Hitachi Universal Storage Platform VM - Manual (Page 77)

Functional and Operational Characteristics 3-33
Hitachi Universal Storage Platform V/VM User and Reference Guide
Mode Category Function Default MCU/RCU
749 Dynamic
Provisioning This option disables the Dynamic Provisioning Rebalance
function that allows the HDDs of all ECC Groups in the pool to
share the load.
Mode 749 = ON: The Dynamic Provisioning Rebalance
function is disabled.
Mode 749 = OFF (default): The Dynamic Provisioning
Rebalance function is activated.
Note:
1. This option is applied when no change in performance
characteristic is desired.
2. This option is based on MODE 748. A pool created when
the MODE 748 is OFF can be subject to the Dynamic
Provisioning Rebalance function.
3. When a pool is newly installed, the load may be
concentrated on the installed pool volumes.
4. When 0 data discarding is executed, load may be
unbalanced among pool volumes.
5. This option does not work for the pool installed while MODE
748 is ON. Only pools installed when MODE 748 is OFF can
be subject to the Dynamic Provisioning Rebalance function.
OFF –
Table 3-2 Modes 503 and 269: Storage Navigator Operations
Mode 269
Mode 503 Operation Target of Operation ON OFF
ON Virtual LVI/LUN (CVS) All LDEVs in a PG No format No format
Virtual LVI/LUN (CVS) Some LDEVs in a PG No format No format
Format PG is specified No operation No operation
Format All LDEVs in a PG Low speed Low speed
Format Some LDEVs in a PG Low speed Low speed
OFF Virtual LVI/LUN (CVS) All LDEVs in a PG High speed Low speed
Virtual LVI/LUN (CVS) Some LDEVs in a PG Low speed Low speed
Format PG is specified No operation No operation
Format All LDEVs in a PG Low speed Low speed
Format Some LDEVs in a PG Low speed Low speed