Table 36 Available Cascade Copy Combinations (When A Cascade Copy Performs Session 2 Followed By Session 1) - Fujitsu ETERNUS AF250 Design Manual

1. Function
Backup (Advanced Copy)
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: A Cascade Copy cannot be performed when a copy source and destination volume is in an older ETERNUS
storage system model.
*4: 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 36 shows the supported combinations when adding a copy session to a copy source volume where a copy
session has already been configured.

Table 36 Available Cascade Copy Combinations (When a Cascade Copy Performs Session 2 Followed by Session 1)

Copy session 2
Copy session
1
OPC
OPC
¡
QuickOPC
¡
SnapOPC ´
´
SnapOPC+
EC
¡
REC synchro-
¡
nous trans-
mission
REC Stack
¡
mode
REC Consis-
¡
tency mode
¡: Possible, ´: Not possible
*1: 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.
*2: 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.
QuickOPC SnapOPC
¡ ¡
¡ (*1)
¡
´ ´
´ ´
¡ ¡
¡ ¡
¡ ¡
¡ ¡
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
REC syn-
chronous
SnapOPC+ EC
transmis-
sion
¡ ¡ ¡
¡ ¡ ¡
´ ´ ´
´ ´ ´
¡ ¡ ¡
¡ ¡ ¡
¡ ¡ ¡
¡ (*2)
¡ ¡
98
REC Stack REC Consisten-
mode cy mode
¡ ¡
¡ ¡
´ ´
´ ´
¡ ¡
¡ ¡
¡ ¡
¡ (*2)
¡
P3AG-1822-09ENZ0