SWITCHOVER



SWITCHOVER

     Initiates the switchover of volume sets from one
system to another. SPU Switchover/XL is not a part
of the 900 Series HP 3000 Computer System Fundamental
Operating Software and must be purchased separately.

SYNTAX


SWITCHOVER [FROM=]homesystem[[TO=]altsystem]

PARAMETERS


homesystem Indicates the name of the failed system
as specified in the SYSGEN ASYSTEM command.
When the operator enters the command, volume
sets specified in the configuration
that belong to homesystem are switched over
and mounted on altsystem.

altsystem Indicates the name of the alternate system as
specified in the SYSGEN ASYSTEM command. When
the operator enters the command
FROM=altsystem, all volume sets specified in
the configuration as belonging to homesystem
are switched over and mounted to altsystem.

OPERATION

      The operator must enter the command from the alternate
system console. The operator should enter the command
after deciding that switching over is preferable to
rebooting the home system.

The operator can also enter this command when the home
system is operative in order to perform maintenance,
to reconfigure, or to load balance the home system.

NOTE


This command is entered on the system where the volume sets
are going to.

If the home system is inoperative, the system status
message stops between the home system and the
alternate system. If the home system is operative,
the system status message continues during the
switchover.

The operator can enter the command within a session,
job, program, or in break mode.

The following sequence must occur before an operator
can enter the SWITCHOVER command:

1. The SPU Switchover/XL environment must be properly
configured using the SYSGEN utility SPU commands.

2. The configuration must be activated using the
SPUCONTROL SETUP command.

3. The SPU Switchover/XL environment must be
activated using the SPUCONTROL START command.

4. If the home system is operative, the switchable
nonsystem volume sets must be closed.

For this command to function properly, the SPU
configuration file must include a pair with homesystem
as the home system and altsystem as the alternate system.

EXAMPLE(S)

      The following command is entered from the
alternate system's console (Beta) when a system
failure or load balancing occurs:

SWITCHOVER FROM=ALPHA TO=BETA

The alternate system (Beta) responds by displaying
the following message:

/00:00/nn/SPU SWITCHOVER FROM ALPHA TO BETA
STARTING.

You must respond to the following message that is
displayed when switchover has successfully
completed:

/00:00/nn/ACKNOWLEDGE SPU SWITCHOVER FROM BETA
TO ALPHA COMPLETE (Y/N)?

=REPLY nn,Y

This message is displayed every 30 seconds until the
operator acknowledges completion of the switchover.
The reply has no effect except to stop the repeating
message.


Manuals: SPU Switchover/XL User's Guide (36378-90001)