Maintain AFF A900 hardware
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Maintain the hardware of your AFF A900 storage system to ensure long-term reliability and optimal performance. Perform regular maintenance tasks such as replacing faulty components, as this helps prevent downtime and data loss.
The maintenance procedures assume that the AFF A900 storage system has already been deployed as a storage node in the ONTAP environment.
System components
For the AFF A900 storage system, you can perform maintenance procedures on the following components.
The boot media stores a primary and secondary set of ONTAP image files that the storage system uses to boot. During automated recovery, the storage system retrieves the boot image from the partner node and automatically runs the appropriate boot menu option to install the image on your replacement boot media. The automated boot media recovery process is supported only in ONTAP 9.17.1 and later. If your storage system is running an earlier version of ONTAP, use the manual boot recovery procedure. |
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The boot media stores a primary and secondary set of ONTAP image files that the storage system uses to boot. During manual recovery, you boot the storage system from a USB drive and manually restore the file system image and configuration. If your storage system is running ONTAP 9.17.1 and later, use the automated boot recovery procedure. |
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The chassis is the physical enclosure housing all the controller components such as the controller/CPU unit, power supply, and I/O. |
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A controller consists of a board, firmware, and software. It controls the drives and implements the ONTAP functions. |
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You must replace a DIMM (dual in-line memory module) when a memory mismatch is present, or you have a failed DIMM. |
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The DCPM (destage controller power module) contains the NVRAM11 battery. |
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The fan cools the controller. |
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The I/O module (Input/Output module) is a hardware component that acts as an intermediary between the controller and various devices or systems that need to exchange data with the controller. |
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The LED USB module provides connectivity to console ports and system status. |
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The NVRAM module (Non-Volatile Random Access Memory) allows the controller to retain data across power cycles or system reboots, while the NVRAM DIMM maintains NVRAM settings. |
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A power supply provides a redundant power source in a controller. |
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A real time clock battery preserves system date and time information if the power is off. |