Mode
Category
Description
Default
MCU/RCU
performance limitation exceedance, allocation is done from
highly loaded pages until reaching the capacity limit
When the capacity of the tier1 reaches the threshold value,
the minimum value of the tier range is set to the starting
value of the lower IOPH zone, and the maximum value of
the lower tier range is set to the boundary value.
Mode 901 = OFF (default):
For tier1 (drive type is SSD), page allocation is performed
based on performance potential limitation. With
consideration of performance limitation exceedance,
allocation is done from highly loaded pages but at the point
when the performance limitation is reached, pages are not
allocated any more even there is free space.
When the capacity of the tier1 reaches the threshold value,
the minimum value of the tier range is set to the boundary
value, and the maximum value of the lower tier range is
set to a value of boundary value x 110% + 5 [IOPH].
Notes:
1.
1. This mode is applied when pages with the
maximum capacity need to be allocated to tier1
(drive type is SSD) with Dynamic Tiering or Dynamic
Tiering for Mainframe.
2.
2. When Tier1 is SSD while SOM901 is set to ON, the
effect of SOM897 and 898 to the gray zone of Tire1
and Tier2 is disabled and the SOM901 setting is
enabled instead. In addition, the settings of SOM897
and 898 are effective for Tire2 and Tier3.
3.
The following is recommended when applying
SOM901.
The actual I/O value (total number of I/Os of all
tiering policies) < the performance potential value of
Tier 1*1 x 0.6
*1: The performance potential value of Tier 1
displayed on Monitor information by using Dx-ray.
Please also see spreadsheet “SOM897_898_901” for more
details about the relations between SOM897, 898 and 901
904
Dynamic Tiering
Dynamic Tiering
for Mainframe
By setting the mode to ON or OFF, the number of pages to
be migrated per unit time at tier relocation is changed.
Mode 904 = ON:
The number of pages to be migrated at tier relocation is
set to up to one page per second. Mode 904 = OFF
(default):
No restriction on the number of pages to be migrated at
tier relocation (existing specification).
Notes:
1.
This mode is applied when:
•
Dynamic Tiering for Mainframe is used (including
multi-platform configurations).
OFF
166
System option modes
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide
Содержание F1500
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Страница 182: ...182 System option modes Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
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