Mode Category Description Default MCU/RCU
• Without update I/O: Delta Resync is enabled.
• With update I/O: Delta Resync is enabled.
Mode 506 = OFF (default):
• Without update I/O: Total data copy of Delta Resync is
performed.
• With update I/O: Delta Resync is enabled.
Note: Even when SOM 506 is set to ON, the Delta Resync
may fail and only the total data copy of the Delta Resync
function is allowed if the necessary journal data does not
exist on the primary storage system used for the Delta
Resync operation.
561 ShadowImage
Universal Volume
Manager
Allows Quick Restore for external volumes with different
Cache Mode settings.
Mode 561 = ON: Quick Restore for external volumes with
different Cache Mode settings is prevented.
Mode 561 = OFF (default): Quick Restore for external
volumes with different Cache Mode settings is allowed.
OFF Both
589 Universal Volume
Manager
When this SOM is ON, the frequency of progress update of
disconnection is changed.
Mode 589 = ON: For each external volume, progress is
updated only when the progress rate is 100%.
Mode 589 = OFF (default): Progress is updated when the
progress rate exceeds the previous level.
Notes:
1. Set this SOM to ON when disconnecting an external
volume while the specific host IO operation is online
and its performance requirement is severe.
2. Whether the disconnecting status for each external
volume is progressed or not cannot be confirmed on
Device Manager - Storage Navigator (It indicates “-
“until just before the completion and at the last it
changes to 100%).
OFF Both
689 TrueCopy
global-active
device
Allows you to slow the initial copy and resync operations
when the write-pending rate on the RCU exceeds 60%.
Mode 689 = ON: The initial copy and resync copy operations
are slowed down when the Write Pending rate on RCU
exceeds 60%.
If the CLPR write pending rate where the initial copy target
secondary volume belongs to is not over 60% but that of MP
PCB where the S-VOL belongs to is over 60%, the initial copy
operation is slowed down.
Mode 689 = OFF (default): The initial copy and resync
copy operations are not slowed down when the Write Pending
rate on RCU exceeds 60% (the same as before).
Notes:
1. This SOM can be set online.
OFF Both
360 System option modes
System Administrator Guide for VSP Gx00 models and VSP Fx00 models
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