Fujitsu Eternus DX200F, User Manual

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Appendix A Parameter List
A.7 Advanced Copy Management
ETERNUS Web GUI User’s Guide (Settings)
Copyright 2015 FUJITSU LIMITED P2X0-1270-13ENZ0
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A.7.2 Modify EC/OPC Priority
For details about this function, refer to "7.5 Modify EC/OPC Priority" (page 600) .
For the factory default settings for this function, refer to "Appendix B Modify EC/OPC Priority" (page 1009) .
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EC/OPC Priority
• EC/OPC Priority
●
Advanced Setting
• Copy Schedule Mode
Description Set the EC/OPC priority.
Input condition/
Display contents
•
Automatic Priority
This mode changes the EC/OPC priority automatically in response to the operating
load status.
•
High Priority
This mode operates by making maximum use of internal resources.
This mode greatly affects host access performance, thus should not be used during
normal operation. Use when the operation load is low.
•
Middle Priority
This mode operates slightly slower than the High Priority mode.
Select this mode when performance is greatly affected by the High Priority mode,
but the copy speed is too slow with the Low Priority mode.
•
Low Priority
This mode reduces the effect on host access.
Select this mode when using EC and/or OPC during operation.
•
Very Low Priority
This mode operates slower than the Low Priority mode.
Select this mode when performance is affected (such as when the performance of
host response is reduced) by the Automatic Priority or Low Priority mode.
Description Specify the schedule mode for EC, OPC, and Quick OPC.
It is not necessary to change the default setting (Session Balancing) for normal use.
Setting the schedule mode for SnapOPC and S is not required.
Use the procedure in
"7.8.11 Modify REC Multiplicity" (page 656) to specify the REC
schedule mode.
Input condition/
Display contents
•
Session Balancing
Copy sessions are scheduled evenly to each Controlling CM for a copy source RAID
group (a RAID group to which the copy source volume belongs).
•
Destination RAID Group Balancing
Only one copy session can be performed for each copy destination RAID group. This
method prevents unequal loading on a specific RAID group. This may improve the
copy performance when a copy destination RAID group is configured by Nearline
disks or when "High Priority" is set for EC/OPC.
Copy performance is not improved by selecting "Destination RAID Group Balancing" in the following conditions:
•
When the type of the copy destination volume is not "Standard"
•
When the copy destination volume "Standard" and concatenated