Hitachi Virtual Storage Platform G400, Reference Manual

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If the SVP detects a blocked path and the path does not
recover within the specified period of time, the SVP
assumes that an error occurred, and then splits (suspends)
the mirror.
Note:
The mode 448 setting takes effect only when mode 449 is
set to OFF.
449
This mode is used to enable and disable detection of
communication failures between MCU and RCU.
Mode 449 = ON
On MCU side, checking read journal disruption from RCU is
disabled, and monitoring read journal failures is disabled on
RCU side.
Mode 449 = OFF
Detecting communication failures between MCU and RCU is
enabled.
Notes:
(1) The mode applies at sites where disabling the detection
of communication failures between MCU and RCU in UR
configuration is required.
(2) For USP/NSC, the default setting is OFF with versions
from 50-03-95-00/00 to 50-04-31-00/00, and is ON with
versions 50-04-40-00/00 and later.
(3) When the mode is set to ON, System Option Mode 448
does not work.
(4) The mode setting is not changed by microcode upgrade.
(5) The mode is not effective for remote paths between
Initiator port on MCU and Target port on RCU.
(6) While a path from RCU to MCU is disconnected, if the UR
pair remains in Suspending or Deleting status, recover it in
accordance with the procedure in Recovery from UR Failure
in TROUBLE SHOOTING section of the Maintenance Manual.
ON
454
CLPR (Function of Virtual Partition Manager) partitions the
cache memory in the disk subsystem into multiple virtual
cache and assigns the partitioned virtual cache for each use.
If a large amount of cache is required for a specific use, it
can minimize the impact on other uses. The CLPR function
works as follows depending on whether System Option
Mode 454 is set to ON or OFF.
Mode 454 = OFF:
The amount of the entire destage processing is periodically
determined by using the highest workload of all CLPRs (*a).
(The larger the workload is, the larger the amount of the
entire destage processing becomes.)
*a:
(for HUS VM)
OFF
System option modes 53
Hitachi Virtual Storage Platform G400, G600 Hardware Reference Guide