Hitachi Virtual Storage Platform, Руководство пользователя и справочник

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Hitachi VSP User and Reference Guide
2–44
Functional and Operational Characteristics
867 Dynamic
Provisioning All-page reclamation (discarding all mapping
information between HDP pool and HDP volumes) is
executed in DP-VOL LDEV format. This new method
is enabled or disabled by setting the mode to ON or
OFF.
Mode 867 = ON :
LDEV format of the DP-VOL is performed with page
reclamation.
Mode 867 = OFF (default):
LDEV format of the HDP-VOL is performed with 0
data writing.
Notes:
1. 1. This mode is applied at recovery after a pool
failure.
2. 2. Do not change the setting of the mode during
DP-VOL format.
3. 3. If the setting of the mode is changed during
DP-VOL format, the change is not reflected to
the format of the DP-VOL being executed but
the format continues in the same method.
OFF ..
872 Universal
Volume
Manager When the mode is applied, the order of data
transfer slots is guaranteed at the destaging from
P9500 to an external storage.
Mode 872 = ON:
The order of data transfer slots from VSP to an
external storage is guaranteed.
Mode 872 = OFF (default):
The order of data transfer slots from VSP to an
external storage is not guaranteed.
In V03 and later versions, the mode is set to ON
before shipment.
If the micro-program is exchanged to a supported
version (V03 or later), the setting is OFF as default
and needs to be set to ON manually.
Note:
1. This mode is applied when performance
improvement at sequential write in UVM
configuration is required.
OFF ..
Mode Category Description Default MCU/RCU