Storage

Block virtualization: a new type of RAID technology. Block virtualization divides disks into multiple chunks (CKs) of a fixed size and organizes them into multiple chunk groups (CKGs). When a disk fails, the disks of the CKG where the CKs in the faulty disk reside also participate in reconstruction. This significantly increases the disks involved in the reconstruction, eliminating the performance bottleneck in the reconstruction of traditional RAID groups and improving the data reconstruction speed


Grain: a small block with a fixed size divided from the CKG (the default size of a grain is 8 KB). Grains are the basic units that constitute a thin LUN. Logical Block Addresses (LBAs) in a grain are consecutive