Administrator Guide

Internal Backup Power Supply
Each NAS controller is equipped with an internal backup power supply (BPS) that protects data during a power failure. The BPS provides
continuous power to the NAS controllers for a minimum of 5 minutes in case of a power failure and has sufficient battery power to allow
the NAS controllers to safely shut down. In addition, the BPS provides enough time for the NAS controllers to write all data from the
cache to nonvolatile internal storage.
The NAS controllers regularly monitor the BPS battery status, which requires the BPS to maintain a minimum level of power for normal
operation. To ensure the BPS battery status is accurate, the NAS controllers routinely undergo battery calibration cycles. During a battery
calibration cycle, the BPS goes through charge and discharge cycles; therefore, battery error events during this process are expected. A
battery calibration cycle takes up to 7 days to complete. If a NAS controller starts a battery calibration cycle, and the peer NAS controller
BPS has failed, the NAS controllers enter journaling mode. Entering this mode might impact performance, so you should repair a failed BPS
as soon as possible.
Internal Storage
Each NAS controller has an internal storage device that is used only for the FluidFS images and for a cache storage offload location in the
event of a power failure. The internal hard drive does not provide the NAS storage capacity.
Internal Cache
Each NAS controller has an internal cache that provides fast reads and reliable writes.
Overview of the FS8600 Architecture
Scale-out NAS consists of these components:
• Hardware
• FluidFS cluster
• Storage Center
• NAS appliance network interface connections
• SAN network
• Internal network
• LAN/client network
The following figure shows an overview of the scale-out FS8600 architecture.
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FluidFS Administration