Mode
Category
Description
Default
MCU/RCU
Mode 897 = ON:
•
SOM 898 is OFF: 110%+0IO
•
SOM 898 is ON: 110%+2IO
Mode 897 = OFF (Default)
•
SOM 898 is OFF: 110%+5IO (Default)
•
SOM 898 is ON: 110%+1IO
By setting the SOM s to ON to lower the upper limit for
each tier, the gray zone between other tiers becomes
narrow and the frequency of page allocation increases.
Notes:
1.
Apply the mode when the usage of upper tier is low
and that of lower tier is high.
2.
The mode must be used with SOM 898.
3.
Narrowing the gray zone increases the number of
pages to migrate between tiers per relocation.
4.
When Tier1 is SSD while SOM 901 is set to ON, the
effect of SOM 897 and 898 to the gray zone of Tire1
and Tier2 is disabled and the SOM 901 setting is
enabled instead. In addition, the settings of SOM 897
and 898 are effective for Tire2 and Tier3.
Please also see spreadsheet "SOM 897_898_901" for more
details about the relations between SOM 897, 898 and
901.
898
Dynamic Tiering,
Dynamic Tiering
for Mainframe
I/O value (IOPH) can be changed as follows.
Mode 898 = ON:
•
SOM 897 is OFF: 110%+1IO
•
SOM 897 is ON: 110%+2IO
Mode 898 = OFF (default):
•
SOM 897 is OFF: 110%+5IO (Default)
•
SOM 897 is ON: 110%+0IO
By setting the SOM s to ON to lower the upper limit for
each tier, the gray zone between other tiers becomes
narrow and the frequency of page allocation increases.
Notes:
1.
Apply the mode when the usage of upper tier is low
and that of lower tier is high.
2.
The mode must be used with SOM 897.
3.
Narrowing the gray zone increases the number of
pages to migrate between tiers per relocation.
4.
When Tier1 is SSD while SOM 901 is set to ON, the
effect of SOM 897 and 898 to the gray zone of Tire1
and Tier2 is disabled and the SOM 901 setting is
enabled instead. In addition, the settings of SOM 897
and 898 are effective for Tire2 and Tier3.
Please also see spreadsheet "SOM 897_898_901" for more
details about the relations between SOM 897, 898 and
901.
OFF
164
System option modes
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide
Содержание F1500
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Страница 106: ...106 Site preparation Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
Страница 120: ...120 Troubleshooting Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
Страница 132: ...132 Specifications Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
Страница 182: ...182 System option modes Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
Страница 204: ...204 Glossary Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
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