CRUSH

CRUSH (Controlled Reduction of Unwanted Side Hazards) is a data storage algorithm used by systems like Ceph to efficiently distribute and manage large amounts of data across many servers or drives. It works by assigning data to different locations based on mathematical calculations, ensuring even load distribution and fault tolerance. When new storage is added or removed, CRUSH recalculates data placement without needing to move everything, enabling scalable, resilient storage systems. Essentially, CRUSH helps system administrators manage data effectively, ensuring quick access, durability, and balanced use of resources.