Restoring a VM2000 configuration

The VM2000 administrator can restore a VM2000 configuration using the /RESTORE-VM-CONFIGURATION command.

In this case the components of the VM2000 configuration are restored from a backup file which was created beforehand on the monitor system's home pubset with /SAVE-VM-CONFIGURATION.

Components of the VM2000 configuration which were not backed up (see section "VM2000 components not backed up") must, if necessary, be restored manually.

A VM2000 configuration can only be restored successfully if the requirements described below are fulfilled at command entry time.

If one of the requirements is not fulfilled, the command is rejected or continued. The consequences of continuing the command are described for the respective requirements below.

Requirements:

• The current VM2000 version must be greater (younger) than or equal to the backed-up VM2000 version

  If the current VM2000 version is less (older) than the backed-up VM2000 version, the backed-up VM2000 configuration could contain components which are not known in the current (older) VM2000 version.

• The current real main memory must be at least as large as at the time of the backup

  Otherwise, the warning message VMS4811 is output and processing is continued. If during further processing a VM cannot be configured because of a lack of main memory, the message VMS4803 is output for this VM.

• Requirements for the real CPUs:

  • The number of operable normal CPUs (states ATT or DET) must be at least as high as at the time of the backup

    Otherwise, two cases are distinguished:

    1. If the backup contains not only the CPU pool *STDPOOL but also another VM2000 CPU pool, the command is rejected with the message VMS4812.

    2. If in addition to the CPU pool *STDPOOL the backup contains no other VM2000 CPU pool, the warning message VMS4813 is output and processing is continued. If during further processing a VM cannot be configured again because the multiprocessor level is too high, the message VMS4803 is output for this VM.

  • The number of operable extra CPUs must be at least as high as at the time of the backup.

    Otherwise, two cases are distinguished:

    1. If the backup contains not only the CPU pool *STDPOOL but also another VM2000 CPU pool, the command is rejected with the message VMS4812.

    2. If in addition to the CPU pool *STDPOOL the backup contains no other VM2000 CPU pool, the warning message VMS4813 is output and processing is continued.

• Only the static CPU pools may exist

• No VM groups may exist

• Only the standard assignment set may exist

• No BS2000 VMs except the monitor VM may be configured on the system

• The VM name of a VM from the backup may not be the same as the VM name of an existing persistent VM definition

• Requirements for the current monitor VM:

  • Memory reconfiguration may not be in progress

  • The VM name of the current monitor VM is not assigned to any other VM than the monitor VM in the backed-up configuration

    Otherwise, the warning message VMS4816 is output and processing is continued. If in the further processing a VM cannot be configured because of the VM name, message VMS4803 is output for this VM.

  • On SU /390, the location of the current monitor VM may not hinder the configuration of a backed-up VM (the location of the current monitor VM can change as a result of the changed size of the hypervisor)

    Otherwise, the warning message VMS4816 is output and processing is continued. If in the further processing a VM cannot be configured because of the location of the monitor VM, the message VMS4803 is output for this VM.

  • The main memory size of the current monitor VM may not be greater than the backed-up main memory size

    On SU x86, the maximum main memory size of the current monitor VM may also not be greater than the backed-up maximum main memory size.

    Otherwise, the warning message VMS4816 is output and processing is continued. If in the further processing a VM cannot be configured because of the main memory size or the maximum main memory size of the monitor VM, the message VMS4803 is output for this VM.

  • The current explicit device assignments of the monitor VM must be a subset of the backed-up explicit device assignments

    This requirement is not checked. If in the further processing the assignment of a device to a VM cannot be set up because of the assignment of this device to the current monitor VM, the message VMS4803 is output for this device.

• All devices which are assigned to a VM or to an assignment set in the backed-up VM2000 configuration must be available to VM2000 again in the current system

  This requirement is not checked. If in the further processing an assignment cannot be set up because a device is missing, the message VMS4803 is output for this device.