Set this mode to ON when it is required to inform
maintenance personnel of the SIM-RC(*).
* SIMs reported by setting the mode to ON are as follows.
- HUS VM:
SIM-RC 601xxx (Pool utilization threshold excess)/ 603000
(SM Space Warning)
474
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:
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.
5. While the mode is set to ON, make sure not to perform
micro-program downgrade to an unsupported version.
6. While the mode is set to ON, make sure not to perform
the Take Over function.
OFF
System option modes 61
Hitachi Virtual Storage Platform G800 Hardware Reference Guide
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