Eu consideraria os pramfs : o estado dos desenvolvedores:
Many embedded systems have a block of non-volatile RAM separate from normal system memory, i.e. of which the kernel maintains no memory page descriptors. For such systems it would be beneficial to mount a read/write filesystem over this "I/O memory", for storing frequently accessed data that must survive system reboots and power cycles or volatile data avoiding to write on a disk or flash. An example usage might be system logs under /var/log or debug information of a flight-recorder.
Tem várias vantagens em relação aos sistemas de arquivos tradicionais, é leve e suporta atributos estendidos, ACLs, rótulos de segurança e congelamento.