Fujitsu Eternus DX100 S3 User Manual page 395

Chapter 4 Copy Function Settings and Display
4.1 Advanced Copy Management
• The same bitmap ratio (M) value must be used by both the copy source device and copy destination
device. If the bitmap ratio settings for the copy source and copy destination devices are different, REC
cannot be performed. Note that the table sizes (S) do not need to be identical. If different
recommended resolutions are calculated for the copy source and copy destination devices, use
whichever resolution is greater for both devices. If the resolution (M) is changed, recalculate the table
size (S) setting for the device with the new resolution.
• The table size for OPC / QuickOPC / SnapOPC / SnapOPC+ without EC / REC and 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 OPC / QuickOPC / SnapOPC / SnapOPC+ without EC / / REC and
OPC Restoration (*1)
N1: The number of sessions for OPC / QuickOPC / SnapOPC / SnapOPC+ without EC / REC and OPC
Restoration
S1 [MB] = ((2  C1 / M) + N1)  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  C2 / M) + N2)  2  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.
The copy capacity for multi-copy sessions and for generation management by SnapOPC+ sessions is the
total capacity of copy source volumes (slices or partitions), multiplied by the number of copy destinations
(or generations) for each copy source.
Example:
A
Copy area in the copy source logical volume A: 200M,
number of copy destinations (generations): 4
Copy area in the copy source logical volume B: 500MB,
number of copy destinations (generations): 8
Add 200  4 + 500  8 = 4800MB to the copy capacity (C1).
The number of copy sessions (N1) is 4 + 8 = 12.
When executing OPC Restoration from a copy destination with multi-copy and SnapOPC+
multigeneration enabled, select one copy destination and apply the above formula. Other
copy destinations are calculated as being normal multi-copy and SnapOPC+ multi-
generation.
ETERNUS CLI User's Guide
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