Bcache

Hands‑on guide for Hetzner dedicated servers: use an NVMe SSD with Bcache to accelerate a 14×22 TB HDD RAID array on Debian 12. Covers enabling the kernel module, installing bcache-tools, formatting and binding backing/cache devices, tuning cache modes, filesystem setup, fstab auto-mount, plus lsblk verification and YABS Fio benchmarks to eliminate I/O stalls during large downloads.