Specifications

ES/OL
Evaluator Series On-Line™
Storage Systems
Product Analysis
May, 2011
Page 25 of 30
Analysis of Fujitsu ETERNUS DX400 S2
Models DX410 and DX440
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Remote Replication
Remote Equivalent Copy
Fujitsu’s remote replication for the ETERNUS DX400 S2 series is known as Remote Equivalent Copy
(REC), which supports replication between multiple ETERNUS DX400 S2s or other ETERNUS storage
systems. When referencing remote mirroring specifically, this feature is also known as Remote Equivalent
Copy (REC). Fujitsu’s RAC product supports both synchronous and asynchronous remote replication.
Remote replication is supported over both FC and IP connections, utilizing the FCP or iSCSI protocols
respectively. Utilizing iSCSI replication provides a cost effective method that utilizes TCP/IP connections
without requiring an FCIP converter as is the typically the case when using FC protocols.
Fujitsu ETERNUS Remote Equivalent Copy provides the following features:
• Maintain an exact byte-for-byte copy of production data in a remote location
• Write order consistency is supported for both Sync and Asynchronous replication
• Consistency groups are supported
• Failover to secondary sites for disaster recovery
• Integration with OPC for secondary site backup operations
• Management of replication pairs using ETERNUS Advanced Copy Management
• Choose between synchronous and asynchronous mirroring for ETERNUS systems
Figure 7 below illustrates the basic example of an asynchronous replication scenario between two
ETERNUS DX400 S2 storage subsystems.
Figure 7: Basic Example of Asynchronous Replication Between Two Subsystems