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Chapter 8 Advanced Copy Management
8.2 Functions in the Action Area for Advanced Copy
ETERNUS Web GUI User’s Guide
Copyright 2013 FUJITSU LIMITED P2X0-1090-10ENZ0
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2 Select the EC/OPC priority, and click the [Set] button.
• EC/OPC Priority
- 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.
● Advanced Setting
• Copy Schedule Mode
Specify the schedule mode for EC, OPC, and Quick OPC. Use "Session Balancing" for normal
operation.
Setting the schedule mode for SnapOPC and SnapOPC + is not required.
Use the [Modify REC Multiplicity] function to specify the REC schedule mode.
- Session Balancing
Copy sessions are scheduled evenly to each controlling CM-CPU 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 pre-
vents 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