Commit 0805519a authored by Iustin Pop's avatar Iustin Pop
Browse files

doc: glossary improvements



These will be used to remove some inline definitions and replace them
with :term:`foo`.
Signed-off-by: default avatarIustin Pop <iustin@google.com>
Reviewed-by: default avatarMichael Hanselmann <hansmi@google.com>
parent b76fd1bc
......@@ -5,37 +5,86 @@ Glossary
.. if you add new entries, keep the alphabetical sorting!
.. glossary::
:sorted:
BE Parameter
BE stands for Backend. BE parameters are hypervisor-independent
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 unix sockets used between
the cli tools and the master daemon.
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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