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38 Maintenance

4 Connect a service terminal to the service port. For the location of this port, refer to Front Panel Interface

Ports on page 8 of this User’s Guide.

5 Use the scsiShow command to obtain a detailed listing of all connected SCSI devices as illustrated in

To configure the SNC 6101

on page 22. If the output from the scsiShow command is not accurate,

ensure that all cable connections and terminators are installed correctly and that all devices are present.

Changing the WWN for all FC Ports

Use the following procedure when replacing the SNC 6101 and it is critical that the replacement SNC 6101

uses the same WWN.

1 Read the section Changing the WWN

on page 37.

2 Follow the instructions in Before Changing the WWN on a Replacement SNC 6101

on page 37.

3 Use the wwnGlobalSet command to establish a new base WWN.

wwnGlobalSet updates both the node and port names and presents the following information:

This command will change the WWN for Fibre Channel Ports.

This should only be done when replacing a failed SNC.You should never

operate 2 FC devices that are set to the same WWN. This may destabilize

your SAN.

The unit will be rebooted after the WWN change.

Do you want to proceed (enter "yes" to continue):

4 Type “yes“and press ENTER.

The following message appears:

Enter the new WWN (or q to quit):

5 Enter all eight bytes of your new WWN. Each byte of the entry should be delimited by colons. For

example:

00:00:00:30:8C:02:70:21

The first five bytes of the entry are checked. If the entry is valid, you are prompted for a password.

6 Enter the password OverrideWWN and press ENTER.

This causes the SNC 6101 to reboot.

CAUTION

The WWN override functions are available only through the service

port. These commands cannot be executed if attempted in a telnet

session.

CAUTION

wwnGlobalSet requires that the first byte be entered as "00" even if

fcShowNames displays "10" in that position.

CAUTION

When entering the WWN, the firmware will confirm that the node ID

and OUI match the existing values. This prevents you from

accidentally making the SNC appear as another vendor’s device.

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