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1 | e2078d28 | Iustin Pop | ======== |
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2 | e2078d28 | Iustin Pop | Glossary |
3 | e2078d28 | Iustin Pop | ======== |
4 | e2078d28 | Iustin Pop | |
5 | e2078d28 | Iustin Pop | .. if you add new entries, keep the alphabetical sorting! |
6 | e2078d28 | Iustin Pop | |
7 | e2078d28 | Iustin Pop | .. glossary:: |
8 | 0805519a | Iustin Pop | :sorted: |
9 | e2078d28 | Iustin Pop | |
10 | 0805519a | Iustin Pop | ballooning |
11 | 0805519a | Iustin Pop | A term describing runtime, dynamic changes to an instance's memory, |
12 | 0805519a | Iustin Pop | without having to reboot the instance. Depending on the hypervisor |
13 | 0805519a | Iustin Pop | and configuration, the changes need to be initiated manually, or |
14 | 0805519a | Iustin Pop | they can be automatically initiated by the hypervisor based on the |
15 | 0805519a | Iustin Pop | node and instances memory usage. |
16 | 0805519a | Iustin Pop | |
17 | 0805519a | Iustin Pop | BE parameter |
18 | 0805519a | Iustin Pop | BE stands for *backend*. BE parameters are hypervisor-independent |
19 | 3d5ebbf0 | Stephen Shirley | instance parameters such as the amount of RAM/virtual CPUs it has |
20 | 3d5ebbf0 | Stephen Shirley | been allocated. |
21 | 3d5ebbf0 | Stephen Shirley | |
22 | 0805519a | Iustin Pop | DRBD |
23 | 0805519a | Iustin Pop | A block device driver that can be used to build RAID1 across the |
24 | 0805519a | Iustin Pop | network or even shared storage, while using only locally-attached |
25 | 0805519a | Iustin Pop | storage. |
26 | 0805519a | Iustin Pop | |
27 | 0805519a | Iustin Pop | HV parameter |
28 | 0805519a | Iustin Pop | HV stands for *hypervisor*. HV parameters are the ones that describe |
29 | 0805519a | Iustin Pop | the virtualization-specific aspects of the instance; for example, |
30 | 0805519a | Iustin Pop | what kernel to use to boot the instance (if any), or what emulation |
31 | 0805519a | Iustin Pop | model to use for the emulated hard drives. |
32 | 0805519a | Iustin Pop | |
33 | e2078d28 | Iustin Pop | HVM |
34 | 0805519a | Iustin Pop | Hardware virtualization mode, where the virtual machine is oblivious |
35 | 0805519a | Iustin Pop | to the fact that's being virtualized and all the hardware is |
36 | 0805519a | Iustin Pop | emulated. |
37 | e2078d28 | Iustin Pop | |
38 | e2078d28 | Iustin Pop | LogicalUnit |
39 | 0805519a | Iustin Pop | The code associated with an :term:`OpCode`, e.g. the code that |
40 | 0805519a | Iustin Pop | implements the startup of an instance. |
41 | e2078d28 | Iustin Pop | |
42 | 3d5ebbf0 | Stephen Shirley | LUXI |
43 | 0805519a | Iustin Pop | Local UniX Interface. The IPC method over :manpage:`unix(7)` |
44 | 0805519a | Iustin Pop | sockets used between the CLI tools/RAPI daemon and the master |
45 | 0805519a | Iustin Pop | daemon. |
46 | 0805519a | Iustin Pop | |
47 | 0805519a | Iustin Pop | OOB |
48 | 0805519a | Iustin Pop | *Out of Band*. This term describes methods of accessing a machine |
49 | 0805519a | Iustin Pop | (or parts of a machine) not via the usual network connection. For |
50 | 0805519a | Iustin Pop | example, accessing a remote server via a physical serial console or |
51 | 0805519a | Iustin Pop | via a virtual one IPMI counts as out of band access. |
52 | 3d5ebbf0 | Stephen Shirley | |
53 | e2078d28 | Iustin Pop | OpCode |
54 | 7faf5110 | Michael Hanselmann | A data structure encapsulating a basic cluster operation; for |
55 | 7faf5110 | Michael Hanselmann | example, start instance, add instance, etc. |
56 | e2078d28 | Iustin Pop | |
57 | e2078d28 | Iustin Pop | PVM |
58 | 0805519a | Iustin Pop | (Xen) Para-virtualization mode, where the virtual machine knows it's |
59 | 0805519a | Iustin Pop | being virtualized and as such there is no need for hardware |
60 | 0805519a | Iustin Pop | emulation or virtualization. |
61 | 0805519a | Iustin Pop | |
62 | 0805519a | Iustin Pop | SoR |
63 | 0805519a | Iustin Pop | *State of Record*. Refers to values/properties that come from an |
64 | 0805519a | Iustin Pop | authoritative configuration source. For example, the maximum VCPU |
65 | 0805519a | Iustin Pop | over-subscription ratio is a *SoR* value, but the current |
66 | 0805519a | Iustin Pop | over-subscription ration (based on how many instances live on the |
67 | 0805519a | Iustin Pop | node) is a :term:`SoW` value. |
68 | 0805519a | Iustin Pop | |
69 | 0805519a | Iustin Pop | SoW |
70 | 0805519a | Iustin Pop | *State of the World*. Refers to values that describe directly the |
71 | 0805519a | Iustin Pop | world, as opposed to values that come from the |
72 | 0805519a | Iustin Pop | configuration. Contrast with :term:`SoR`. |
73 | 0805519a | Iustin Pop | |
74 | 0805519a | Iustin Pop | tmem |
75 | 0805519a | Iustin Pop | Xen Transcendent Memory |
76 | 0805519a | Iustin Pop | (http://en.wikipedia.org/wiki/Transcendent_memory). It is a |
77 | 0805519a | Iustin Pop | mechanism used by Xen to provide memory over-subscription. |
78 | e2078d28 | Iustin Pop | |
79 | e2078d28 | Iustin Pop | watcher |
80 | 0805519a | Iustin Pop | :command:`ganeti-watcher` is a tool that should be run regularly |
81 | 0805519a | Iustin Pop | from cron and takes care of restarting failed instances, restarting |
82 | 0805519a | Iustin Pop | secondary DRBD devices, etc. For more details, see the man page |
83 | e2078d28 | Iustin Pop | :manpage:`ganeti-watcher(8)`. |
84 | 558fd122 | Michael Hanselmann | |
85 | 0805519a | Iustin Pop | |
86 | 558fd122 | Michael Hanselmann | .. vim: set textwidth=72 : |
87 | 0805519a | Iustin Pop | .. Local Variables: |
88 | 0805519a | Iustin Pop | .. mode: rst |
89 | 0805519a | Iustin Pop | .. fill-column: 72 |
90 | 0805519a | Iustin Pop | .. End: |