Explain Docker storage drivers and their performance characteristics.

Docker storage drivers manage container filesystem layers: 1) overlay2 (recommended): Default on most systems, Good performance, Copy-on-write efficiency, Supports up to 128 lower layers, 2) aufs: Legacy driver, Good performance on Ubuntu, Not available on all kernels, 3) devicemapper: Block-level storage, Good for production, Requires configuration, Higher overhead, 4) btrfs: Filesystem-level, Good for development, Snapshot capabilities, Requires btrfs filesystem, 5) zfs: Enterprise features, Compression and deduplication, High memory usage, 6) vfs: No copy-on-write, Poor performance, Used for testing. Performance characteristics: overlay2 has best performance/compatibility balance, devicemapper good for production with proper configuration, aufs legacy but stable, btrfs/zfs have advanced features but higher overhead. Configuration: Set in /etc/docker/daemon.json with storage-driver option, Requires Docker restart, Cannot change on existing installations without data loss. Best practices: Use overlay2 for most cases, Monitor storage performance, Regular cleanup with docker system prune, Consider storage requirements for production.