HP XP P9500 Owner's Manual page 27

Table 1 1 System option modes (continued)
Mode Category
448 Continuous Access
Journal
Continuous Access
Journal Z
449 Continuous Access
Journal
Continuous Access
Journal Z
454 Cache Partition
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Description
Mode 448 = ON: (Enabled)
If the SVP detects a blocked path, the SVP assumes that an error
occurred, and then immediately splits (suspends) the mirror.
Mode 448 = 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.
Detecting and monitoring path blockade between MCU and RCU
of Universal Replicator/Universal Replicator for z/OS
<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.
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 SOM 454 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 CLPRs
Because 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 destage
processing becomes.)
*b: (Write Pending capacity of the entire system) ÷ (Cache
capacity of the entire system)
Because the destage processing would not be accelerated even
if CLPR has high workload, when the workload in a specific CLPR
increases, the risk of host I/O halt would be increased. Therefore,
it is limited to set Mode 454 to ON only when a CLPR has
constant high workload and it gives priority to I/O
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System option modes, host modes, and host mode options
Default MCU/RCU
OFF
OFF
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