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Just a bunch of disks (JBOD) is a type of multilevel configuration for disks that have not been designed for a RAID array.
JBOD combines all underlying disks in a computer system or array as a logical unit.
JBOD arrays do not usually have any formal structure or pooling architecture within them. Each drive in the system can be accessed individually or as a combined unit. The disks utilized within the JBOD can be of any size. It does not support redundancy, and improves performance of the underlying system. Failure of one drive within the volume can result in failure of the whole volume. The drives can be pooled together using disk volume technologies or applications.