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Both numbers start flashing and the Fault LED on the operations panel illuminates after about five
seconds.
6. Power-cycle the storage expansion unit to make the new expansion unit shelf ID take effect.
7. Replace the front bezel.
Cabling the EXN3200
Use these instructions to cable the EXN3200.
The ACP and SAS ports on the EXN3200 Input/Output modules are designated as circle and square ports
(not In and Out ports). See the IBM System Storage EXN3200 Storage Expansion Unit Hardware and Service
Guide for a comparison between SAS and Fibre Channel storage expansion units and for more
information about the EXN3200.
Attention:
v If you are using HBAs, they must be installed in the storage system before you cable the system.
v Always cable SAS connections first, and then cable ACP connections.
1. Cable the N series controllers.
Refer to the Installation and Setup Instructions for the N series storage system to which you are
connecting the EXN3200.
2. Cable the storage expansion units.
The illustrations in "Cabling a single-controller NAS or iSCSI configuration" on page 7 and "Cabling
a high availability NAS or iSCSI configuration" on page 9 show the steps for cabling two common
configurations.
Note: In the descriptions of these configurations, references to the first and last disk shelves in a stack
are to the first, or closest, shelf in a SAS stack, which makes the first connections to the N series
controller, and to the last, or ending, shelf in a stack.
For SAS and ACP cabling rules, and for more cabling configurations, see the IBM System Storage N
series Universal SAS and ACP Cabling Guide.
Alternate Control Path (ACP) capability
For maximum storage availability and stability, storage systems with EXN3200 storage expansion units
have the option to use the ACP capability. ACP is a protocol that enables Data ONTAP to manage and
control the EXN3200 storage subsystem. It uses a separate network from the data path so it can
independently perform recovery whenever certain interruptions are detected in the data path.
To use the ACP capability, you must cable the ACP ports on the EXN3200s and connect the EXN3200s to
the dedicated network interface on each N series storage system controller. At system setup, you enable
the ACP functionality by configuring ACP parameters. If your storage system does not have a dedicated
onboard network interface for ACP, you dedicate one at system setup.
Standard ACP cabling rules apply to all N series storage systems and can be found in the IBM System
Storage N series Universal SAS and ACP Cabling Guide.
Attention: ACP cabling requires CAT6 Ethernet LAN cables.
ACP functionality, configuration, and enabling information can be found in the Data ONTAP Storage
Management Guide for 7-Mode.
Note: If at initial storage system setup you choose not to use the ACP capability, you can use it later by
cabling the ACP connections and enabling ACP by running setup again.
6
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