Definition

disk mirroring (RAID 1)

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.

Related glossary terms: portability, switching fabric
This was last updated in May 2011
Posted by: Margaret Rouse

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