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In disk arrays, a business continuance volume (BCV) is EMC Corporation's term for an independently addressable copy of a data volume, that uses advanced mirroring technique for business continuity purposes.
Use
BCVs can be detached from the active data storage at a point in time and mounted on non-critical servers to facilitate offline backup or parallel computing. Once offline processes are completed, these BCVs can be either:
- discarded
- used as a source to recover the production data
- re-attached (re-synchronized) to the production data again
Types
There are two types of BCVs:
- A clone BCV is a traditional method, and uses one-to-one separate physical storage (splitable disk mirror)
- least impact on production performance
- high cost of the additional storage
- persistent usage
- A snapshot BCV, that uses copy on write algorithm on the production volume
- uses only a small additional storage, that only holds the changes made to the production volume
- lower cost of the additional storage
- reads and writes impact performance of production storage
- once snapshot storage fills up, the snapshot becomes invalid and unusable
- short-term usage
- uses only a small additional storage, that only holds the changes made to the production volume
See also
References
- "Disaster Recovery Journal". Archived from the original on 2009-08-14. Retrieved 2012-03-01.