User`s manual
DT-6061 User's Manual - Platform (Build 16.0)
11/12/04
Datatek Applications Inc. 40
update the standby with all current application configuration associated with the instances on the
active DT-6061.
10.3 AUTOMATIC STANDBY CONFIGURATION UPDATE
The redundant pair of DT-6061's can be configured to perform a periodic automatic update of
configuration from the active to the standby. This is the most convenient way to propagate
configuration changes from the active system console and from the instances running on the
active into the standby DT-6061.
The update period is configurable by the user at the active system console:
Syntax: stby cfg SCAN=<minutes> AGE=<minutes>
The SCAN period determines how often the standby polls the active, and the AGE value
determines how old files must be before they will be automatically copied to the standby. Thus
when the active fails and switches over, any configuration changes that were made in the last
"AGE" minutes will not be present on the standby.
On the active system console, the vfy stby command displays the current status of the standby
DT-6061 and the configured values for SCAN and AGE.
As part of automatic configuration update, when the standby detects that a new application has
been configured, but the software for that application is not resident on the standby, it copies the
software from the active, provided that application has been properly installed on the active. This
is the only case where software is automatically updated on the standby. Otherwise, the
procedures given in section 11.2.1 above must be performed in order to insure that the version of
the application software used for a particular application is the same on the standby as it is on the
active DT-6061. Either way, registration of the application on the standby still needs to be done
manually.
The SCAN procedure requires quite a bit of overhead on the active DT-6061, so it is
recommended to make the SCAN period as long as the user's requirements will tolerate (e.g. 60
minutes). The AGE delay prevents potentially fault-inducing configuration changes from
propagating to the standby. If the active survives AGE minutes of operations with the new
configuration, that configuration is propagated to the standby.
It is not necessary to maintain the current time and date for automatic update to work properly.
However, if date and timezone [6.4] are used, an improper setting could cause undue delays in
automatic update. In particular, manually setting the date backwards by a large amount while an
update is pending could cause an update delay of the same amount.
10.4 SWITCHOVER
Syntax: switchover
The switchover command, available only at the active console, forces a switchover to the
standby DT-6061. The former active DT-6061 then reboots into standby mode. The reboot
command at the active console simply reboots the active DT-6061 back to active mode, while the
standby DT-6061 allows a little extra time for the active to complete the reboot.
10.5 COMMANDS NOT AVAILABLE IN STANDBY MODE
The following commands are not allowed at the standby console:
• app
• backup
• banner