Functional and Operational Characteristics
2–19
Hitachi VSP User and Reference Guide
474 Universal
Replicator,
Universal
Replicator for
Mainframe
UR initial copy performance can be improved by
issuing a command from Raid Manager/BC Manager
to execute a dedicated script consists of UR initial
copy (Nocopy), UR suspend, TC (Sync) initial copy,
TC (Sync) delete, and UR resync.
Mode 474 = ON:
For a suspended UR pair, a TC-Sync pair can be
created with the same P-VOL/S-VOL so that UR
initial copy time can be reduced by using the
dedicated script.
Mode 474 = OFF (default):
For a suspended UR pair, a TC-Sync pair cannot be
created with the same P-VOL/S-VOL. For this, the
dedicated script cannot be used.
Note:
1. Set this mode for both MCU and RCU.
2. When the mode is set to ON;
- Execute all of pair operations from Raid Manager/
BCM.
- Use a dedicated script.
- Initial copy operation is prioritized over update I/
O. Therefore, the processing speed of the update I/
O slows down by about 15?s per command.
3. If this mode is set to ON, the processing speed of
update I/O slows down by about 15?s per
command, version downgrade is disabled, and Take
Over is not available.
4. If the mode is not set to ON for both or either
sides, the behavior is as follows.
- Without setting on both sides: Normal UR initial
copy performance.
- With setting on MCU/without setting on RCU: TC
Sync pair creation fails.
- Without setting on MCU/with setting on RCU: The
update data for P-VOL is copied to the S-VOL in
synchronous manner.
- While the mode is set to ON, micro-program
downgrade is disabled.
- While the mode is set to ON, Take Over function is
disabled.
- The mode cannot be applied to a UR pair that is
the 2nd mirror in URxUR multi-target configuration
or URxUR cascade configuration. If applied, TC pair
creation is rejected with SSB=CBEE output.
OFF MCU/RCU
Mode Category Description Default MCU/RCU
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