ETERNUS DX60/DX80/DX90 Disk storage system User Guide - Fujitsu

Chapter 1 Overview
1.3 Functions
● QuickOPC
QuickOPC copies all data as initial copy as OPC. After the initial copy has completed, only
updated data (differential data) need to be copied hereafter.
QuickOPC is suitable for the following usages.
- Making backup for less updated data
- Making system test data replication
- Restoration from the backup
● SnapOPC+
As updates occur in the source data, SnapOPC+ saves the pre-change for each affected
generation level. Registering standby storage areas in the SDP allows SnapOPC+ copy
sessions to continue even when the amount of update data exceeds the copy destination
capacity.
SnapOPC+ is suitable for the following usages.
- Making temporary backup for tape backup
- Backup for less updated data (generation management is available)
● EC (Equivalent Copy)
EC makes a mirror copy of the copy source to the copy destination beforehand, then
suspends the copy and treats all data as independent data.
When copying is Resumed, only updated data in the copy source is copied to the copy
destination. If the copy destination data has been changed, copy the copy source data again.
EC is suitable for the following usages.
- Making backup
- Making system test data replication
● REC (Remote Equivalent Copy)
REC is used to copy data among multiple devices using the EC copy method.
REC is suitable for the following usages.
- Replicating system test datasets
- Duplicating databases on multiple devices
- Backing up data to remote devices
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ETERNUS DX60/DX80/DX90 Disk storage system User Guide
Copyright 2011 FUJITSU LIMITED P3AM-3042-08ENZ0