Fujitsu Eternus DX100 S3 User Manual page 394

Chapter 4 Copy Function Settings and Display
4.1 Advanced Copy Management
■ Copy parameter settings (required)
Set the internal table size to match the capacity of the volume to be copied, and the copy speed in the device.
Copy table size (table size) and resolution vary according to the copy capacity and number of sessions that are
operated at the same time.
●
Resolution
This value determines the amount of data each bit in the copy bitmap represents.
The allowed resolution settings of "1 (standard)", "2", "4", "8", "16", "32", and "64" respectively give 8KB,
16KB, 32KB, 64KB, 128KB, 256KB, and 512KB regions of data per bitmap bit. The same value is used for all
the copy sessions in the ETERNUS DX.
Set the resolution as small as possible. When a large value is specified, the performance may be reduced.
When unsure about whether the copy target area might be increased in future use, specify the maximum
resolution.
To change the resolution of a copy session that is currently being performed, cancel the copy session and
start again.
●
Internal table size
A dedicated memory area is required for Advanced Copy management and is allocated as a table size. The
table size and resolution settings are determined by the copy capacity and the number of sessions
(volumes) that will be run simultaneously.
(Table size (S)) [MB] = (S1) + (S2)
S1: Refers to the table size (MB) for OPC / QuickOPC / SnapOPC / SnapOPC+ without EC/REC and OPC
Restoration.
S2: Refers to the table size (MB) for OPC / QuickOPC / SnapOPC / SnapOPC+ with OPC Restoration.
• Round the derived value up to the next multiple of 8 to obtain the correct setting for the copy table
size.
• A copy table of the appropriate size (as derived above) is created in each CM.
• If the total table size value (S) exceeds the maximum size allowed, adjust the resolution (M) upward
until the maximum table size is no longer exceeded. The resolution (M) should be as small as
possible.
• Maximum allowed table sizes are as follows:
ETERNUS DX100 S3
ETERNUS DX200 S3
ETERNUS DX500 S3
ETERNUS DX600 S3
ETERNUS DX200F
• Allowance should be made for possible increases in the copy capacity.
• If the resolution is changed while a copy session exists, the changed resolution is only applied to copy
sessions that are set after the resolution is changed. A copy session that is set before the resolution
changes uses the resolution that is set before it is changed.
Device name
394
ETERNUS CLI User's Guide
Copyright 2014 FUJITSU LIMITED
Maximum copy table size (per CM)
512MB
512MB
1024MB
4096MB
512MB
P2X0-1210-05ENZ0