Mode
Category
Description
Default
MCU/RCU
•
SIM-RC 601xxx (Pool utilization threshold excess)/
603000 (SM Space Warning) (70-05-0x-00/00 or
higher)
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.
Notes:
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 15µs per
command.
3.
If this mode is set to ON, the processing speed of
update I/O slows down by about 15µs 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.
5.
While the mode is set to ON, make sure not to
perform micro-program downgrade to an
unsupported version.
OFF
MCU/RCU
144
System option modes
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide