Figure 59 Cascade Copy (Using Three Copy Sessions) - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
Backup (Advanced Copy)
• If a Cascade Copy performs session 1 before session 2, and copy session 1 is an OPC or QuickOPC
session, the logical data in the intermediate volume when copy session 2 is started (the copy
destination volume for copy session 1) is copied to the copy destination volume for copy session 2. A
logical data copy is shown below.
: Copy session 1
: Copy session 2
A Cascade Copy that uses the three copy sessions can be performed with the following configuration.
Figure 59
OPC/QuickOPC/EC
Copy source
: Copy session 1
: Copy session 2
: Copy session 3
OPC / QuickOPC
OPC / QuickOPC /
SnapOPC /
SnapOPC+ /
EC / REC
Cascade Copy (Using Three Copy Sessions)
REC
(Stack mode)
Copy destination
and source
OPC/QuickOPC/
SnapOPC/SnapOPC+/
EC
Copy destination Copy destination
and source
119 Design Guide