Hitachi Virtual Storage Platform G400 - Page 337

Mode Category Description Default MCU/RCU
1067 Universal
Replicator
This SOM is used to enable microcode downgrade to
a version that does not support
URxUR (including
delta).
Mode 1067 = ON: Even when a UR pair has been
registered, downgrading the microcode to a version
that does not support URxUR (including delta) is
allowed.
Mode 1067 = OFF (default): If any UR pair has been
registered, downgrading the microcode to a version
that does not support URxUR (including delta) is not
allowed.
Notes:
1. This SOM is applied to enable microcode
downgrade to a version that does not support
URxUR (including delta) if the conguration
where any UR pair has been registered is not
URxUR (including delta).
2. Setting this SOM to ON allows microcode
downgrade at sites where only 1 mirror is used
in URxUR multi-target conguration without
delta resync and cascade conguration (L or R
site in multi-target, and P or R site in cascade),
but the following phenomena occur after
microcode downgrade. Make sure that the
target storage system does not contain pairs of
URxUR conguration.
Phenomena:
1. When the microcode is downgraded at S
site (local or remote) in multi-target
conguration, the pair between P site and
the target S site cannot be resynchronized.
2. When the pair between I site and R site in
cascade conguration is resynchronized,
the pair status cannot change from COPY
to PAIR.
3. When the microcode is downgraded at R
site in cascade conguration, the pair
between I site and R site cannot be
resynchronized.
OFF Both
System option modes
Appendix B: System option modes
System Administrator Guide for VSP Gx00 models and VSP Fx00 models 337