January 2019
Beginner to intermediate
228 pages
2h 28m
Japanese
Content preview from 入門 監視 ―モダンなモニタリングのためのデザインパターン
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付録B可用性表
4章で取り上げたように、表B-1は可用性の数字をまとめた表です。定められた可用性を実現するのにどのくらいのダウンタイムが許容されるのかを判断するのによい資料になります†1。
表B-1 可用性表（Wikipedia［https://en.wikipedia.org/wiki/High_availability］より）
| 可用性（%） | 年あたりダウンタイム | 月あたりダウンタイム | 週あたりダウンタイム | 日あたりダウンタイム |
|---|---|---|---|---|
| 90%（ワンナイン） | 36.5日 | 72時間 | 16.8時間 | 2.4時間 |
| 95% | 18.25日 | 36時間 | 8.4時間 | 1.2時間 |
| 97% | 10.96日 | 21.6時間 | 5.04時間 | 43.2分 |
| 98% | 7.30日 | 14.4時間 | 3.36時間 | 28.8分 |
| 99%（ツーナイン） | 3.65日 | 7.20時間 | 1.68時間 | 14.4分 |
| 99.5% | 1.83日 | 3.60時間 | 50.4分 | 7.2分 |
| 99.8% | 17.52時間 | 86.23分 | 20.16分 | 2.88分 |
| 99.9%（スリーナイン） | 8.76時間 | 43.8分 | 10.1分 | 1.44分 |
| 99.95% | 4.38時間 | 21.56分 | 5.04分 | 43.2秒 |
| 99.99%（フォーナイン） | 52.56分 | 4.38分 | 1.01分 | 8.64秒 |
| 99.995% | 26.28分 | 2.16分 | 30.24秒 | 4.32秒 |
| 99.999%（ファイブナイン） | 5.26分 | 25.9秒 | 6.05秒 | 864.3ミリ秒 |
| 99.9999%（シックスナイン） | 31.5秒 | 2.59秒 | 604.8ミリ秒 | 86.4ミリ秒 |
| 99.99999%（セブンナイン） | 3.15秒 | 262.97ミリ秒 | 60.48ミリ秒 | 8.64ミリ秒 |
| 99.999999%（エイトナイン） | 315.569ミリ秒 | 26.297ミリ秒 | 6.048ミリ秒 | 0.864ミリ秒 |
| 99.9999999%（ナインナイン） | 31.5569ミリ秒 ... |
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.