Specifications

ES/OL
Evaluator Series On-Line™
Storage Systems
Product Analysis
May, 2011
Page 22 of 30
Analysis of Fujitsu ETERNUS DX400 S2
Models DX410 and DX440
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Data Protection Software
Fujitsu has termed their point in time copy feature for the ETERNUS series, One Point Copy (OPC). There
is local mirroring (Equivalent Copy), along with three different versions of One Point Copy:
• One Point Copy (OPC)
• Quick OPC
• Snap OPC
Equivalent Copy
One Point Copy (OPC)
One Point Copy
QuickOPC
SnapOPC
Copy Type
Mirror
Clone
Clone
PIT
Architecture
Full Copy
Bit Map
Bit Map
Bit Map
Max # Copies
32/volume Maximum concurrent EC, OPC, QOPC or SnapOPC copy sessions:
8192
Re-sync
Yes
No
Yes
No
Potential Data
Exposure
Synchronous—none
Exposure is back to
time OPC was
activated
Exposure is back to
time QuickOPC was
activated
Exposure is back to
time when snap was
taken
Availability for
Restore
Mirror available after
completion of initial
mirror
Available for restore
immediately, or able
to replace volume
after copy complete
Available for restore,
or able to replace
volume immediately
Available for restore
only after command
completes
DR, Fail-over
Capability
Yes
On Mirror suspend
or break
Yes
Able to replace
volume after copy
complete
Yes
Able to replace
volume as soon as
command completes
No
Not for DR or fail-
over, depends on
source data
Default Action
Mirror. Copy is a
true mirror until it is
split
Copy when
command issued
Copy when command
issued
Copy on Write
Additional
Capacity
100%
100%
100%
Changes only
Access to Copy
R/W after split
R/W immediate
R/W immediate
R/O
Performance
Impact
Some impact
Small Impact
Minimal
Minimal
Table 7: Fujitsu ETERNUS DX400 S2 Data Protection Options
Note: The maximum number of copy sessions is based on cache available for management of the copy
sessions or a maximum of 8192. Cache usage is determined by the size of the volumes being replicated, the
number of volumes being replicated and the resolution of the bitmap. The maximum total copy sessions or 32
copy sessions per volume are not available for all configurations.