Btrfs Allocator Hints: Optimizing Mixed Storage Performance

Btrfs now features allocator hints, allowing users to specify devices for metadata and data allocation, optimizing performance in mixed storage setups (e.g., SSDs and HDDs). By prioritizing faster SSDs for metadata and slower HDDs for data, users can improve filesystem responsiveness and storage efficiency. This requires a patched kernel and command-line configuration. Improper configuration can lead to out-of-space errors; careful monitoring is recommended.