Figure 48 Cascade Copy; Table 24 Available Cascade Copy Combinations (When A Cascade Copy Performs Session 1 Followed By Session 2) - Fujitsu ETERNUS DX60 S4 Design Manual

1. Function
Backup (Advanced Copy)
A Cascade Copy can be performed when all of the target volumes are the same size or when the copy destination
volume for copy session 2 is larger than the other volumes.

Figure 48 Cascade Copy

OPC/QuickOPC/EC
1
Copy source
OPC/QuickOPC/EC
1
Copy source
: Copy session 1
: Copy session 2
Table 24 shows the supported combinations when adding a copy session to a copy destination volume where a
copy session has already been configured.

Table 24 Available Cascade Copy Combinations (When a Cascade Copy Performs Session 1 Followed by Session 2)

Copy session 2
OPC
QuickOPC
SnapOPC
SnapOPC+
EC
¡: Possible, ´: Not possible
*1: When copy session 2 is an OPC, QuickOPC, SnapOPC, or SnapOPC+ session, data in the copy destination of
copy session 1 is backed up. Data is not backed up in the copy source of copy session 1.
*2: This combination is supported only if the copy size in both the copy source volume and the copy destina-
tion volume is less than 2TB.
If the copy size is 2TB or larger, perform the following operations instead.
When performing a temporary recovery
•
Use a Cascade Copy of QuickOPC (copy session 1) and OPC (copy session 2).
When backing up two generations
•
Use a multi-copy that is configured with QuickOPC and QuickOPC.
FUJITSU Storage ETERNUS DX60 S4, ETERNUS DX60 S3 Hybrid Storage Systems Design Guide (Basic)
OPC/QuickOPC/
SnapOPC/SnapOPC+/EC
2
Copy destination and source
OPC/QuickOPC/
SnapOPC/SnapOPC+/EC
2
Copy destination and source
Copy session 1
OPC QuickOPC
¡ (*1) ¡ (*1)
¡ (*1) ¡ (*1) (*2)
¡ (*1) ¡ (*1)
¡ (*1) ¡ (*1)
¡ ¡
Copyright 2019 FUJITSU LIMITED
Copy destination
Copy destination
SnapOPC
´
´
´
´
´
77
SnapOPC+ EC
´
¡
´
¡
´
¡
´
¡
´
¡
P3AM-8992-14ENZ0