignore this warning and add an ID to the other controller, the
RAID controller does not allow a login as a Fabric-Loop (FL) port because this
would be illegal in a point-to-point configuration.
■ The firmware application allows you to add up to eight IDs per channel (four IDs
on each controller), which forces the fabric switch port type to become Fabric-
Loop. To ensure F-port behavior (full fabric/full duplex) when attaching to a
switch, only one ID must be present on each channel and the array port must be
set to point-to-point mode.
■ Do not connect more than one port per channel on an array to a fabric switch.
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