IBM Storwize V7000 Unified Problem Determination Manual page 49

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
LED must be permanently on. If it is off, the link is not connected.
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.
Refer to "Removing the system board" on page 142 and "Installing the system
board" on page 144.
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.
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.
Follow this procedure:
1. Find the system IP address of the control enclosure in the Settings > Network
> IP Report. Log on to the storage system CLI. For example: (default password
is passw0rd):
ssh superuser@<system IP address>
2. Use ping from the storage system CLI to see if any packets are returned from
each of the internal IP addresses used for file modules to communicate with
each other. For example:
IBM_2076:mysystem:superuser>ping 10.254.8.1
PING 10.254.8.1 (10.254.8.1) 56(84) bytes of data.
--- 10.254.8.1 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4005ms
3. You should get 100% packet loss. If you do not get 100% packet loss then some
other machine on your network is using this IP address.
If you cannot stop other machines on your network using these IP addresses and
must change the internal IP address range used then you need to contact IBM
Remote Technical Support to help you to put your file modules back to an
out-of-box state so you can choose a different internal IP address range. All other
IP addresses used by the system can be changed without needing to put the file
modules back to an out-of-box state.
Chapter 3. Getting started troubleshooting
29