Talk:Availability
![]() | This article is rated Start-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||||
|
Definition
[edit]Some content has been moved to Forty-nine charismatic virtues. Peter Manchester 13:15, 25 Nov 2003 (UTC)
I'm trying to find a definition of Availability that can be sensibly used in a legal document relating to a web site hosting service. The current definition on Wikipedia doen't seem to fulfil this requirement. I'm sure there is a service-related definition of Availability in ITIL somewhere, but I haven't yet found it. Can anybody help with this?
Dubious definition
[edit]The article states the following:
Limiting (or steady-state) availability is represented by[citation needed]
Limiting average availability is also defined on an interval as,
I don't see how this can be accurate, however. The steady-state availability definition as stated doesn't look like it would converge. This appears to be more of an "instantaneous" availability that is evaluated as t gets large, which seems like a dubious procedure to me. I suspect a definition like:
is probably more accurate for steady-state (limiting) availability. 70.250.239.119 (talk) 02:22, 23 August 2010 (UTC)
Inherent and Operational Availability
[edit]I read earlier today on Talk:Mean down time:
From Jones, Logistics Support Analysis Handbook (TAB Books inc.), the time clock for MTTR starts and ends only with the corrective maintenance cycle (fault detection, isolation through checkout). MDT accounts for all including delays where spares, support personnel or tools are not immediately available. MTTR is used in calculating Ai (Inherent Availability) where MDT is used in calculating Ao (Operational Availability).
This is good info, I'd like to include it, but I'm not sure what the best way to do that is. At a minimum, I believe the article needs to mention inherent availability and operational availability. 70.250.239.119 (talk) 02:30, 23 August 2010 (UTC)
Mission Capable Rate
[edit]The military's notion of mission capable rate is a special case of system availability, so I've linked a number of pages that mention this term to this page. We should probably redirect mission capable rate to this page also. 70.250.190.30 (talk) 00:31, 19 September 2010 (UTC)
- Sounds swell. I've created the redirect. bahamut0013wordsdeeds 02:53, 19 September 2010 (UTC)
Available isn't available ?
[edit]The current definition seems MIL-STD based, should there be mention of alternative views?
For example in Semiconductor Equipment and Materials International SEMI-E10 specification or Reliability, Availability, and Maintainability, see http://www.semi.org/en/Standards/CTR_031244 -- see paper on Measuring Supercomputer RAS. I've also seen Availability and the different ways to calculate it
The alternative seems looking from a viewpoint of post-fact reporting on actual production measurements rather than a calculated KPP. I'm also thinking the military KPP usage has availability measured against time supposed to be up -- so 'scheduled downtime' does not count - and the SEMI usage has any downtime counted as downtime, and then focuses on how much uptime went to engineering tasks, idle time, and how much of actual runtime is in restart and rework time.
Anyone have viewpoint on including other measures in the article ? Markbassett (talk) 20:56, 30 July 2015 (UTC)
External links modified
[edit]Hello fellow Wikipedians,
I have just modified 3 external links on Availability. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
- Added archive https://web.archive.org/web/20140413164657/https://dap.dau.mil/glossary/Pages/2045.aspx to https://dap.dau.mil/glossary/Pages/2045.aspx
- Added archive https://web.archive.org/web/20140413164705/https://dap.dau.mil/glossary/Pages/1380.aspx to https://dap.dau.mil/glossary/Pages/1380.aspx
- Added archive https://web.archive.org/web/20130312154509/https://dap.dau.mil/glossary/Pages/Archived/1476.aspx to https://dap.dau.mil/glossary/Pages/Archived/1476.aspx
When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{Sourcecheck}}
).
This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}}
(last update: 5 June 2024).
- If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
- If you found an error with any archives or the URLs themselves, you can fix them with this tool.
Cheers.—InternetArchiveBot (Report bug) 09:08, 22 October 2016 (UTC)
Unnecessarily formal and verbose first sentences.
[edit]As a reader coming from the CAP theorem article via a link to "Availability", the leading definitions in this article do not help me to understand what Availability means at a high level.
The CAP article, with which this article is linked (implying they refer to the same "Availability") states:
"Availability: Every request receives a (non-error) response, without the guarantee that it contains the most recent write"
This article does not cover that definition, or if it does, it does it in an overly formal way from the get-go. AnonGUser (talk) 17:59, 2 October 2019 (UTC)
Start a discussion about improving the Availability page
Talk pages are where people discuss how to make content on Wikipedia the best that it can be. You can use this page to start a discussion with others about how to improve the "Availability" page.