Only terms specific to VM2000 are included in this glossary. It is assumed that the user is already familiar with terms from other operating systems used, from the hardware-software interface (HSI) and BS2000.
Cross-references to other terms are printed in italics.
ADMIN dialog
Synonym for the administration dialog of the VM administrator for operating his/her VM or of the VM2000 administrator for operating VM2000 via a privileged user task or via $VMCONS.
assignment mode
Type of assignment of a device or a pubset:
explicit (by the VM2000 or VM administrator)
implicit (by the guest system)
assignment set
Assignment sets are groups of devices with the ASSIGN-BY-GUEST attribute which, for organizational reasons, are regarded as a unit for implicit device assignment to VMs. Each device which is envisaged for implicit assignment to a VM must have the ASSIGN-BY-GUEST attribute and should be assigned to precisely one assignment set.
BS2000 VM
Virtual machine with a BS2000 guest system.
Configuration Raw Device (CRD)
Special system disks for storing configuration data.
CPU pool
Combination of real normal or extra CPUs to form an organizational unit.
CPU share
The CPU share of a VM is the share of the CPU capacity of the CPU pool which the VM may use or is using in a time period.
CPU share, current
Planned value for the CPU share of the CPU pool’s CPU capacity which a VM has, using the current values of the active objects for VM2000 operation. Comparison value for measurements under VM2000.
CPU share, effective
Planned value for the CPU share of the CPU pool’s CPU capacity which a VM has under idealized conditions.
guest system
Operating system which runs on a virtual machine.
HSI
Hardware-software interface. Depending on the application, the term is defined in detail as: real HSI, virtual HSI, VM2000 HSI.
hypervisor (VM2000 hypervisor)
Part of VM2000 on SU /390 which controls the execution of the guest systems on the virtual machines. On SU x86, this function is executed by the Xen hypervisor.
hypervisor mode (VM2000 hypervisor mode)
Processor mode in VM2000-HSI on SU /390 with new registers and commands in which the VM2000 hypervisor runs.
monitor (VM2000 monitor)
Part of VM2000 via which virtual machines are operated by means of VM2000 commands.
monitor system
Preferred guest system on which the monitor is located. It is the guest system on the monitor VM.
Monitor VM
Virtual machine on which the monitor system runs.
MTC
Magnetic tape cartridge
multiprocessor level
Mnemonic expression for the number of virtual CPUs of a VM.
persistent VM
VM with the PERSISTENT or “High-Availability VM” attribute. The VM definition of a persistent VM is still available after a reboot of the Server Unit or after /DELETE-VM.
real HSI
Hardware-software interface of a Server Unit which has not been supplemented by firmware components.
scheduling
When a VM is scheduled on SU /390, the VM2000 hypervisor starts an operable virtual CPU of a VM on a free real CPU. On SU x86, this function is executed by the Xen hypervisor.
usage mode
Type of usage of a device or a pubset:
usable by only one VM (
EXCLUSIVE)usable by multiple VMs (
SHARED) with direct (SH(D)) or indirect (SH(I)) I/O processing
VC dialog
Synonym for the dialog of the guest system operator via $VMCONS for operating his/her guest system. On SU /390, the virtual console is required for this dialog.
virtual console
A virtual device which is generated as a physical console at hardware generation of the SU /390 but does not actually exist. If the virtual console is used as a console of the guest system, the message traffic is executed as a VC dialog via $VMCONS. The virtual console is not used on SU x86.
virtual CPU (virtual processor)
CPU of a virtual machine.
virtual HSI
Hardware-software interface of a virtual machine.
virtual machine, VM
A virtual Server Unit for the user on which a guest system runs.
virtual machine system
Program system which offers several identical or different virtual machines on a real Server Unit.
VM
Abbreviation for virtual machine.
$VMCONS
BCAM application in the monitor system; it controls and monitors the exchange of messages for operating the VMs (ADMIN dialog) and for operating the guest systems (VC dialog).
VM administrator
Administrator of a VM. He/she may issue only VM administrator commands (ADMIN dialog).
VM administrator command
This is a command for use by the VM administrator and controls operation of a VM.
VM definition
Configuration definition of a VM.
VM group
On SU /390, combination of VMs to form an organizational unit with its own attributes.
VM identification, VM-ID
Identification of a VM. It can be the VM index or the VM name.
VM index
Whole number n>=1. Identifies the VM as VM1 to VMn.
VM Migration
Migration of a (running) VM from the current Server Unit (source SU) to another Server Unit (target SU), while retaining its resources and without tangible interruption of the guest system operation. Synonym: Live Migration.
VM mode
Processor mode in VM2000-HSI on SU /390 in which the virtual machines run.
VM name
Name of a VM or VM definition. This identifies the VM in addition to the VM index.
VMn
Synonym for the VM with the VM index n.
VM2000
Name of the virtual machine system described here.
VM2000 administrator
Administrator of the Monitor-VM. Only he/she may input VM2000 administrator commands (ADMIN dialog).
VM2000 administrator command
Command for use by the VM2000 administrator for controlling the overall VM2000 system.
VM2000 command
Generic term for VM2000 administrator command and VM administrator command.
VM2000 HSI
HSI which is offered by the Server Unit for an operating system (real HSI), on SU /390 with VM2000 extensions in the form of firmware components. The VM2000 HSI on SU /390 offers two processor modes, (VM2000) hypervisor mode and VM mode.