Generated from C.65.00 /SYSADMIN/PUB/MYCICAT last modified on Sun Aug 29 15:08:37 2004
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.
SWITCHOVER [FROM=]homesystem[[TO=]altsystem]
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.
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.
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.
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) Back to Main Index