The alternative for asynchronous replication; a system where two disk/storage systems are kept synchronized at all times. This enables the secondary system to take over in case of a failure on the primary system without data loss, making it ideal for building highly available systems and disaster recovery.
The disadvantage of this form of replication is that all data needs to be written to both the primary and secondary system before the write is reported as completed; this can lead to slower writes if the secondary system is too far away or the link between the two systems becomes saturated.
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