HP 2000fc Reference Manual page 42

To change the host port interconnect setting:
1. Select Manage > General Config > Host Port Configuration.
2. In the Advanced Options panel, click Change FC Port Interconnect Settings.
The Host Port Configuration panel displays the current interconnect setting.
3. Set Internal Host Port Interconnect to Interconnected (enabled) or Straight-through
(disabled).
The default is Straight-through.
This setting affects all host ports on both controllers.
4. Click Save And Continue.
The main Host Port Configuration page is displayed.
Setting FC Host Port Topology
For MSA2000 Family storage systems, topology means the path that data travels
between devices: either through a series of connected devices (loop) or directly
from one device to another (point-to-point). In a switch-attach configuration, either
topology is supported but loop is preferred. In a direct-attach configuration, only
loop is supported.
In a dual-controller FC storage system, the topology to set for host ports depends on
the system's host port interconnect setting (see "Configuring FC Host Port
Interconnects" on page 41), and affects host access to volumes during failover, when
their owning controller's host ports are inaccessible. This relationship is described
in the following paragraphs.
Volumes can be mapped with access privileges through specific host ports to data
hosts, with a LUN that identifies each mapping. Host access to volumes during a
controller failover is determined by the storage system's host port interconnect and
topology settings. For example, assume volumes are mapped through controller A's
host ports and controller A fails over to controller B. The host can access controller
A's volumes through controller B's host ports as follows:
If all host ports are set to loop topology, both controllers' volumes are presented
■
on controller B's host ports.
If one or more host ports are set to point-to-point topology, controller B presents
■
its volumes on half of its host ports and presents controller A's volumes on the
remaining host ports.
42 HP StorageWorks 2000 Family Modular Smart Array reference guide • August 2008