Fujitsu ETERNUS DX S5 Series - Table 50 Modified Data Size for each Quickopc Resolution; Table 51 Available Cascade Copy Combinations (When a Cascade Copy Performs Session 2 Followed by Session 1)

*2: When issuing a re-copy request for copy session 1 (a request to copy only the data that has been updated after all data is copied),
the modified data size should conform to the sizes shown in Table 50.
For example, when a QuickOPC session is created at a resolution of 2, the modified data size should be less than 2TB. The
"Resolution" for QuickOPC sessions can be checked on the [Advanced Copy (QuickOPC Sessions)] screen.
Table 50 Modified Data Size for Each QuickOPC Resolution
Resolution 1 2 4 8 16 32 64
Modified data size Less than 1TB Less than 2TB Less than 4TB Less than 8TB Less than 16TB Less than 32TB Less than 64TB
If a re-copy request is issued for a larger size, the command for the re-copy request may time out and fail. The current "Modified
Data Size" for copy session 1 can be checked on the [Advanced Copy (QuickOPC Sessions)] screen. If an error occurs for copy session
1, perform one of the following operations instead.
• When performing a continuous Cascade Copy of QuickOPC
After the phase for copy session 2 becomes "Tracking", delete copy session 1. After changing the copy resolution of the
ETERNUS
DX, re-create copy session 1. For details on changing the resolution, refer to the "Modify Copy Table Size" section in "ETERNUS
Web GUI User's Guide".
• 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.
*3: To suspend a Cascade Copy where session 2 is an EC or REC session, perform the Suspend command after the physical copy for copy
session 1 is complete.
*4: A Cascade Copy cannot be performed when a copy source and destination volume is in an older ETERNUS storage system model.
*5: When copy session 1 uses the REC Consistency mode, the data transmission sequence of copy session 1 is guaranteed, but the data
transmission sequence of copy session 2 is not guaranteed.
Table 51 shows the supported combinations when adding a copy session to a copy source volume where a
copy session has already been configured.
Table 51 Available Cascade Copy Combinations (When a Cascade Copy Performs Session 2 Followed by
Session 1)
Copy session
1
Copy session 2
OPC QuickOPC SnapOPC SnapOPC+ EC
REC
synchronous
transmissio
n
REC Stack
mode
REC
Consistency
mode
OPC
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡
QuickOPC
¡ ¡ (*1) ¡ ¡ ¡ ¡ ¡ ¡
SnapOPC
´ ´ ´ ´ ´ ´ ´ ´
SnapOPC+
´ ´ ´ ´ ´ ´ ´ ´
EC
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡
REC
synchronous
transmission
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡
REC Stack
mode
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡
REC
Consistency
mode
¡ ¡ ¡ ¡ ¡ ¡ (*2) ¡ ¡ (*2)
2. Basic Functions
Backup (Advanced Copy)
117 Design Guide