split mirror point-in-time copy:    1. Any of a class of point-in-time copy implementations or the resulting copies in which the storage for the copy is synchronized to the source of the copy and then split. A split mirror copy occupies as much storage as the source of the copy. 2. A method for generating a frozen image of a set of data. A split mirror frozen image is a set of storage devices containing a complete copy of data as of the moment of frozen image creation. When a split mirror frozen image has served its purpose, the contents of the storage device(s) it occupies must be resynchronized with the original data from which it was split.

See also: local replica

Value Proposition

Split mirror point-in-time copies improve RTO because only changed blocks need be copied on recovery. In many cases, this is less than 3% of the total storage per day. It may also allow for more recovery points, improving RPO, however snapshots, Continuous Data Protection (CDP) and application or database techniques tend to have a bigger impact on RPO, when properly implemented.

© 1999-2009 Knowledge Transfer. All rights reserved.