Disk mirroring is the replication of logical disk volumes in separate physical disks to ensure that data is always available. The mirrored volume is a complete logical representation of separate volume copies.
This is technique very common in RAID 1.
Disk mirroring or replication of data is particularly useful for applications that require high performance and availablity such as transactional applications and operating systems. It helps to prevent losses from disasters; if the primary drive is damaged, traffic is then switched to the mirrored drives. This mirrored copy is able to become operational on failover because the operating system and application software are replicated to the mirrored drive along with the data used by those applications.
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