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.

learn more… | top users | synonyms

2
votes
4answers
63 views

new hyper V High Avaliability setup and SMB 3.0 storage

I am looking at building an new 2012 R2 with Hyper V setup, everything has to be HP hardware. 2x HyperV 2012 R2 servers running 20-30 VMs. These will be dual 6 core xeons with 128gb of ram. 2x 2012 ...
3
votes
1answer
94 views

SonicWALL HA w/ Dual WAN HSRP from two redundant switches

We're adding two SonicWALL NSA 2600 firewalls to our current setup. We currently get two WAN connections from two separate Cisco routers running on the same external subnet with what I believe is ...
1
vote
2answers
62 views

Redundant routing (active/backup) on linux

I'm currently trying to setup a redundant routing on RHEL 5. The target goal is to have a primary route to a subnet and a backup route to that subnet, to be used only if the gateway of the primary ...
0
votes
1answer
10 views

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 ...
3
votes
3answers
170 views

How much failover redundancy is enough? [closed]

I'm working on a client-server system where all clients currently submit their transactions to essentially a single west-coast IP address to reach what is called the "gateway" application. The ...
0
votes
0answers
18 views

Is it possible to have VOIP and data share a common fail-over connection?

Internally, VOIP and data services are wired separately. They operate on two mutually exclusive networks, with separate broadband connections. Currently, there is no fail-over backup for VOIP ...
1
vote
0answers
30 views

What are some good solutions for fully redundant IIS/MySQL hosting? [closed]

We've got a web app and public API for an iOS app that is built using classic ASP running on IIS along with a MySQL Server back-end. Can anyone recommend some options for a fully redundant hosting ...
2
votes
2answers
54 views

redundancy in a single SCSI target

following-on from my earlier question about resurrecting an ancient Intergraph 6800 machine (licence file for extra logins on ancient Unix (CLIX) system), the original problem was a failed hard disk ...
2
votes
0answers
118 views

HyperDB Configuration Master/Slave

Running on server 2008 R2 IIS 7.5, with a MySQL Master/Slave (also on server 2008 r2), and WordPress 3.7. Is it ONLY compatible with wordpress 3.5.2? If that is so is there any other plugins to allow ...
0
votes
0answers
21 views

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 ...
2
votes
2answers
275 views

Is round-robin DNS a possible solution for high availability?

Let's say I have 2 IPs for a given domain (round-robin DNS). If one the IPs becomes unresponsive, will clients try to connect to the other IP? or they will just fail to establish comunication with the ...
1
vote
1answer
57 views

Redundant OpenVPN tunnel

I'm trying to set up a fully redundant OpenVPN tunnel, with two routers on each side. All the tutorials I saw (such as ...
-2
votes
1answer
81 views

Can I implement network redundancy just with static routing tables?

I have a Windows 2003 server which is connected to a router at 192.168.15.1 via 192.168.15.10. I also have a linux server connected to that same router via 192.168.15.90. And I have a direct ...
1
vote
1answer
96 views

Redundant web static content storage - what technologies? (small scale) [closed]

Current situation of our static web servers: 2x 2U servers full of SSDs (raid5) for storing data data are written to them only through our applications (*) huge amount of small image files (one ...
0
votes
2answers
75 views

web server redundancy in case of network failure

I have a (web) server at a datacenter, which at times (as all datacenters do) has network failures (for like 10-30 minutes). I have a second server at a different company (datacenter) which I could ...
8
votes
1answer
195 views

VMware vSphere cluster design for site redundancy

I have a question about the best design for site redudancy when using vSphere clusters. A bit of background info about our situation first though. We are a medium-sized company with two main ...
0
votes
0answers
64 views

Infiniband dual-port redundancy

I want to setup redundant infiniband networking. I am going to use servers (Centos 6.4) with dual-port IB adapters (Mellanox Connect-X III series) and two unmanaged IB switches. I know that IB paths ...
0
votes
1answer
37 views

munin-node send data to more than one master?

I'm in the process of making everything on our server setups redundant, and so comes the monitoring. We have one virtual machine acting as munin master and all other virtual machines are munin nodes ...
-1
votes
1answer
53 views

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 ...
2
votes
1answer
137 views

Simple redundancy setup using two servers in two different datacenters? [closed]

Scope of the question This question is solely about getting a client requesting a domain: example.com to one of the two available servers. How it is handled from there on, is another problem to solve ...
3
votes
3answers
154 views

Probability of Blade Chassis Failure, Redundancy

Suppose I have a blade server HP C7000, with three blades. Q1. Is there any disaster recovery technique that provides redundancy between blades? If any one blade goes down the second should come up ...
4
votes
1answer
127 views

DRBD for HA Server in Small Office Questions

Backround: We are in need of a HA server in a small office environment and are looking at DRBD to provide it. We only have about 100GB that needs to be on the HA server and server load will be ...
-5
votes
1answer
88 views

Loadbalance between Heroku and AppHarbor? [closed]

How would you set up simple redundancy between these 2 "cloud" providers? Does a DNS fallback seem reasonable (that would update records when one is down) or would it take too long to propragate the ...
0
votes
1answer
36 views

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 ...
0
votes
1answer
89 views

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 ...
0
votes
1answer
84 views

Software for syncing two folders?

I have a SQL Database that is running 15 minute backups to a folder on the local disk. I also have a maintenance task in SQL Server that's automatically deleting any backups that are over 1 hour old. ...
2
votes
1answer
162 views

Same VRRP group, multiple VLAN

Let's say a gateway has traffic between vlan 11 and 22: Gateway 1 -- FastEthernet 0/1.1 -- vlan 11 -- 192.168.11.1 Gateway 1 -- FastEthernet 0/2.2 -- vlan 22 -- 192.168.22.1 Gateway 2 -- ...
-1
votes
3answers
91 views

Two drives, how can i max reliability and uptime? [closed]

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 ...
0
votes
0answers
9 views

Barracuda Like Email forwarding to multiple servers

I'm working on a system that needs to send Email for accounts on our old system to a server based on the a set of Mailbox names, and all the rest to our email queuing system. Please forgive me if my ...
2
votes
2answers
430 views

Server Backup Strategy for Amazon EC2

Where and how should I backup my EC2 / EBS based snapshots OUTSIDE of EC2? EC2 provides a great product with their EBS based snapshots. However it is also a high risk point that someone could ...
6
votes
1answer
219 views

How do I configure NAT rules when using ASA IP-SLA when leveraging post-ASA-8.3 NAT syntax?

We are currently running ASA9 at a location with redundant ip connectivity. We'd love to configure ip sla so that internet access survives a single carrier outage. I'm aware of the ip sla commands, ...
0
votes
1answer
171 views

What is the best option for SIP service redundancy?

From your practical experience, what is the best option for SIP service redundancy? a) one SRV record pointing to a hostname which has two A records b) two SRV records pointing to two different ...
2
votes
1answer
106 views

Cisco 6500 vss mode upgrade

This is not my network. I'm trying to understand why my cloud provider insists that they need to take down both routers when performing updates. From what I understand they have 2 Cisco 6500s ...
0
votes
1answer
109 views

What's the best way to run HAProxy backup as another HAProxy server and avoid cyclical issues

I have several geographical regions for my service deployment, say Region1, Region2, and Region3. Each region has a failover haproxy instance. Each haproxy is configured with several backend servers ...
3
votes
3answers
789 views

A-Record Failover?

I have a Fortigate 100D with 2x BT Business Infinity Fibre connections acting as WAN1 & WAN2. The BT lines come with 5 static public IPs each and I have my DNS hosted through CloudFlare pointing ...
0
votes
2answers
320 views

Redundancy scenarios for a small network centered around a Cisco 3560X switch

As the title says, I manage a small network which uses a Cisco 3560X as the core switch. We have recently got a 2nd identical switch and I have started thinking about how to add some redundancy to the ...
2
votes
2answers
125 views

A and PTR records and redundant Internet connections

Want to set up PTR record(s) to handle the following: Site with mail server (Exchange 2010) has three Internet connections, with the firewall handling load balancing. I know that if the Internet ...
0
votes
1answer
181 views

How to setup cluster of virtual machines to host web application with fail-over redundancy?

I would like to know how to setup a cluster of virtual machines to host a web application. We are expecting a high volume of clients connecting. I would like a cluster of virtual machines (or ...
0
votes
1answer
245 views

Networking: Does slavedisk0 take over for disk0 in the event of a fault?

My bootvar is set to boot up images from disk0. The 6500 series switch has two redundant supervisors. Each supervisor has a PCMCIA card with the exact same IOS images in the 0 slot. The secondary ...
0
votes
1answer
159 views

How to setup a failover solution for Windows 2003 SMTP Server?

I'm currently running Windows SMTP Server on a rented Windows 2003 Server VM. There are times when my hosting company network is down and my clients can't send their emails via the SMTP Server host I ...
42
votes
7answers
3k views

Probability of Blade Chassis Failure

In my organisation we are thinking about buying blade servers - instead of rack servers. Of course technology vendors also make them sound very nice. A concern, that I read very often in different ...
3
votes
1answer
520 views

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 ...
1
vote
2answers
339 views

Record DNS for 2 static ip - fault tolerance

i've a web server in a DMZ reachable from 2 different public static ip addresses provided by 2 different internet connection by 2 different ISPs. I want to create a record let's say ...
0
votes
1answer
55 views

Preparing a server for mysql replication and use it as standalone

I want to host an application on a single server running MySQL server. To get the best performance I plan on using a UNIX socket connection (to avoid TCP overhead). Later, I would like to scale up by ...
0
votes
2answers
83 views

Domain name to point to 2 different servers

I'm looking to setup cheap redundancy for a website, such that I signup with 2 separate shared hosting accounts. The likelihood of both being down at the same time would be small. Is there a way to ...
1
vote
2answers
265 views

Basic redundancy for EC2 (wordpress + mysql)

I've got a website that I would like to add redundancy to. It's not a massive website, and will probably only receive a handful of database updates and/or files per day, however it's very important ...
1
vote
2answers
89 views

High available and secure FrontEnd to WebApps behind a firewall [closed]

my question is about proposed implementation of high available and secure FrontEnd to WebApps behind a firewall. The components of the network and their relationships are as follows: 1) 2 WebApps ...
1
vote
1answer
88 views

ISP Redundancy Hardware

I've tested Microsoft TMG 2010 to load balance my two DSL lines and it works fine. Can I expect the same level of results and security to be achieved with a less expensive firewall appliance?
-3
votes
1answer
232 views

Email server - redundant, mobile, and secure [duplicate]

Possible Duplicate: 100% uptime for a web application I wish to create my own personal email server. I can't have any downtime - so I have 3 machines at different IP adresses around the ...
1
vote
2answers
163 views

Servers configuration to improve performance and offer redundancy for ASP.NET site with SQL Server

I'm administrating a fairly large website (currently about 300 thousand page views a day) which is expected to grow fast. Currently both IIS and SQL Server are running in a quad core server, with RAID ...