Generated from C.60.01 /SYS/PUB/CICAT last modified on Thu Jan 11 09:18:52 2001
Initiates the switchback of volume sets from the alternate system to the home system. SPU Switchover/XL is not a part of the 900 Series HP 3000 Computer System Fundamental Operating System and must be purchased separately.
SWITCHBACK [FROM=]altsystem[[TO=]homesystem]
altsystem Indicates the name of the alternate system as specified in the SYSGEN APAIR command. When the operator enters the command FROM=altsystem, all volume sets specified in the configuration as belonging to homesystem are switched back from altsystem and mounted to homesystem. Altsystem can be operative or inoperative when command is entered. homesystem Indicates the name of the system whose home volume sets were switched over to the alternate system. When the operator enters the command TO=homesystem, the switchable volume sets specified in the configuration that belong to homesystem are switched back from altsystem and mounted on homesystem.
Before an operator can execute the command, you must assign homesystem as the home system and altsystem as the alternate system in the SPU configuration file. If a hardware failure occurred, the operator must enter the command from the home system console after a successful reboot; the system is then ready to receive the volume sets defined using the SYSGEN utility AVOLSET command. If a load balance was performed, no system reboot is required. The operator can enter the command within a session, job, program, or in break mode. The following requirement apply before an operator can enter the SWITCHBACK command: o The SPU Switchover/XL environment must be properly configured using the SYSGEN utility SPU commands. o The switchable nonsystem volume set must be closed on the alternate system. o The SWITCHOVER command must have been previously entered from the alternate system. o The operator must have OP or SM capability.
The following command is issued from the home system (Alpha) console as shown: SWITCHBACK FROM=BETA TO=ALPHA The home system (Alpha) responds by displaying the following message once on the home system (Alpha) and alternate system (Beta) consoles: /00:00/nn/SPU SWITCHBACK FROM BETA TO ALPHA STARTING. You must respond to the following message that is displayed on the home system (Alpha) when switchback has successfully completed: /00:00/nn/ACKNOWLEDGE SPU SWITCHBACK FROM BETA TO ALPHA COMPLETE (Y/N)? =REPLY nn,Y This message is displayed every 30 seconds until the operator acknowledges completion of the switchback. The operator must respond to this message on the home system (Alpha). The reply has no effect except to stop the repeating message. The following message appears once on the alternate system (Beta) console: /00:00/nn/SWITCHBACK FROM BETA TO ALPHA COMPLETE. Commands: SPUCONTROL, SWITCHOVER Manuals : SPU Switchover/XL User's Guide (36378-90001) Back to Main Index