JBOD time synchronization system and method and JBOD

The invention provides a JBOD time synchronization system and method and a JBOD, the JBOD time synchronization system is arranged in the JBOD, and the JBOD time synchronization system at least comprises a real-time clock circuit for providing real-time clock information; and the SAS expansion chip is respectively connected with the real-time clock circuit, the plurality of hard disks and a server, controls the plurality of hard disks, acquires real-time clock information from the real-time clock circuit, transmits the real-time clock information to the server through an SAS hard disk interface, and performs time synchronization with the server through the real-time clock information. According to the invention, the real-time clock circuit is additionally arranged in the JBOD, and independent time timing and time synchronization functions of the JBOD are realized through the control chip in the JBOD, so that the technical problem that the JBOD in the prior art does not have independent time timing and time syn