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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 | 11a0e343 | Jose A. Lopes | A term describing dynamic changes to an instance's memory while the instance |
12 | 11a0e343 | Jose A. Lopes | is running that don't require an instance reboot. Depending on the |
13 | 11a0e343 | Jose A. Lopes | hypervisor and configuration, changes may be automatically initiated by the |
14 | 11a0e343 | Jose A. Lopes | hypervisor (based on the memory usage of the node and instance), or may need |
15 | 11a0e343 | Jose A. Lopes | to be initiated manually. |
16 | 0805519a | Iustin Pop | |
17 | 0805519a | Iustin Pop | BE parameter |
18 | 11a0e343 | Jose A. Lopes | BE stands for *backend*. BE parameters are hypervisor-independent instance |
19 | 11a0e343 | Jose A. Lopes | parameters, such as the amount of RAM/virtual CPUs allocated to an instance. |
20 | 3d5ebbf0 | Stephen Shirley | |
21 | 0805519a | Iustin Pop | DRBD |
22 | 11a0e343 | Jose A. Lopes | A block device driver that can be used to build RAID1 across the network or |
23 | 11a0e343 | Jose A. Lopes | across shared storage, while using only locally-attached storage. |
24 | 0805519a | Iustin Pop | |
25 | 0805519a | Iustin Pop | HV parameter |
26 | 11a0e343 | Jose A. Lopes | HV stands for *hypervisor*. HV parameters describe the virtualization- |
27 | 11a0e343 | Jose A. Lopes | specific aspects of the instance. For example, a HV parameter might describe |
28 | 11a0e343 | Jose A. Lopes | what kernel (if any) to use to boot the instance or what emulation model to |
29 | 11a0e343 | Jose A. Lopes | use for the emulated hard drives. |
30 | 0805519a | Iustin Pop | |
31 | e2078d28 | Iustin Pop | HVM |
32 | 11a0e343 | Jose A. Lopes | *Hardware Virtualization Mode*. In this mode, the virtual machine is |
33 | 11a0e343 | Jose A. Lopes | oblivious to the fact that it is virtualized and all its hardware is |
34 | 0805519a | Iustin Pop | emulated. |
35 | e2078d28 | Iustin Pop | |
36 | e2078d28 | Iustin Pop | LogicalUnit |
37 | 11a0e343 | Jose A. Lopes | The code associated with an :term:`OpCode`; for example, the code that |
38 | 0805519a | Iustin Pop | implements the startup of an instance. |
39 | e2078d28 | Iustin Pop | |
40 | 3d5ebbf0 | Stephen Shirley | LUXI |
41 | 11a0e343 | Jose A. Lopes | Local UniX Interface. The IPC method over :manpage:`unix(7)` sockets used |
42 | 11a0e343 | Jose A. Lopes | between the CLI tools/RAPI daemon and the master daemon. |
43 | 0805519a | Iustin Pop | |
44 | 0805519a | Iustin Pop | OOB |
45 | 11a0e343 | Jose A. Lopes | *Out of Band*. This term describes methods of accessing a machine (or parts |
46 | 11a0e343 | Jose A. Lopes | of a machine) by means other than the usual network connection. Examples |
47 | 11a0e343 | Jose A. Lopes | include accessing a remote server via a physical serial console or via a |
48 | 11a0e343 | Jose A. Lopes | virtual console. IPMI is also considered OOB access. |
49 | 3d5ebbf0 | Stephen Shirley | |
50 | e2078d28 | Iustin Pop | OpCode |
51 | 11a0e343 | Jose A. Lopes | A data structure encapsulating a basic cluster operation; for example: start |
52 | 11a0e343 | Jose A. Lopes | instance, add instance, etc. |
53 | e2078d28 | Iustin Pop | |
54 | e2078d28 | Iustin Pop | PVM |
55 | 11a0e343 | Jose A. Lopes | (Xen) *Para-virtualization mode*. In this mode, the virtual machine is aware |
56 | 11a0e343 | Jose A. Lopes | that it is virtualized; therefore, there is no need for hardware emulation |
57 | 11a0e343 | Jose A. Lopes | or virtualization. |
58 | 0805519a | Iustin Pop | |
59 | 0805519a | Iustin Pop | SoR |
60 | 0805519a | Iustin Pop | *State of Record*. Refers to values/properties that come from an |
61 | 11a0e343 | Jose A. Lopes | authoritative configuration source. For example, the maximum VCPU over- |
62 | 11a0e343 | Jose A. Lopes | subscription ratio is a SoR value, but the current over-subscription ratio |
63 | 11a0e343 | Jose A. Lopes | (based upon how many instances live on the node) is a :term:`SoW` value. |
64 | 0805519a | Iustin Pop | |
65 | 0805519a | Iustin Pop | SoW |
66 | 11a0e343 | Jose A. Lopes | *State of the World*. Refers to values that directly describe the world, as |
67 | 11a0e343 | Jose A. Lopes | opposed to values that come from the configuration (which are considered |
68 | 11a0e343 | Jose A. Lopes | :term:`SoR`). |
69 | 0805519a | Iustin Pop | |
70 | 0805519a | Iustin Pop | tmem |
71 | 11a0e343 | Jose A. Lopes | Xen Transcendent Memory (http://en.wikipedia.org/wiki/Transcendent_memory). |
72 | 11a0e343 | Jose A. Lopes | tmem is a mechanism used by Xen to provide memory over-subscription. |
73 | e2078d28 | Iustin Pop | |
74 | e2078d28 | Iustin Pop | watcher |
75 | 11a0e343 | Jose A. Lopes | :command:`ganeti-watcher` is a tool that should be run regularly from |
76 | 11a0e343 | Jose A. Lopes | cron. The tool executes tasks such as restarting failed instances and |
77 | 11a0e343 | Jose A. Lopes | restarting secondary DRBD devices. For more details, see the man page |
78 | e2078d28 | Iustin Pop | :manpage:`ganeti-watcher(8)`. |
79 | 558fd122 | Michael Hanselmann | |
80 | 0805519a | Iustin Pop | |
81 | 558fd122 | Michael Hanselmann | .. vim: set textwidth=72 : |
82 | 0805519a | Iustin Pop | .. Local Variables: |
83 | 0805519a | Iustin Pop | .. mode: rst |
84 | 0805519a | Iustin Pop | .. fill-column: 72 |
85 | 0805519a | Iustin Pop | .. End: |