Is your feature request related to a problem? Please describe.
moving cold files to cheaper storage backend

Describe the solution you'd like
allowing configuring multiple storage backend (ssd and hdd, ssd raid, hdd raid etc) and automatic rules to move cold files to cheaper storage backend

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.