An administrator sees a message in the system console that a drive is bad in the single-volume JBOD storage array. A few minutes later, a user calls the help desk to report an inability to read a…

JBOD contains no redundancy or mirroring layer, so replacing the drive does not trigger any rebuild process - the lost data cannot be reconstructed by the array.

Hot spare support is a RAID feature found in configurations such as RAID 1, 5, or 6; JBOD has no concept of a hot spare and cannot initiate an automatic rebuild.

JBOD concatenates independent drives into a single logical volume with no mirroring, striping with parity, or fault-tolerance mechanisms of any kind. When one drive fails, all data that resided on that drive is unrecoverable from the array itself. The administrator must replace the failed drive and then restore the lost data from the last known good backup to return the volume to a consistent state.

Parity-based recovery is exclusive to RAID 5 and RAID 6 arrays; JBOD does not write parity data, so no parity drive exists to assist in reconstruction.