April 2025
Intermediate to advanced
552 pages
17h 42m
Italian
book
Ingegneria dell'affidabilità dei siti
by Niall Richard Murphy, Betsy Beyer, Chris Jones, Jennifer Petoff
Content preview from Ingegneria dell'affidabilità dei siti
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
Appendice A. Tabella di disponibilità
La disponibilità viene generalmente calcolata in base al tempo in cui un servizio non è stato disponibile per un certo periodo. Supponendo che non ci siano tempi di inattività programmati, la Tabella A-1 indica la quantità di tempo di inattività consentita per raggiungere un determinato livello di disponibilità.
| Livello di disponibilità | Finestra di indisponibilità consentita | |||||
|---|---|---|---|---|---|---|
|
all'anno |
per trimestre |
al mese |
a settimana |
al giorno |
all'ora |
90% |
36,5 giorni |
9 giorni |
3 giorni |
16,8 ore |
2,4 ore |
6 minuti |
95% |
18,25 giorni |
4,5 giorni |
1,5 giorni |
8,4 ore |
1,2 ore |
3 minuti |
99% |
3,65 giorni |
21,6 ore |
7,2 ore |
1,68 ore |
14,4 minuti |
36 secondi |
99.5% |
1,83 giorni |
10,8 ore |
3,6 ore |
50,4 minuti |
7,20 minuti |
18 secondi |
99.9% |
8,76 ore |
2,16 ore |
43,2 minuti |
10,1 minuti |
1,44 minuti |
3,6 secondi |
99.95% |
4,38 ore |
1,08 ore |
21,6 minuti |
5,04 minuti |
43,2 secondi |
1,8 secondi |
99.99% |
52,6 minuti |
12,96 minuti |
4,32 minuti |
60,5 secondi |
8,64 secondi |
0,36 secondi |
99.999% |
5,26 minuti |
1,30 minuti |
25,9 secondi |
6,05 secondi |
0,87 secondi |
0,04 secondi |
L'utilizzo di una metrica di indisponibilità aggregata (ad esempio,"l'X% di tutte le operazioni non è andato a buon fine") è più utile che concentrarsi sulla durata delle interruzioni per i servizi che possono essere parzialmente disponibili (ad esempio, a causa della presenza di più repliche, di cui solo alcune non sono disponibili) e per i servizi il cui carico varia nel corso di un ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.