IBM Storwize V7000 Unified Problem Determination Manual page 52

If you are looking at a problem regarding built-in Ethernet port 3, built-in Ethernet
port 4, or any network connections to PCI slot 4, refer to "Host to file modules
connectivity" on page 25.
Isolation procedures:
Ensure that both of the file module are powered up before you begin this
procedure:
v Determine the state of the Ethernet LEDs by examining the Ethernet port LEDs.
v The activity LED flashes when there is activity on the connection. The link state
If your link is not connected perform the following actions to check the port status
until it is corrected or connected:
1. Verify that each end of the cable is securely connected.
2. Replace the Ethernet cable.
3. Replace the failed Ethernet port on the server by replacing the system planer.
Duplicate IP address procedure:
If you are experiencing odd intermittent problems with communications between
the file modules then it could be that some other machine on your network is
using the same IP address as one of the four IP addresses used for the file modules
to communicate with each other. These IP addresses were set during initial setup
from the internal IP address range that you chose in the initialization tool. Refer to
Checking that IP addresses are not already in use to see the possible address
values.
It is always possible that somebody in your site could set up another machine to
use one or more IP address that your Storwize V7000 Unified system is already
using. Use the management GUI to check which four IP addresses the file modules
are currently using to communicate with each other. See the device = mgmt0 box,
in Monitoring > System Details in the network panel under each file module
interface node name.
28
Storwize V7000 Unified: Problem Determination Guide Version
Table 9. Ethernet ports and type of connections. (continued)
Item Port
5
IMM Ethernet
port
6
PCI slot 4, port 1 10 GbE external
7
PCI slot 4, port 0 10 GbE external
LED must be permanently on. If it is off, the link is not connected.
Refer to "Removing the system board" on page 157 and "Installing the system
board" on page 159.
IP address is
assigned by
Purpose InitTool
Ethernet link to No
the system X
Integrated
Management
Module
No
network
connection
No
network
connection
Use
Not supported
Optional file
access
Optional file
access