Fujitsu ETERNUS DX500 S4/DX600 S4 Design Manual page 92

2. Basic Functions
Backup (Advanced Copy)
*1: The difference between SnapOPC and SnapOPC+ is that SnapOPC+ manages the history of updated data as
opposed to SnapOPC, which manages updated data for a single generation only. While SnapOPC manages
updated data in units per session thus saving the same data redundantly, SnapOPC+ has updated data as
history information which can provide multiple backups for multiple generations.
●
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 be-
tween the copy source data and the copy destination data. EC is suitable for the following usages:
• Performing a backup
Performing system test data replication
•
Prepare an encrypted SDP 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
For EC, the data in the copy destination cannot be referenced or updated until the copy session is suspen-
•
ded. 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.
FUJITSU Storage ETERNUS DX500 S4/DX600 S4, ETERNUS DX500 S3/DX600 S3 Hybrid Storage Systems Design Guide (Basic)
"Event Notification" (page
92
Copyright 2019 FUJITSU LIMITED
84).
P3AM-7722-25ENZ0