Mode
Category
Description
Default
MCU/RCU
•
SOM 899 is ON: I/O synchronous copy starts without
retrying Volume Migration.
•
SOM 899 is OFF: I/O synchronous copy starts when the
number of retries reaches half of the threshold of Volume
Migration retry.
Mode 900 = OFF (default):
•
SOM 899 is ON: I/O synchronous copy starts when the
threshold of Volume Migration retry is exceeded.
(Recommended)
•
SOM 899 is OFF: Volume Migration is retired and I/O
synchronous copy is not executed.
Notes:
1.
This SOM is applied when improvement of Volume
Migration success rate is desired under the condition
that there are many updates to a migration source
volume of Volume Migration.
2.
During I/O synchronous copy, host I/O performance
degrades.
901
Dynamic Tiering
By setting this SOM to ON or OFF, the page allocation method
of Tier Level ALL when the drive type of tier1 is SSD changes
as follows.
Mode 901 = ON:
For tier1 (drive type is SSD), pages are
allocated until the capacity reaches the limit. Without
consideration of exceeding performance limitation, allocation
is done from highly loaded pages until reaching the capacity
limit
When the capacity of 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 exceeding performance
limitation, 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 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
× 110% + 5 [IOPH].
Notes:
1.
This SOM is applied when pages with the maximum
capacity need to be allocated to tier1 (drive type is
SSD) with Dynamic Tiering.
2.
When Tier1 is SSD while SOM 901 is set to ON, the
effect of SOM 897 and 898 to the gray zone of Tier1
and Tier2 is disabled and the SOM 901 setting is
enabled instead. In addition, the settings of SOM 897
and 898 are effective for Tier2 and Tier3.
3.
The following is recommended when applying SOM 901.
OFF
-
System option modes
373
System Administrator Guide for VSP Gx00 models and VSP Fx00 models
Summary of Contents for VSP F400
Page 10: ...10 System Administrator Guide for VSP Gx00 models and VSP Fx00 models ...
Page 16: ...16 Preface System Administrator Guide for VSP Gx00 models and VSP Fx00 models ...
Page 210: ...210 User administration System Administrator Guide for VSP Gx00 models and VSP Fx00 models ...
Page 244: ...244 Setting up security System Administrator Guide for VSP Gx00 models and VSP Fx00 models ...
Page 256: ...256 Alert notifications System Administrator Guide for VSP Gx00 models and VSP Fx00 models ...
Page 270: ...270 Managing license keys System Administrator Guide for VSP Gx00 models and VSP Fx00 models ...
Page 386: ...386 System option modes System Administrator Guide for VSP Gx00 models and VSP Fx00 models ...
Page 406: ...406 Glossary System Administrator Guide for VSP Gx00 models and VSP Fx00 models ...
Page 412: ...412 Index System Administrator Guide for VSP Gx00 models and VSP Fx00 models ...
Page 413: ...System Administrator Guide for VSP Gx00 models and VSP Fx00 models ...
