73 lines
1.9 KiB
ReStructuredText
73 lines
1.9 KiB
ReStructuredText
..
|
||
|
||
This work is licensed under a Creative Commons Attribution 3.0 Unported License.
|
||
http://creativecommons.org/licenses/by/3.0/legalcode
|
||
|
||
|
||
========================================
|
||
Size unit conversion and relative sizing
|
||
========================================
|
||
|
||
https://blueprints.launchpad.net/bareon/+spec/size-unit-conversion-and-relative-sizing
|
||
|
||
Problem description
|
||
===================
|
||
|
||
The only size unit Bareon currently supports is MiB. Users often want to use
|
||
both GiB and MiB, as well as relative sizes like 50%, which is impossible.
|
||
|
||
Proposed change
|
||
===============
|
||
|
||
NOTE: This is a contribution of the feature developed within Cray OpenStack project.
|
||
We will try to make a minimum changes to existing code.
|
||
|
||
All “size” values are strings containing either an integer number and size
|
||
unit (e.g., “100 MiB” or 100MiB”).
|
||
|
||
Available measurement units are:
|
||
|
||
- ‘MB’, ‘GB’, ‘TB’, ‘PB’, ‘EB’, ‘ZB’, ‘YB’,
|
||
- ‘MiB’, ‘GiB’, ‘TiB’, ‘PiB’, ‘EiB’, ‘ZiB’, ‘YiB’
|
||
|
||
Also relative values are supported for partition, pv and lv.
|
||
Relative values use the size of the containing device or volume group as a
|
||
base. For example, specifying “40%” for a 100MiB disk would result in a
|
||
40MiB partition. Obviously, relative sizes cannot be used for disks.
|
||
|
||
The user can also specify “remaining” as a size value for a volume in a disk
|
||
or in a volume group. When “remaining” is specified, all remaining free space on
|
||
the drive after allocations are made for all other volumes will be used for
|
||
this volume.
|
||
|
||
All the conversion is done in Ironic data driver, before the schema is mapped to
|
||
object model. Internally we continue to use MiB everywhere.
|
||
|
||
Alternatives
|
||
------------
|
||
|
||
None.
|
||
|
||
Implementation
|
||
==============
|
||
|
||
Assignee(s)
|
||
-----------
|
||
|
||
- max_lobur
|
||
|
||
Milestones
|
||
----------
|
||
|
||
See blueprint ref above.
|
||
|
||
Work Items
|
||
----------
|
||
|
||
- rebase on bareon master.
|
||
|
||
Dependencies
|
||
============
|
||
|
||
None.
|