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Figure 6.10 Cascade Copy; Table 6.4 Available Cascade Copy Combinations - Fujitsu ETERNUS DX80 S2 Overview

Disk storage system
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Chapter 6 Optional Functions
6.2 Backup (Advanced Copy)
●
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
Figure
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.
When a cascade copy is used in combination with the Advanced Copy function of an ETERNUS DX Disk
storage system, the copy destination area for copy session 1 and the copy source area for copy session 2
must be identical.

Figure 6.10 Cascade copy

Copy source
: Copy session 1
: Copy session 2
Table 6.4
shows the supported combinations of copy sessions for cascade copies.
Table 6.4
Copy
session 2
OPC (*2)
QuickOPC (*2)
SnapOPC (*2)
SnapOPC+
(*2)
EC
REC
synchronous
transmission
REC Stack
mode
REC
Consistency
mode
*1:
When copy session 1 is an EC or REC session, suspending copy session 1 is recommended to set copy session 2.
*2:
When copy session 2 is an OPC, QuickOPC, SnapOPC, or SnapOPC+ session, data in the copy destination of copy
session 1 is backed up. Data is not backed up in the copy source of copy session 1.
6.10, "Copy session 1" refers to a copy session in which the copy destination area is also
OPC, QuickOPC,
OPC, QuickOPC,
SnapOPC, SnapOPC+,
EC, or REC
EC, or REC
Copy destination + Copy source
Available cascade copy combinations
OPC
Quick
OPC
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
(*3)
(*3)
Yes
Yes
Yes
Yes
(*3)
(*3)
ETERNUS DX80 S2/DX90 S2 Disk storage system Overview
Copyright 2013 FUJITSU LIMITED
Copy destination
Copy session 1
Snap
Snap
EC (*1)
OPC
OPC+
No
No
Yes
No
No
Yes
No
No
Yes
No
No
Yes
No
No
Yes
Yes
No
No
(*3)
No
No
Yes
Yes
No
No
(*3)
88
REC
REC
REC
synchro-
Stack
Consist-
nous
mode
ency
trans-
(*1)
mode
mission
(*1)
(*1)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
(*3)
(*3)
(*3) (*4)
Yes
Yes
Yes
Yes
Yes
Yes
(*3)
(*3) (*4)
P3AM-4812-11ENZ0

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