This application provides a
server cluster
system and a data
replication method, which can be applied to the field of cluster
backup technology. The
server cluster
system includes: a host determining the synchronous replication mode of multiple standby machines based on the mirror attributes and link information of multiple standby machines; based on the standby
machine disk identifier corresponding to the data to be replicated, and according to the synchronous replication mode of the target standby
machine, sending cluster information and the data to be replicated to the target standby
machine in
server replication mode via
fiber optic channel, and sending cluster information and the data to be replicated to the target standby machine in disk replication mode via network channel and
fiber optic channel respectively; any standby machine storing the data to be replicated to the target disk according to the cluster information; and, if the asynchronous protection mode is determined to be the standby protection mode and the
resource utilization rate is greater than a first predetermined threshold, integrating the stored data and the data to be updated and replicated received during the
polling period, and sending the integrated data to the
backup server via
fiber optic channel.