NVRAM serves as a very performant storage medium for a read/write mirrored journal that is split between two NetApp HCI storage nodes.
When an application sends a write request, it is mirrored between the NVRAM on two NetApp HCI storage nodes for high availability and redundancy. Once both copies are stored, the primary node acknowledges the write completion to the host. Once the write is acknowledged, the system will copy the data from NVRAM to the persistent storage layer (SSD).
NetApp, NetApp HCI [HCI]/1.8 P1, x86
Persistent Write Buffer, Reads/Writes, Data Availability