Mode Category Description Default
MCU/R
CU
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/RC
U
803 Dynamic
Provisioning,
Data Retention
Utility
While a DP pool VOL is blocked, if a read or write I/O is
issued to the blocked pool VOL, this mode can enable the
Protect attribute of DRU for the target DP-VOL. Mode 803
= ON:While a DP pool VOL is blocked, if a read or write
I/O is issued to the blocked pool VOL, the DRU attribute is
set to Protect. Mode 803 = OFF (default):While a DP pool
VOL is blocked, if a read or write I/O is issued to the
blocked pool VOL, the DRU attribute is not set to Protect.
Note:1. This mode is applied when - a file system using
DP pool VOLs is used.- Data Retention Utility is installed.
2. Because the DRU attribute is set to Protect for the V-
VOL, a read I/O is also disabled. 3. If Data Retention
Utility is not installed, the expected effect cannot be
achieved. 4. The Protect attribute of DRU for the HDP V-
VOL can be released on the Data Retention window of
Storage Navigator after recovering the blocked pool VOL.
OFF .
855 ShadowImage,
Volume
Migration
By switching the mode to ON/OFF when ShadowImage is
used with SOM 467 set to ON, copy processing is
continued or stopped as follows.
System option modes
B-19
Hitachi Unified Storage VM Block Module Hardware User Guide
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