Glossary

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mirror

A disk that maintains an exact copy or duplicate of another disk. A mirror disk is often called a secondary, and the disk that it copies is called the primary. All writes to the primary disk are also made to the mirror (or secondary) disk.

A type of snapshot captured on a mirror disk. At an appropriate moment, all further writes to the primary disk are held back from the mirror, thus causing the mirror to "split" from the primary. As a result of the split, the mirror becomes a snapshot of the primary. The snapshot then can be backed up.

A physical copy of a storage object that is maintained as an exact duplicate of the original storage object as the original object changes due to write activity.

A duplicate copy of a volume and the data therein (in the form of an ordered collection of subdisks). Each mirror is one copy of the volume with which the mirror is associated.

A copy of a volume and its data. There can be several mirrors per volume. The terms mirror and plex are used synonymously.

A duplicate copy of a volume and the data therein (in the form of an ordered collection of subdisks). Each mirror is one copy of the volume with which the mirror is associated. The terms mirror and plex can be used synonymously.

A duplicate copy of a volume and the data therein (in the form of an ordered collection of subdisks). Each mirror consists of one plex of the volume with which the mirror is associated.