If /etc/serialnum does not exist, it is an indication that your machine could not obtain the serial number from the hardware. In this case you need to enter the serial number manually. The serial number is found on the back of the machine in the lower right hand corner. You should see a tag that says:
NetworkAppliance SN: xxxx
Use a text editor to create /etc/serialnum and put the machine's serial number in it. The file should contain a single line that only has the serial number. The file is used to help Network Appliance's customer service group process your autosupport email more efficiently.
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