Mode Category Description Default MCU/RCU
900 Volume
Migr
ation
In combination with SOM 899 setting, this SOM
determines whether to execute and when to start
the I/O synchronous copy change as follows.
Mode 900 = ON:
â–
SOM 899 is ON: I/O synchronous copy starts
without retrying Volume Migration.
â–
SOM 899 is OFF: I/O synchronous copy starts
when the number of retries reaches half of the
threshold of Volume Migration retry.
Mode 900 = OFF (default):
â–
SOM 899 is ON: I/O synchronous copy starts when
the threshold of Volume Migration retry is
exceeded. (Recommended)
â–
SOM 899 is OFF: Volume Migration is retired and
I/O synchronous copy is not executed.
Notes:
1. This SOM is applied when improvement of
Volume Migration success rate is desired under
the condition that there are many updates to a
migration source volume of Volume Migration.
2. During I/O synchronous copy, host I/O
performance degrades.
OFF -
System option modes
Appendix B: System option modes
System Administrator Guide for VSP Gx00 models and VSP Fx00 models 326
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