Phases of a VM Migration

Execution of a VM Migration requires several individual steps on both the source and target SU. Depending on the size and load profile of the VM to be migrated, the necessary time can vary and can therefore not be calculated in advance. Because of this, the VM Migration with the /MIGRATE-VM command is split into two phases:

• Synchronous checking of the aforementioned prerequisites on both the source and target SU. If the prerequisites are not met, the caller is informed.

  During the synchronous checking, the system identifies which devices of the VM have to be implicitly detached during the asynchronous execution of the VM Migration, see "Device management during a VM Migration". For every device identified device, the warning VMS2471 is issued.

  The prerequisites on the source and target SU can also be checked in advance, using the /CHECK-VM-MIGRATION command.

• If all prerequisites for the VM Migration are met or if only warnings have been issued, the asynchronous execution of the VM Migration is initiated. Control is given back to the caller.

VM status during the migration

On the source SU, the current status of the VM is displayed in the VM2000 information commands, followed by the (MIGR) display, e.g. RUNNING(MIGR). On the target SU, the VM is displayed with the SETUP(MIGR) state. See "SHOW-VM-ATTRIBUTES (Output attributes of a VM)".

VM Migration on SU /390

On SU /390, VM2000 executes the VM Migration on the source and target SU. Messages regarding the VM Migration are output to the console of the monitor system and to the VM2000 administrators of the source and target SU.

On the source SU, the VMS2450 message indicates the start of the VM Migration.
The VMS2452 message indicates that the VM has been stopped.
The VMS4024 message indicates that the VM has been deleted.
The VMS2451 message indicates that the VM Migration has been completed successfully.

On the target SU, the VMS2430 message indicates the start of the VM Migration.
The VMS3050 message indicates that the VM has been created.
The VMS2432 message indicates that the VM has been continued.
The VMS2431 message indicates that the VM Migration has been completed successfully.

In case of warnings or errors, informative messages are output on the source and target SU.

VM Migration on SU x86

On SU x86, the VM Migration is executed by Xen/X2000. Messages regarding the VM Migration are output to the console of the monitor system and to the VM2000 administrators of the source and target SU.

On the source SU, the VMS2450 message indicates the start of the VM Migration.
The HAL0331 message (only on the guest system console) indicates that the VM has been stopped.
The VMS6021 message indicates that the VM has been deleted.
The VMS2451 message indicates that the VM Migration has been completed successfully.

On the target SU, the VMS6020 message indicates the creation of the VM.
The HAL0332 message (only on the guest system console) indicates that the VM has been continued.

In case of a VM Migration with warnings or errors, informative messages are output on the source and target SU.