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.
Questions tagged [redundancy]
294 questions
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High Available service - IP/DNS single point of failure
I'm looking for High Available solution for websites and already find
Kubernates , Docker Swarm ... but all these things should balance only webserver , db and other running service in the cluster. But what about the IP addresses DNS.
Let's assume…
DobriL DobriLov
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How many drives can fail in an Xserve RAID in RAID 0+1?
I’m torn between what I know (or think I do) and what Apple’s documentation states.
The hypothetical setup I’m considering is what is described as RAID 0+1 in Apple’s documentation for the Xserve RAID, which usually means a mirror of two striped…
kumowoon1025
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Backup DNS servers for a domain name - optimal configuration and troublehooting
Let's say we have these name servers for 1 domain.
ns.1.com
ns.2.com
ns.3.com
ns.4.com
backup-ns.1.com
backup-ns.2.com
How can I know which NS responded to this specific query, for example using dig? Taking into account DNS cache.
In a normal NS…
Mindaugas Bernatavičius
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2 answers
Fallback between datacenters
What is the best way to do a fallback between datacenters. We have a dedicated server in one of the data centers and as our traffic increased i wanted to add more then backup i wanted redundancy and load balancing.
The thing that happened in the…
disi
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Need some clarification on a NIC functionality on a Dell Poweredge r610
Quick question. I'm trying to understand the NIC functionality of this server. NIC specs from manual:
My question is, do the two broadcom controller chips provide fail-over redundancy? For example, is it design intention that if a controller chip…
user1330287
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VM migration and IP address
When a VM offering a service is migrated to a different server is it an important requirement from the client applications point of view to retain the same IP the VM had before ?
For long lived TCP sessions it won't make a difference because the…
Manohar
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Distributed (serverless) Database System
I've currently a setup where 10 database clients access one (Postgres)-SQL server on the same network. The applications have a very low db footprint. They do load a few tables upon startup and do quite few operations during runtime (maybe 100 ops…
Hhut
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Teaming the 2 ports of a hp 361T pcie Dual port GB Nic
We have a network with two switches stacked for redundancy. We have a HO 36LT PCI-e Dual port NIC and an Intel x520 10GbE port adapter.
I want to be able to assign one IP address for both ports. I will one port to one switch, and the other port to…
DavyGravy
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What are common server architectures to build a reliable website
Sorry, if my question looks too general, but I am looking for an answers to specific problems that I listed below and would appriciate any help.
My website is growing in popularity and I would like to provide a consistant service for my users. Now I…
Temnovit
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Rapid failover from one data center to another when the first goes down?
I'm building a global CDN and have a DNS service that will direct customers to the closest server. However I need rapid failover if one of the data centers e.g. Germany goes down users need to be instantly served from London.
The DNS service I'm…
Mark172
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Does chassis mid-plane provide load balancing for power supply
I am new to blade chassis management, and i want to know what is the purpose of mid plane apart from connectivity. Does it provide load balancing among the power supplies. If so does that mean it automatically ensures power supply redundancy or for…
Chu
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How to achieve redundancy with layer 2 switches only in network?
I am trying to find out way to make network design with only simple un-rooted switches which avoid redundancy!
I use 2 computers & 2 simple switches each switch connect to one pc & between both switch I connect 2 wires for check redundancy. But as…
Mandar Khire
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Two drives, how can i max reliability and uptime?
I have an asterisk pbx. It has 2 drives in a raid 1 setup.
However if my main drive fails my 2nd won't boot, as it has no boot partition.
The most important thing for me is up time. If there is a power outage and or a drive failure I'd like the…
wlraider70
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Redundant Connection Issue
I'm trying to set up a redundant connection for our web hosting servers. I have a BGP-capable router connecting two lines from two separate ISP's, one fiber (primary), one DSL (failover). I've already confirmed that I can push routes into the DSL…
Adam
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Overview of multiple mx server set up
Would someone please show me the overview of how multiple mx for a single domain is set up to communicate with each other?
I am not talking about how to configure the postfix or DNS mx entries, I am talking about the network diagram and the sequence…
Jake
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