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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Providing internet redundancy for our colocation provider

My company recently had an network outage at our colocation facility that is serving our main website. The outage was caused by an upstream switch failure. I was told by my ISP (who provides us with ...
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244 views

Is it possible to do storage without RAID and unnecessary redundancy?

I'm building multiple storage nodes for Riak database. Each node contains 20-40 x 2TB drives. Riak replicates each save to 3 nodes so there I have redundancy. Now the question is that what's the best ...
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148 views

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 ...
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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 ...
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121 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 ...
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114 views

Branch Office Switch Redundancy

We're setting up a branch office with no dedicated IT person (all IT support is remote from HQ) and trying to make the infrastructure as redundant as possible. We've dealt with Internet and power, but ...
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71 views

Redundance for different processes running on the same server

We have a system consisting of different components/services like database, webserver, fileshare, some self programmed daemons, etc. We now have the requirement to make all components/services ...
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170 views

Amazon EC2 SQL Instance with Cheap redundancy

I'm looking at transitioning from a dedicated hosting provide to Amazon's EC2 instances. The website is an asp/asp.net website with SQL Server 2008 as it's backend. It has zero redundancy as is ...
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Redundant Firewalls And Switches HSRP and CARP

I currently have planned 2 x uplinks (HSRP Active/Standby) 2 x pfsense firewalls (Carp Enabled) 2 x layer2 switches Please criticize or offer help on the correct way to do this. I have a feeling im ...
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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 ...
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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 ...
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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 ...
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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 ...
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VPN Redundancy - One NIC with two DMZ IPs or Two NICs each with a DMZ IP address

Currently, I have setup on NIC card with two DMZ IP addresses. We are having weird issues with the connection, where sometimes servers aren't accessible. I have another NIC card other than the ...