Figure 56 Multi-Copy (Case 1: When Performing A Cascade Copy For An Rec Session In Consistency Mode); Figure 57 Multi-Copy (Case 2: When Performing A Cascade Copy For An Rec Session In Consistency Mode) - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
Backup (Advanced Copy)
When performing a Cascade Copy for an REC session in Consistency mode, the copy source of the session
must not be related to another REC session in Consistency mode with the same destination storage system.
Figure 56
ETERNUS AF/DX
OPC / QuickOPC / EC
Copy source
Figure 57
ETERNUS AF/DX
OPC / QuickOPC / EC
Copy source
●
Cascade Copy
A copy destination with a copy session that is set can be used as the copy source of another copy session.
A Cascade Copy is performed by combining two copy sessions.
In Figure 58, "Copy session 1" refers to a copy session in which the copy destination area is also used as the
copy source area of another copy session and "Copy session 2" refers to a copy session in which the copy
source area is also used as the copy destination area of another copy session.
For a Cascade Copy, the copy destination area for copy session 1 and the copy source area for copy session 2
must be identical or the entire copy source area for copy session 2 must be included in the copy destination
area for copy session 1.
Multi-Copy (Case 1: When Performing a Cascade Copy for an REC Session in Consistency Mode)
REC (Consistency)
REC (Consistency)
REC (Consistency)
Multi-Copy (Case 2: When Performing a Cascade Copy for an REC Session in Consistency Mode)
REC (Consistency)
REC (Consistency)
REC (Consistency)
ETERNUS AF/DX
Copy
destination 1
Copy
2
destination
ETERNUS AF/DX
Copy
destination 3
ETERNUS AF/DX
Copy
destination 1
Copy
destination 2
ETERNUS AF/DX
Copy
destination 3
115 Design Guide