.. if you add new entries, keep the alphabetical sorting!
.. glossary::
+ :sorted:
+
+ ballooning
+ A term describing runtime, dynamic changes to an instance's memory,
+ without having to reboot the instance. Depending on the hypervisor
+ and configuration, the changes need to be initiated manually, or
+ they can be automatically initiated by the hypervisor based on the
+ node and instances memory usage.
+
+ BE parameter
+ BE stands for *backend*. BE parameters are hypervisor-independent
+ instance parameters such as the amount of RAM/virtual CPUs it has
+ been allocated.
+
+ DRBD
+ A block device driver that can be used to build RAID1 across the
+ network or even shared storage, while using only locally-attached
+ storage.
+
+ HV parameter
+ HV stands for *hypervisor*. HV parameters are the ones that describe
+ the virtualization-specific aspects of the instance; for example,
+ what kernel to use to boot the instance (if any), or what emulation
+ model to use for the emulated hard drives.
HVM
- Hardware virtualization mode, where the virtual machine is
- oblivious to the fact that's being virtualized and all the
- hardware is emulated.
+ Hardware virtualization mode, where the virtual machine is oblivious
+ to the fact that's being virtualized and all the hardware is
+ emulated.
LogicalUnit
- The code associated with an OpCode, e.g. the code that implements
- the startup of an instance.
+ The code associated with an :term:`OpCode`, e.g. the code that
+ implements the startup of an instance.
+
+ LUXI
+ Local UniX Interface. The IPC method over :manpage:`unix(7)`
+ sockets used between the CLI tools/RAPI daemon and the master
+ daemon.
+
+ OOB
+ *Out of Band*. This term describes methods of accessing a machine
+ (or parts of a machine) not via the usual network connection. For
+ example, accessing a remote server via a physical serial console or
+ via a virtual one IPMI counts as out of band access.
OpCode
A data structure encapsulating a basic cluster operation; for
example, start instance, add instance, etc.
PVM
- Para-virtualization mode, where the virtual machine knows it's being
- virtualized and as such there is no need for hardware emulation.
+ (Xen) Para-virtualization mode, where the virtual machine knows it's
+ being virtualized and as such there is no need for hardware
+ emulation or virtualization.
+
+ SoR
+ *State of Record*. Refers to values/properties that come from an
+ authoritative configuration source. For example, the maximum VCPU
+ over-subscription ratio is a *SoR* value, but the current
+ over-subscription ration (based on how many instances live on the
+ node) is a :term:`SoW` value.
+
+ SoW
+ *State of the World*. Refers to values that describe directly the
+ world, as opposed to values that come from the
+ configuration. Contrast with :term:`SoR`.
+
+ tmem
+ Xen Transcendent Memory
+ (http://en.wikipedia.org/wiki/Transcendent_memory). It is a
+ mechanism used by Xen to provide memory over-subscription.
watcher
- ``ganeti-watcher`` is a tool that should be run regularly from cron
- and takes care of restarting failed instances, restarting secondary
- DRBD devices, etc. For more details, see the man page
+ :command:`ganeti-watcher` is a tool that should be run regularly
+ from cron and takes care of restarting failed instances, restarting
+ secondary DRBD devices, etc. For more details, see the man page
:manpage:`ganeti-watcher(8)`.
+
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