Hitachi VSP User and Reference Guide
2–10
Functional and Operational Characteristics
64 TrueCopy for
Mainframe
Mode 64 = ON:
• When receiving the Freeze command, in the
subsystem, pair volumes that fulfill the
conditions below are suspended and the status
change pending (SCP) that holds write I/Os
from the host is set. The path between MCU and
RCU is not deleted. Query is displayed only but
unusable.
• When receiving the RUN command, the SCP
status of the pairs that fulfill the conditions
below is released.
• When a Failure Suspend occurs when Freeze
Option Enable is set, except the pair in which
the Failure Suspend occurs, other pairs that
fulfill conditions below go into SCP state:
- TrueCopy Sync M-VOL
- Mainframe Volume
- Pair status: Duplex/Pending
Mode 64 = OFF (default):
• When receiving the Freeze command, pairs that
fulfill the conditions below are suspended and
the SCP is set. In the case of CU emulation type
2105/2017, the path between MCU and RCU is
deleted, while the path is not deleted but
unusable with Query displayed only in the case
of CU emulation type 3990.
• When receiving the RUN command, the SCP
status of the pairs that fulfill the conditions
below is released.
• When a Failure Suspend occurs while the Freeze
Option Enable is set, except the pair in which
the Failure Suspend occurs, other pairs that
fulfill the conditions below go into SCP state.
Conditions:
•TrueCopy Sync M-VOL
• Mainframe Volume
• Pair status: Duplex/Pending
• A pair whose RCU# is identical to the RCU for
which the Freeze command is specified.
Mode Category Description Default MCU/RCU
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