4 ms·

Most productions are fine with 99.9% uptime, and a single server is fine for that, so HA is not necessary for most production out there. For example, I'm runni

Most productions are fine with 99.9% uptime, and a single server is fine for that, so HA is not necessary for most production out there. For example, I'm running a governmental, nationwide service handling 300k req/day, with 1k admins working daily on the site, on a single server without anyone complaining, and without less than 99.9% uptime even though I reboot to upgrade the kernel twice a month, I did have to fine tune the system but that was actually pretty easy.

yoz-y 5y ago
That’s 10qps assuming working hours indeed you don’t need more than one server for that.
- 1337shadow 5y ago
  How many user facing projects actually got so far they needed more than one server? 1% of them?
  - bildung 5y ago
    I'd say even less - a single db server is almost enough for let's encrypt: https://letsencrypt.org/2021/01/21/next-gen-database-servers.html https://letsencrypt.org/2021/01/21/next-gen-database-servers...
hyperman1 5y ago
Quick calc: 99.9% of 365 means 8:45 downtime a year. That's not a lot, especially if hardware or power fails. In my personal experience, given a vendor SLA of 4:00 hours, Dell manages to send you replacement HW on time, but HP has up to now failed to deliver in window every time. YMMV of course. RAID is the only thing keeping us online in these cases. There is also the normal server maintenance. Rebooting a kernel twice a month, if the reboot takes 2 minutes, already swallows 48 minutes. Now to be honest 99.9% business hours only is mostly doable if you serve only 1 continent and manage to update/reboot outside business hours. I have a non-critical debian public web server running that updates and reboots every day at 3AM. Mostly because nginx didn't consistently apply lets encrypt certs. So far no one has noticed or at least complained.
- 1337shadow 5y ago
  If the server burns I'll just deploy another one from scripts and restore the data, I won't need to wait 4 hours I can do it right away, I will surely be able to do that in less than 8 hours!!! However, we don't own the servers, we just rent them from OVH, so we can spawn one in less than an hour and provision it in another, so maybe the fourth time my server actually completely burns in a year I will feel some kind of fear to do 99.8 instead of 99.9 :'''( <--- these are many tears. Funny to see my above comment get a final score of -4, people don't like us saying "well just get a cheap linux box and we'll get you 99.9% uptime" ahah and this is "hacker news"! Not to mention the comment that was like "you can't do production without HA", I have been developing, deploying, maintaining a bunch of productions for the last 20 years and very very few of them needed any kind of HA. Anyway, with that experience I can get you >99.9% uptime with a 3 buck/month linux box, or HA for anything above 99.9, cause that's what experience is about kids ;)

yoz-y 5y ago

That’s 10qps assuming working hours indeed you don’t need more than one server for that.

1337shadow 5y ago
How many user facing projects actually got so far they needed more than one server? 1% of them?
- bildung 5y ago
  I'd say even less - a single db server is almost enough for let's encrypt: https://letsencrypt.org/2021/01/21/next-gen-database-servers.html https://letsencrypt.org/2021/01/21/next-gen-database-servers...

hyperman1 5y ago

Quick calc: 99.9% of 365 means 8:45 downtime a year. That's not a lot, especially if hardware or power fails. In my personal experience, given a vendor SLA of 4:00 hours, Dell manages to send you replacement HW on time, but HP has up to now failed to deliver in window every time. YMMV of course. RAID is the only thing keeping us online in these cases. There is also the normal server maintenance. Rebooting a kernel twice a month, if the reboot takes 2 minutes, already swallows 48 minutes. Now to be honest 99.9% business hours only is mostly doable if you serve only 1 continent and manage to update/reboot outside business hours. I have a non-critical debian public web server running that updates and reboots every day at 3AM. Mostly because nginx didn't consistently apply lets encrypt certs. So far no one has noticed or at least complained.

1337shadow 5y ago
If the server burns I'll just deploy another one from scripts and restore the data, I won't need to wait 4 hours I can do it right away, I will surely be able to do that in less than 8 hours!!! However, we don't own the servers, we just rent them from OVH, so we can spawn one in less than an hour and provision it in another, so maybe the fourth time my server actually completely burns in a year I will feel some kind of fear to do 99.8 instead of 99.9 :'''( <--- these are many tears. Funny to see my above comment get a final score of -4, people don't like us saying "well just get a cheap linux box and we'll get you 99.9% uptime" ahah and this is "hacker news"! Not to mention the comment that was like "you can't do production without HA", I have been developing, deploying, maintaining a bunch of productions for the last 20 years and very very few of them needed any kind of HA. Anyway, with that experience I can get you >99.9% uptime with a 3 buck/month linux box, or HA for anything above 99.9, cause that's what experience is about kids ;)