Fujitsu ETERNUS DX S5 Series Design Manual page 109

2. Basic Functions
Backup (Advanced Copy)
• If the SnapOPC+ function is used from ETERNUS SF AdvancedCopy Manager, among the created multiple
generations, the data of intermediate generations can be deleted.
●
EC
An EC creates data that is mirrored from the copy source to the copy destination beforehand, and then
suspends the copy and handles each data independently.
When copying is resumed, only updated data in the copy source is copied to the copy destination. If the copy
destination data has been modified, the copy source data is copied again in order to maintain equivalence
between the copy source data and the copy destination data. EC is suitable for the following usages:
Performing a backup
•
• Performing system test data replication
Caution
• Prepare an encrypted SDPV when an encrypted SDV is used.
• If the SDP capacity is insufficient, a copy cannot be performed. In order to avoid this situation, an
operation that notifies the operation administrator of event information according to the remaining
SDP capacity is recommended. For more details on event notification, refer to
(page 100).
• For EC, the data in the copy destination cannot be referenced or updated until the copy session is
suspended. If the monitoring software (ServerView Agents) performs I/O access to the data in the
copy destination, an I/O access error message is output to the server log message and other
destinations. To prevent error messages from being output, consider using other monitoring
methods.
Remote Copy
Remote copy is a function that copies data between different storage systems in remote locations by using the
"REC". REC is an enhancement of the EC mirror suspend method of the local copy function. Mirroring, snapshots,
and backup between multiple storage systems can be performed by using an REC.
This function is not supported in the ETERNUS DX60 S5.
An REC can be used to protect data against disaster by duplicating the database and backing up data to a
remote location.
The older models of the ETERNUS Hybrid Storage Systems and the ETERNUS Disk Storage Systems are
connectable.
●
REC
REC is used to copy data among multiple storage systems using the EC copy method. REC is suitable for the
following usages:
Performing system test data replication
•
• Duplicating databases on multiple ETERNUS AF/DX storage systems
• Backing up data to remote ETERNUS AF/DX storage systems
109
"Event Notification"
Design Guide