Disk mirroring, also known as RAID 1, is the replication of data
to two or more disks. Disk mirroring is a good choice for applications that require high
performance and high availability such as transactional applications, email, and operating
systems.
Because both disks are operational, data can be read from them simultaneously, which makes read
operations quite fast. Write operations, however, are slower because every write operation is done
twice.
This was last updated in May 2011
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