User guide

B–20 System option modes
Hitachi Unified Storage VM Block Module Hardware User Guide
749 Dynamic
Provisioning
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.
Notes:
1. This option is applied when no change in
performance characteristic is desired.
2. All Dynamic Provisioning pools are subject to the DP
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.
OFF .
757 Open Enables/disables output of in-band audit logs.
Mode 757 = ON: Output is disabled.
Mode 776 = OFF (default): output is enabled.
Notes:
1. Mode 757 applies to the sites where outputting the
In-band audit logs is not needed.
2. When this option is set to ON
- There is no access to SM for the In-band audit logs,
which can avoid the corresponding performance
degradation.
- SM is not used for the In-band audit logs.
3. If outputting the In-band audit log is desired, set
this mode to OFF.
OFF MCU/
RCU
Mode Category Description Default
MCU/
RCU