Fujitsu ETERNUS DX60 S3 User Manual page 607

Chapter 7 Advanced Copy Management
7.6 Modify Copy Table Size
The calculated parameters are "Resolution (M)" and "Table Size (S)". It is assumed that almost 100% of the
copy table size is used.
●
The table size for EC/REC and for OPC/QuickOPC/SnapOPC/SnapOPC+ without OPC Restoration (S1)
M: Resolution (The same value is used in the ETERNUS DX. Set "x1" if possible.)
C1: The total copy capacity (GB) for EC/REC, and OPC/QuickOPC/SnapOPC/SnapOPC+ without OPC
Restoration (*1)
N1: The number of sessions EC/REC, and OPC/QuickOPC/SnapOPC/SnapOPC+ without OPC Restoration.
S1 [MB] = ((2 x C1 / M) + N1) x 8 [KB] / 1024 (Round up decimal point)
●
The table size for OPC/QuickOPC/SnapOPC/SnapOPC+ with OPC Restoration (S2)
M: Resolution (The same value is used in the ETERNUS DX. Set "x1" if possible.)
C2: The total copy capacity (GB) for OPC/QuickOPC/SnapOPC/SnapOPC+ with OPC Restoration in the
volume (*1)
N2: The number of sessions for OPC/QuickOPC/SnapOPC/SnapOPC+ with OPC Restoration
S2 [MB] = ((2 x C2 / M) + N2) x 2 x 8 [KB] / 1024 (Round up decimal point)
*1: For EC, OPC, QuickOPC, SnapOPC, SnapOPC+, and REC copy sources, the copy capacity is the total capacity of all
volumes (slices or partitions) in the ETERNUS DX that are defined as copy sources. For REC copy destinations, the
copy capacity is the total capacity of all the volumes (slices or partitions) in the ETERNUS DX that are defined as
copy destinations.
If the ETERNUS DX is used for both the " EC, OPC, QuickOPC, SnapOPC, SnapOPC+, or REC copy source" and the "
REC copy source", the copy capacity is the total capacity of both.
For multi-copy sessions, the copy capacity is the total capacity of multi-copy source volumes (slices or partitions),
multiplied by the number of multi-copy destinations for each copy source. The copy capacity for generation man-
agement by SnapOPC+ sessions is the total capacity of copy source volumes (slices or partitions) multiplied by
the number of generations in the copy destination volumes for each copy source.
Example for multi-copy sessions:
A
Copy area in the copy source logical volume A: 200 MB, Number of multi-copy destinations: 4
Copy area in the copy source logical volume B: 500 MB, Number of multi-copy destinations: 8
Add 200 x 4 / 500 x 8 = 4800 MB to the copy capacity (C1).
Note that "4" and "8" in this example correspond to the number of generations when calculating the copy table
size for SnapOPC+ sessions.
The number of sessions (N1) for multi-copy and SnapOPC+ is 4 + 8 = 12.
When executing OPC Restoration from a copy destination with multi-copy and SnapOPC+ multi-generation
enabled, select one copy destination and apply the above formula. Other copy destinations are calculated as
being normal multi-copy and SnapOPC+ multi-generation.
B
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