Mode
Category
Description
Default
MCU/RCU
•
the requirement for response time is severe.
2.
The number of pages to be migrated per unit time at
tier relocation decreases.
908
Universal
Replicator
Universal
Replicator for
Mainframe
The mode can change CM capacity allocated to MPBs with
different workloads.
Mode 908 = ON:
The difference in CM allocation capacity among MPBs with
different workload is large.
Mode 908 = OFF (default):
The difference in CM allocation capacity among MPBs with
different workload is small (existing operation)
Notes:
1.
1. The mode is applied to a CLPR only used for UR
JNLGs.
2.
2. Since CM capacity allocated to MPBs with low load
is small, the performance is affected by a sudden
increase in load.
OFF
930
Dynamic
Provisioning
Hitachi Thin
Image
When the mode is set to ON, all of the zero data page
reclamation operations in processing are stopped. (Also the
zero data page reclamation cannot be started.)
* Zero data page reclamation by WriteSame and UNMAP
functions, and IO synchronous page reclamation are not
disabled.
Mode 930 = ON:
All of the zero data page reclamation operations in
processing are stopped at once. (Also the zero data
reclamation cannot be newly started.)
Mode 930 = OFF (default):
The zero data page reclamation is performed.
See sheet "SOM 930" for relationship with SOM 755 and
SOM 859.
Notes:
1.
The mode is applied when stopping or disabling zero
data page reclamation by user request is required.
2.
When the mode is set to ON, the zero data page
reclamation does not work at all.
•
Zero data page reclamation by Write Same and
UNMAP, and IO synchronous page reclamation can
work.
3.
When downgrading micro-program to a version that
does not support the mode while the mode is set to
ON, set the mode to OFF after the downgrade
•
Because the zero data page reclamation does not
work at all while the mode is set to ON.
4.
The mode is related to SOM 755 and SOM 859.
OFF
937
Dynamic
Provisioning
By setting the mode to ON, HDT monitoring data is
collected even if the pool is a HDP pool.
OFF
System option modes
167
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide