Mode Category Description Default
MCU/R
CU
FCv1 will be performed from 64 processes to 128
processes so that the performance will be improved.Mode
OFF (default): The option (Reserve05) of ShadowImage is
unavailable. The copy of ShadowImage/ ShadowImage
FCv1 is performed with 64 processes.Note:1. Make sure to
apply mode 491 when the performance of ShadowImage /
ShadowImage FCv1 is considered to be important.2. Make
sure not to apply the mode when the host I/O
performance is considered to be important.3. The mode
will be noneffective if 3 or more pairs of BEDs are not
mounted.4. Make sure to set mode 467 to OFF when
using mode 491, since the performance may not improve.
5. The mode is noneffective for the NSC model.
561 ShadowImage,
Universal
Volume
Manager
Allows Quick Restore for external volumes with different
Cache Mode settings.
Mode 561 = ON: Quick Restore for external volumes with
different Cache Mode settings is prevented.
Mode 561 = OFF (default): Quick Restore for external
volumes with different Cache Mode settings is allowed.
OFF MCU/RC
U
589 Universal
Volume
Manager
Turning this option ON changes the frequency of progress
updates when disconnecting an external volume. of
disconnection is changed.
improvement in destaging to the pool by achieving
efficient HDD access.
Mode 589 = ON: For each external volume, progress is
updated only when the progress rate is 100%
Mode 589 = OFF (default): Progress is updated when the
progress rate exceeds the previous level.
Notes:
1. Set this option to ON when disconnecting an external
volume while the specific host IO operation is online
and its performance requirement is severe.
2. Whether the disconnecting status for each external
volume is progressed or not cannot be confirmed on
Storage Navigator (It indicates “-“ until just before
the completion and at the last it changes to 100%).
OFF .
676 Audit Log This option is used to set whether an audit log is to be
stored onto the system disk or not.
Mode 676 = ON: An audit log is stored onto the system
disk.
Mode 676 = OFF (default): An audit log is not stored
onto the system disk.
This mode is also enabled/disabled by enabling/disabling
Audit Log Buffer on the [Audit Log Setting...] window,
which can be opened by selecting [Settings] -> [Security]
-> [Audit Log Setting...] in Storage Navigator
Note:
• This option is applied to the sites where the level of
importance of an audit log is high.
OFF .
B-12
System option modes
Hitachi Unified Storage VM Block Module Hardware User Guide
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