Functional and Operational Characteristics
2–53
Hitachi VSP User and Reference Guide
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.
Mode Category Description Default MCU/RCU
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