5 .. if you add new entries, keep the alphabetical sorting!
11 A term describing runtime, dynamic changes to an instance's memory,
12 without having to reboot the instance. Depending on the hypervisor
13 and configuration, the changes need to be initiated manually, or
14 they can be automatically initiated by the hypervisor based on the
15 node and instances memory usage.
18 BE stands for *backend*. BE parameters are hypervisor-independent
19 instance parameters such as the amount of RAM/virtual CPUs it has
23 A block device driver that can be used to build RAID1 across the
24 network or even shared storage, while using only locally-attached
28 HV stands for *hypervisor*. HV parameters are the ones that describe
29 the virtualization-specific aspects of the instance; for example,
30 what kernel to use to boot the instance (if any), or what emulation
31 model to use for the emulated hard drives.
34 Hardware virtualization mode, where the virtual machine is oblivious
35 to the fact that's being virtualized and all the hardware is
39 The code associated with an :term:`OpCode`, e.g. the code that
40 implements the startup of an instance.
43 Local UniX Interface. The IPC method over :manpage:`unix(7)`
44 sockets used between the CLI tools/RAPI daemon and the master
48 *Out of Band*. This term describes methods of accessing a machine
49 (or parts of a machine) not via the usual network connection. For
50 example, accessing a remote server via a physical serial console or
51 via a virtual one IPMI counts as out of band access.
54 A data structure encapsulating a basic cluster operation; for
55 example, start instance, add instance, etc.
58 (Xen) Para-virtualization mode, where the virtual machine knows it's
59 being virtualized and as such there is no need for hardware
60 emulation or virtualization.
63 *State of Record*. Refers to values/properties that come from an
64 authoritative configuration source. For example, the maximum VCPU
65 over-subscription ratio is a *SoR* value, but the current
66 over-subscription ration (based on how many instances live on the
67 node) is a :term:`SoW` value.
70 *State of the World*. Refers to values that describe directly the
71 world, as opposed to values that come from the
72 configuration. Contrast with :term:`SoR`.
75 Xen Transcendent Memory
76 (http://en.wikipedia.org/wiki/Transcendent_memory). It is a
77 mechanism used by Xen to provide memory over-subscription.
80 :command:`ganeti-watcher` is a tool that should be run regularly
81 from cron and takes care of restarting failed instances, restarting
82 secondary DRBD devices, etc. For more details, see the man page
83 :manpage:`ganeti-watcher(8)`.
86 .. vim: set textwidth=72 :