November 2024
Intermediate to advanced
552 pages
18h 42m
French
book
Ingénierie de la fiabilité des sites
by Niall Richard Murphy, Betsy Beyer, Chris Jones, Jennifer Petoff
Content preview from Ingénierie de la fiabilité des sites
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Annexe A. Tableau de disponibilité
La disponibilité est généralement calculée en fonction de la durée d'indisponibilité d'un service sur une certaine période. En supposant qu'il n'y ait pas de temps d'arrêt planifié, le tableau A-1 indique combien de temps d'arrêt est autorisé pour atteindre un niveau de disponibilité donné.
| Niveau de disponibilité | Fenêtre d'indisponibilité autorisée | |||||
|---|---|---|---|---|---|---|
|
par an |
par trimestre |
par mois |
par semaine |
par jour |
par heure |
90% |
36,5 jours |
9 jours |
3 jours |
16,8 heures |
2,4 heures |
6 minutes |
95% |
18,25 jours |
4,5 jours |
1,5 jours |
8,4 heures |
1,2 heures |
3 minutes |
99% |
3,65 jours |
21,6 heures |
7,2 heures |
1,68 heures |
14,4 minutes |
36 secondes |
99.5% |
1,83 jours |
10,8 heures |
3,6 heures |
50,4 minutes |
7.20 minutes |
18 secondes |
99.9% |
8,76 heures |
2,16 heures |
43,2 minutes |
10,1 minutes |
1,44 minutes |
3,6 secondes |
99.95% |
4,38 heures |
1.08 heures |
21,6 minutes |
5,04 minutes |
43,2 secondes |
1,8 secondes |
99.99% |
52,6 minutes |
12,96 minutes |
4,32 minutes |
60,5 secondes |
8,64 secondes |
0,36 secondes |
99.999% |
5,26 minutes |
1.30 minutes |
25,9 secondes |
6,05 secondes |
0,87 secondes |
0.04 secondes |
L'utilisation d'une mesure d'indisponibilité globale (c'est-à-dire"X% de toutes les opérations ont échoué") est plus utile que de se concentrer sur la durée des interruptions pour les services qui peuvent être partiellement disponibles - par exemple, en raison de l'existence de plusieurs répliques, dont certaines seulement sont indisponibles - et pour les ...
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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.