User guide

B–12 System option modes
Hitachi Unified Storage VM Block Module Hardware User Guide
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.
• A system disk with available space of more than 130
MB (185 cylinders when the track format is 3380/
6586/NF80, and 154 cylinders when the track format
is 3390/6588) must exist. (Otherwise, audit log is
not stored even this option is ON).
• Turn this option on after preparing a normal system
disk that meets the condition in (2). If Define
Configuration & Install is performed, turn this option
on after formatting the system disk.
OFF .
690 Universal
Replicator
This option is used to prevent Read JNL or JNL Restore
when the Write Pending rate on RCU exceeds 60% as
follows:
- When CLPR of JNL-Volume exceeds 60%, Read JNL is
prevented.
- When CLPR of Data (secondary)-Volume exceeds 60%,
JNL Restore is prevented.
Mode 690 = ON:
Read JNL or JNL Restore is prevented when the Write
Pending rate on RCU exceeds 60%.
Mode 690 = OFF (default):
Read JNL or JNL Restore is not prevented when the Write
Pending rate on RCU exceeds 60% (the same as before).
Note:
1. This mode can be set online.
2. This mode should be set per customer’s requests.
3. If the Write Pending status long keeps 60% or more
on RCU, it takes extra time for the initial copy to be
completed by making up for the prevented copy
operation.
4. If the Write Pending status long keeps 60% or more
on RCU, the pair status may become Suspend due to the
JNL-Vol being full.
OFF .
Mode Category Description Default
MCU/
RCU