Mode Category Description Default MCU/RCU
• 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.
Notes:
1. When all the following conditions are met, set Mode
64=ON.
2. When all the following conditions are met, set Mode
64=ON.
- Customer requests to stop the update I/O operation
to the RCU of a TrueCopy for Mainframe pair for the
whole subsystem.
- Disaster Recovery function such as GDPS,
HyperSwap, or Fail Over/ Fail Back, which requires
compatibility with IBM storage, is not used as this
Mode 64 operates without having compatibility with
IBM storage.
- Only Peer-to-Peer-Remote-Copy operation. (Do not
use it in combination with Business Continuity
Manager.)
3. Even though the Failover command is not an
applicable criterion, when executing the Failover
command while Mode 114 is ON, since ports are not
automatically switched, the Failover command fails.
4. With increase of Sync pairs in subsystem, the time
period to report the completion of Freeze command
136 System option modes
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide
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