On a NetApp AFF A220 system, both the NVMEM battery and the chassis fan are considered Field Replaceable Units (FRUs). The NVMEM battery, housed within the NVMEM module, is critical for protecting data in the non-volatile memory cache during a power loss and is designed for periodic replacement. The chassis fan modules are essential for system cooling and are designed to be hot-swappable, allowing for replacement without system downtime. Official NetApp documentation provides specific procedures for field technicians or customers to replace these components on-site.

B. mSATA boot device: The mSATA boot device is an internal component on the controller module's mainboard and is not designed to be replaced independently in the field. The entire controller module is the FRU.

C. NVME Flash Cache feature: This describes a software-enabled feature, not a distinct hardware component. While the AFF A220 uses NVMe for caching, it is integrated into the controller, not a separate, field-replaceable card.

1. NetApp Documentation: Replace a fan module in an AFF A220 or FAS2750 controller module. This official guide explicitly details the procedure for removing and installing a new fan module, confirming it as an FRU.

Source: NetApp Product Documentation, AFF A220 and FAS2700 Series > Replace parts > Replace a fan module.

2. NetApp Documentation: Replace the NVMEM battery in an AFF A220 or FAS2750 controller. This document provides the step-by-step process for replacing the NVMEM battery, which is part of the NVMEM module, classifying it as an FRU.

Source: NetApp Product Documentation, AFF A220 and FAS2700 Series > Replace parts > Replace the NVMEM battery.

3. NetApp Documentation: Replace a controller module. The procedure for resolving a boot media issue involves replacing the entire controller module, which implicitly confirms that the internal mSATA boot device is not an independent FRU.

Source: NetApp Product Documentation, AFF A220 and FAS2700 Series > Replace parts > Replace a controller module.