Overview of TrueCopy and Universal Replicator

REST API Reference Guide for Virtual Storage Platform 5000, Virtual Storage Platform E Series, and Virtual Storage Platform G/F Series

Version
93-07-0x
90-09-0x
88-08-10
Audience
anonymous
Part Number
MK-98RD9014-17
TrueCopy and Universal Replicator create a copy of a data volume between storage systems. You can create a pair or manage the pair status by issuing an API operation from a REST API client.
TrueCopy

By synchronizing with the data of the local storage system, TrueCopy copies the data to the remote storage system. Therefore, if the volumes of the local storage system (primary volumes) and the volumes of the remote storage system (secondary volumes) are in the PAIR status, the data is consistent.

A pair consists of a primary volume and a secondary volume. You can perform operations on pairs in units of copy groups. A copy group is a group made up of copy pairs. Each copy group consists of a device group made up of primary volumes, and a device group made up of secondary volumes.

For details on TrueCopy, see the Hitachi TrueCopy® User Guide.

Universal Replicator

Universal Replicator asynchronously copies the data of the local storage system to the data of the remote storage system. The updated data (journal data) is stored in the master journal volume, and is copied to the data of the secondary volumes via the restore journal volume.

For Universal Replicator, the primary volumes and the master journal volume are called the master journal, and the secondary volumes and the restore journal volume are called the restore journal. Perform operations on pairs in units of mirrors (copy groups) that are the correspondence relationship between the master journal and the restore journal. A mirror (copy group) is a group made up of copy pairs. Each mirror (copy group) consists of a device group made up of primary volumes, and a device group made up of secondary volumes.

For details on Universal Replicator, see the Hitachi Universal Replicator User Guide.