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IBM System Storage N series Hardware Guide by Marco Schwarz, Tom Provost, Steven Pemberton, Dirk Peitzmann, Jeff Lin, Roland Tretau

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Hardware and software upgrades
This chapter addresses high-level procedures for some common hardware and software upgrades.
This chapter includes the following sections:
21.1 Hardware upgrades
Many hardware upgrades or additions can be performed non-disruptively:
Replacing the head (controller), if you are replacing it with the same type, and with the same adapters
Replacing the system board
Replacing or adding an NVRAM or NIC, such as upgrading from 2-port to 4-port gigabit Ethernet [GbE], or 1-port to ...

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