Mode Category Description Default
MCU/R
CU
or Quick Restore operation during LDEV-related
maintenance is suspended.Mode 733 = OFF
(default):Volume Migration or Quick Restore operation
during LDEV-related maintenance is not
suspended.RAID700:Mode 733 = ON:Volume Migration or
Quick Restore operation during LDEV-related maintenance
is not suspendedMode 733 = OFF (default):Volume
Migration or Quick Restore operation during LDEV-related
maintenance is suspendedNote:1. This option should be
applied when Volume Migration or Quick Restore operation
can be suspended during LDEV-related maintenance. 2.
Set mode 733 to ON if you want to perform any LDEV-
related maintenance activities and you do not want these
operations to fail when Volume Migration or Quick Restore
is active.3. This option is recommended as functional
improvement to avoid maintenance failures. In some
cases of a failure in LDEV-related maintenance without
setting the option, Storage Navigator operations may be
unavailable.4. There is the potential for LDEV-related
maintenance activities to fail when Volume Migration and
Quick Restore is active without setting the option.
734 Dynamic
Provisioning
When exceeding the pool threshold, the SIM is reported
as follows:
Mode 734 = ON: The SIM is reported at the time when
exceeding the pool threshold. If the pool usage rate
continues to exceed the pool threshold, the SIM is
repeatedly reported every eight (8) hours. Once the pool
usage rate falls below the pool threshold, and then
exceeds again, the SIM is reported.
Mode 734 = OFF (default): The SIM is reported at the
time when exceeding the pool threshold. The SIM is not
reported while the pool usage rate continues to exceed
the pool threshold. Once the pool usage rate falls below
the pool threshold and then exceeds again, the SIM is
reported.
Notes:
1. This option is turned ON to prevent the write I/O
operation from being unavailable due to pool full.
2. If the exceeding pool threshold SIM occurs frequently,
other SIMs may not be reported.
3. Though turning on this option can increase the
warning effect, if measures such as adding a pool fail
to be done in time so that the pool becomes full,
MODE 729 can be used to prevent file systems from
being destroyed.
4. Turning on MODE 741 can provide the SIM report to
not only the users but also the service personnel.
OFF .
741 Dynamic
Provisioning
The option enables to switch over whether to report the
following SIM for users to the service personnel:
SIM-RC 625000 (DP pool usage rate continues to exceed
the threshold)
Mode 741 = ON: SIM is reported to the service personnel
OFF -
System option modes
B-17
Hitachi Unified Storage VM Block Module Hardware User Guide
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