Glossary - Hitachi G200 User Manual

This glossary defines the special terms used in this document. Click the letter links below to
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2DC
two-data-center. Refers to the primary and secondary sites, or data centers, in which
TrueCopy (TC) and Universal Replicator (UR) combine to form a remote replication
configuration.
In a 2DC configuration, data is copied from a TC primary volume at the local site to the
UR master journal volume at an intermediate site, and then replicated to the UR
secondary volume at the remote site. Since this configuration side-steps the TC
secondary volume at the intermediate site, the intermediate site is not considered a
data center.
3DC
three-data-center. Refers to the local, intermediate, and remote sites, or data centers,
in which TC and UR combine to form a remote replication configuration. A 3DC
configuration can also combine three UR sites.
In a 3DC configuration, data is copied from a local site to an intermediate site and then
to a remote site (3DC cascade configuration), or from a local site to two remote sites
(3DC multi-target configuration).
A
ACK
acknowledgement
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Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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