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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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Creating a redundant environment with ONLY 2 servers (so without a third server that handles the load-balancing)

First of all, i'm sorry if this question has been answered before, but i've been searching for a while now and couldn't seem to find (or understand) an answer. So, i have two physical servers with centOS on them. 1 of them is already hosting some…
Lars Behrens
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ensure "switch redundancy" on a network

I'm struggling in connecting two Windows 7 PCs (each with a 2 port Intel NIC) via two complete redundant paths. And I want to make it transparent to the services on that system. I was thinking on creating a Ethernet bridge on both NICs on each…
Hhut
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Speed up EIP reassignment

I have a real-time application running on an Amazon EC2 instance. I'd like to implement master/slave redundancy with a VPC, a second instance and keepalived. So far it's working reliably, but in the event of a failover, the EIP reassignment is…
Iskren
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Internet connection redundancy with 2 ISP

Setup is 1. One Linux server running web server and ftp server. 2. Two ISP which provided a range of public IP address 3. From the client(browser) side we can set only one of IP/domain name as target for web/ftp request. (Can not change the…
user2627240
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several domain controller logon

I've got two domain controllers. The master is DC01 and slave Fil01. I got that problem, that some computers logon over the slave dc and not the master. How can I set the order or prevent them on logon over the slave dc?
FV-Photography Mannheim
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Layer 3 switch redundancy solution (with vlan's, stp)

So basicly I have a setup which I want to get to work but i'm unable to. It's possible I am overseeing a lot of things but let's get to it anyways. The current situation is a network with 4 switches connected to each other (almost a full mesh, 1…
Ciberth
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Communication redundancy

I have a device that is connected to a switch and is then connected to a customer controller. I have been asked to make the connection to the controller redundant because they are very far apart from one another. In the case of one connection…
rawbus
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Providing redundancy for processes on different servers

Say I have for example 5 physical machines with similar resources (CPU speed, RAM and storage) named s1, s2, s3, s4 and s5. If I have a processes running on s1 but then s1 fails somehow, how can I automatically run that process on one of the other…
user2126881
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CARP Virtual IP does not ping in virtualized environment

We have three physical machines with SmartOS on them in a LAN. Two of them, 10.40.0.30 and 10.40.0.240 are hypervisors with two pfSense-based virtualized gateways on them. These gateways have 10.40.0.1 and 10.40.0.2 addresses, respectively. There is…
Alex
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Adding a second line to a domain

I'm running a Windows 2003 single domain network. We currently have a single connection line run in to an inbound nic in our ISA firewall. Outbound nic goes to a switch and from there to all other workstations / servers. I'm interested in adding…
JohnyD
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Can you recommend a failover solution for setups running multiple VPSes?

Here's what I have to work with: Root access to VPSes with different hosting companies that run CentOS only Two dedicated nameservers with over 100 zone entries Several webservers hosting the same content The failover solutions I've found…
Lin
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Where can one find good documentation describing memory-rank "sparing"?

Where can I find good documentation describing memory-rank "sparing" (for computer-hardware memory-protection configurations)? I'm seeking to clarify what benefits it provides and how it's typically implemented. I'd prefer vendor-neutral…
Johnny Utahh
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hosting a service locally and on amazon ec2 with auto-routing

I have a java REST service which is very CPU intensive. The service serves a website. I would like to host the service on my local machine which has 8 core 16GB RAM, SSD as the main storage and high speed internet connection with static IP. But, I…
Watt
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redundancy / load balancing on 2 unmanaged dedicated Windows-based servers

We normally host our dedicated servers in an unmanaged data centre, i.e we just purchase the server and we can manage it ourselves via remote desktop connection. We cannot install / configure any hardware in the data centre. Recently, we are…
Karl Cassar
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Setting up apache + mysql + exim on new servers. Redundancy/HA/Failover?

We are currently moving our single Linux server to a few other physical Linux servers, and would like to take the opportunity to have some more failover options. Backups are fine, and we don't "really" need HA, however, if we are looking at ~1 day…
jim
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