boots.
== Chassis
The chassis is the physical enclosure housing all the controller components such as the controller/CPU
unit, power supply, and I/O.
== Controller
A controller consists of a board, firmware, and software. It controls the drives and implements the ONTAP
functions.
== DIMM
You must replace a DIMM (dual in-line memory module) when a memory mismatch is present, or you
have a failed DIMM.
== Fan
The fan cools the controller.
== NVDIMM battery
A NVDIMM battery is responsible for maintaining power to the NVDIMM module.
== NVDIMM
The NVDIMM (non-volatile dual in-line memory module) manages the data
transfer from the volatile memory to the non-volatile storage, and
maintains data integrity in the event of a power loss or system
shutdown.
== PCIe or Mezzanine card
A PCIe (peripheral component interconnect express) card is an expansion card that plugs into the PCIe
slot on the motherboard.
A Mezzanine card is an expansion card that is designed to be inserted into a specialized slot on the
motherboard.
== Power supply
A power supply provides a redundant power source in a controller shelf.
== Real time clock battery
A real time clock battery preserves system date and time information if the power is off.
= Boot media
= Overview of boot media replacement - ASA C400
:icons: font
:relative_path: ./asa-c-400/
:imagesdir: /tmp/d20231020-12297-25s5m0/source/./asa-c-250/../media/
The boot media stores a primary and secondary set of system (boot image) files that
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