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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.

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Configure fallback redis server

I am using redis as a cache server. Can I somehow configure multiple redis servers, that the cache is fully functional (read/write) even if some of them go offline? I looked into master->slave, but the problem I see there is, that if the master…
snøreven
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Redundant Linux Servers in Seperate Datacenters

I have 2 CentOS linux servers in separate data centers on each site of the country. These linux machines run a small web sites on Apache with a MySQL backend. There currently is no VPN connectivity between them at this time and the only way they…
jinanwow
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Redundant NFS on Amazon EC2

I'm interested in building two fault tolerant/redundant NFS servers with failover at Amazon EC2. I'm familiar with tools/technologies like DRBD, Heartbeat, etc. Does Amazon provide any specific way of achieving this through their platform? A…
Trent Scott
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What hardware & software consideration does a major website require to properly manage 1000+ servers?

Sorry for such a high level question. I understand the basics of server load balancing, but the concept of managing 30,000 servers is a bit foreign to me. Is it really just the same concept of balancing 2 or 3 servers scaled up 10,000 times? How…
Jonathan Coe
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Should redundant servers have exactly the same configuration, or slightly different?

If you provide a service on two servers to ensure high-availability, is it better to configure them in exactly the same way, of instead should you introduce slight differences to prevent "freak configuration" errors? We host a Django-based website…
Jan Fabry
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Is it possible to use mixed 110V / 208V power on a single server with dual power supplies?

Is it possible to run a dual power supply server with one PS plugged into 110V, and the other power supply plugged into 208V? We've asked the vendors and they say they've never tested it or some other "i dunno" type of answer. The power supplies…
Nathan Neulinger
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Howto create redundant network on server

I am in the situation where I have a number of CentOS Linux servers which all have two NIC interfaces. Currently one of these interfaces is used for internal communication, the other is used for external (internet) communication. Both of the NIC's…
Reinoud van Santen
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Two domain controllers - yet when primary is down, domain still fails?

I have multiple windows 2003 servers support a particular network, and when one particular server is taken offline, domain services begin to rapidly fail, such as users couldn't login. What check list shall I look into to ensure that I can take my…
Mister IT Guru
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System Monitoring Redundancy

I consult in a small business environment where I have two HyperV hosts (with <10 VMs) + a couple other servers. I recently had an issue where one of the HyperV hosts had a CPU issue and it came down, bringing most of my non-critical VMs with it,…
Josh Brower
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Recommendation for a small redundant VM infrastructure?

We currently have an active-active 2 node cluster running virtual machines. Every node has two disks, every disk is DRBD mirrored on the other node. Every node runs virtual machines out of his primary drbd device, and the pacemaker cluster will…
Luke404
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How to achieve redundancy across data centers?

I have a LAMP server with a lot of hardware redundancy built in. I am not worried about the server becoming unavailable. What I am worried about, however, are potential network issues in the data center the server is in. What I would like to have is…
BrandonBT
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Network Redundancy Example

Looking for help filling in how redundancy in the following model might work: alt text http://www.kbrandt.com/files/NetworkSample.jpg I believe my Datacenter will give me redundant gateways with two hand offs (going to have to talk to the more about…
Kyle Brandt
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Redundant network connections for website

We are in the process of building a new secure web application for our company, and are looking at options for ensuring redundancy in our data center. We don't have a lot of money, but have relatively high bandwidth requirements, so have considered…
Beep beep
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Openstack redundant architecture on three servers

I would like to deploy an Openstack architecture on three (super)servers in a way that if one of server is down the Openstack infrastructure is still functionning. What is the best way to deploy this ? Is deploying Control, Network and Compute…
SwissFr
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Can my redundant network setup be made more robust?

With my current design I have a DL380 Gen9 running ESXi. It has redundant NICs cabled to two different switches. Those switches in turn are both cabled to a third switch that allows my workstation to be connected. My testing so far has shown the…
Digital ink
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