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) - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
Backup (Advanced Copy)
*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
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
Resolution
Modified data size
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
OPC
QuickOPC
SnapOPC
SnapOPC+
EC
REC
synchronous
transmission
REC Stack
mode
REC
Consistency
mode
Modified Data Size for Each QuickOPC Resolution
1 2
Less than 1TB Less than 2TB
Copy session 2
OPC QuickOPC SnapOPC
¡ ¡ ¡
¡ (*1)
¡ ¡
´ ´ ´
´ ´ ´
¡ ¡ ¡
¡ ¡ ¡
¡ ¡ ¡
¡ ¡ ¡
Table 50.
4 8 16
Less than 4TB Less than 8TB Less than 16TB
REC
synchronous
SnapOPC+ EC
transmissio
n
¡ ¡ ¡
¡ ¡ ¡
´ ´ ´
´ ´ ´
¡ ¡ ¡
¡ ¡ ¡
¡ ¡ ¡
¡ (*2)
¡ ¡
117
32 64
Less than 32TB Less than 64TB
REC
REC Stack
Consistency
mode
mode
¡ ¡
¡ ¡
´ ´
´ ´
¡ ¡
¡ ¡
¡ ¡
¡ (*2)
¡
Design Guide