Technical information

Technician’s Handbook
158
Checking a Redundant System
1. Log on to the maintenance terminal and select
maintenance mode.
2. Enter the following commands (first from the active
plane, then from the inactive plane):
FIL STAT RED Indicates whether the database on
both drives are IN SYNCH, OUT OF
SYNCH, or ISOLATED. The
databases should be IN SYNCH. If
both planes are not IN SYNCH, see
Table 25: Status of Redundant File
System on page 125.
Note: It takes approximately 15
minutes for both planes to become
synchronized.
DBMS STAT Checks the status of the initialized
flag. The flag should be on. If the flag
is off, enter DBMS SAVE (first from
the active plane and then from the
inactive plane).
DBMS CH F Checks the sanity and current status
of the system. The number of
detected errors should be zero.
Otherwise, there is a problem with
the database and immediate steps
should be taken to begin recovery.
Note: Check the active and inactive
planes. This step takes 60 seconds
to complete.
3. Enter the following commands from the active plane:
SH ST AL Checks for system alarms. There
should be no alarms. If alarms are
present, see Flowchart 3: An Alarm is
Present on page 120.