Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [redundancy]

Redundancy is the duplication of critical components or functions of a system with the intention of increasing reliability of the system, usually in the case of a backup or fail-safe.

300 questions
2
votes
2 answers

Two mirrored database servers, or one twice as powerful

I'm looking at setting up a seperate database server for one of my applications, the application currently runs on 3 servers; 1 frontend server and 2 application/database servers. But for performance reasons I'm looking to move the database onto…
user80776
2
votes
1 answer

Server redundancy or failsafe for small single office server

We run a local server in our office, and have a domain name pointed to it so we can test out sites we build. We also handle some image hosting for clients for emails. Since it's a single server, if it hangs and is unavailable so are the services we…
Richard Testani
  • 267
  • 1
  • 2
  • 8
2
votes
1 answer

What steps can I take to ensure that my rails app on heroku isn't effected by another ec2 outage?

My app is a victim of the recent EC2 outage and is still offline. The outage has negatively effected my business and the relationship we have with our clients. I'm hosting the app on heroku with their shared database plan. If a similar outage were…
James
2
votes
1 answer

Effects of having a rapid ARP flush

So the scenario is we have a web server at our colocation. In front of that web server are two SonicWalls and two L2 non-stacking managed switches. We're trying to find an efficient way to set up redundancy on all levels here (router, switch,…
Safado
  • 4,786
  • 7
  • 37
  • 54
2
votes
2 answers

Two hosting providers running simultaneously... possible / not possible? good practice / unnecessary?

For the sake of their reputation, I won't mention the names. But I'll just use: Business I worked for previously - ABC Web Dev Hosting company they used - XYZ Hosting I recently found out that XYZ Hosting had some sort of incident where they ended…
user29600
  • 419
  • 5
  • 17
  • 30
2
votes
3 answers

IRC Services with failover support?

I run a single server (call it 'server A') IRC 'network', and thank to the generosity of some friends, I have been given a second server ('server B') that I can run an IRCd on in order to provide redundancy in case server A crashes. This is fine, I…
insertjokehere
  • 123
  • 3
2
votes
4 answers

Question regarding uptime strategy for website

I'm working on a website where we need to have a good deal of uptime. Specially in the short bursts (15-day periods) that the website's events happen. The page is dead simple and can be served almost completely off an html cache. While there is a…
Julian
  • 545
  • 3
  • 6
  • 16
2
votes
2 answers

Can I get redundancy with a JBOD storage subsystem

I have a Promise Technology J610S. This is a JBOD subsystem. Is it possible for me to buy a SAS hardware RAID controller and provide some type of redundancy for these drives? I am unsure whether I will use Linux or Windows yet so an answer with…
Dat Chu
  • 181
  • 1
  • 9
2
votes
4 answers

Importance of Redundant Power Supply

How important are redundant power supplies in servers, not measured by how critical server uptime is, but by likelihood of failure? In other words, are server PSU's error prone and/or likely to fail within the first 3-4 years of service?
AX1
  • 1,289
  • 4
  • 24
  • 39
2
votes
3 answers

Aggregate multiple WAN connections (DSL, WiFi, WiMax) with a static IP, without BGP

Is it possible to use two VPN or MLPPP routers to aggregate, load balance, or fail over between WAN connections from a number of different providers? Two conditions: 1. We need to keep the external IP constant so we can SSH/VPN in and out, run…
Terence Johnson
  • 111
  • 1
  • 1
  • 6
2
votes
6 answers

Upgrade server software without blackout period

Say I've got a web application running on a Linux VPS box. In order to apply kernel upgrades and some security fixes, I'll need to reboot the server. During this period, the server isn't reachable. I'm wondering if it's possible to display a…
He Shiming
  • 283
  • 1
  • 3
  • 12
2
votes
3 answers

Is it possible to guarantee 100% uptime in redundant hosting servers inside a cloud computing structure?

I'm interested in find a hosting that can offer really 100% of uptime. Is it possible in hosting servers inside a cloud computing structure?
Paulo Coghi
  • 598
  • 2
  • 11
  • 22
2
votes
1 answer

Simplicity vs Redundancy

Assume you are tasked with running a set of mission critical web services with a targeted up time of 99.5% To achieve this, you have two identical clusters of hardware in two entirely separate data centers with different bandwidth providers etc. At…
SvrGuy
  • 1,012
  • 3
  • 17
  • 29
2
votes
2 answers

How do you ensure that two data network links have no SPOF?

How do you ensure that two data network links have no SPOF (Single Point of Failure)? We are working on a datacenter network connectivity and need to ensure that there will be no SPOF. We will have two network links to connect to the data…
Steven
  • 142
  • 10
2
votes
1 answer

How do I (automatically) re-attempt to deliver mail from a different Postfix server?

My network consists of two different locations and in both I have a Postfix server running for outgoing mail on each of them. Mail gets submitted to any of the two round-robin, based on having them both in DNS, e.g. smtp.mydomain.tld points to two…
gertvdijk
  • 3,504
  • 4
  • 30
  • 46
1 2 3
…
19 20