Mode Category Description Default
MCU/R
CU
does not work if it is set during the Split/Resync
operation
278 Open Tru64 (Host Mode 07) and OpenVMS (Host Mode 05)
Caution: Host offline: Required
OFF -
292 HRC When mode 114 is on and the host is connected with the
CNT-made FC switch (FC9000 etc.), and is using TrueCopy
S/390 with Open Fibre connection, the Link Incident
Report for the host from the FC switch will be deterred
when switching the CHT port attribute (including
automatic switching when executing CESTPATH and
CDELPATH
Mode292=ON: When switching the port attribute, issue
the OLS (100ms) first, and then reset the Chip.
Mode292=OFF (default): When switching the port
attribute, reset the Chip without issuing the OLS.
OFF Both
448 Universal
Replicator
ON: (Enabled) If the SVP detects a blocked path, the SVP
assumes that an error occurred, and then immediately
splits (suspends) the mirror. OFF: (Disabled) 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.
OFF
449 Universal
Replicator
Detecting and monitoring path blockade between MCU and
RCU of Universal Replicator<Functionality> - Mode 449
on: Detecting and monitoring of path blockade will NOT be
performed.- Mode 449 off (default *) : Detecting and
monitoring of the path blockade will be performed.* Newly
shipped DKC will have Mode 449 = ON as default.Note:
The mode status will not be changed by the microcode
exchange.
454 Virtual Partition
Manager
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 SOM454
is set to ON or OFF. Mode 454 = OFF (default):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: (Write
Pending capacity of CLPR#x) ÷ (Cache capacity of
CLPR#x), x=0 to 31 CLPR whose value above is the
highest of all CLPRsBecause the destage processing would
be accelerated depending on CLPR with high workload,
when the workload in a specific CLPR increases, the risk of
host I/O halt would be reduced. Therefore, set Mode 454
to OFF in most cases. Mode 454 = ON:The amount of the
entire destage processing is periodically determined by
using the workload of the entire system (*b). (The larger
the workload is, the larger the amount of the entire
OFF -
B-4
System option modes
Hitachi Unified Storage VM Block Module Hardware User Guide
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