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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11answers
2k views

How far should we take the N+N redundancy craziness?

The industry standard when it comes from redundancy is quite high, to say the least. To illustrate my point, here is my current setup (I'm running a financial service). Each server has a RAID array ...
10
votes
9answers
14k views

Correct way to set up DNS primary/secondary/… for redundancy and latency reduction?

I thought DNS primary/secondary for redundancy purposes was straightforward. My understanding is that you should have a primary and at least one secondary, and that you should set up your secondary in ...
1
vote
6answers
787 views

Server Failover Scenario

I've got two Dell PowerEdge 2950 servers. In order to (hopefully) eliminate any downtime, I must implement a solution to detect and adjust to component failures, environment failures, etc ... the ...
3
votes
4answers
12k views

Split your DHCP scope among multiple servers?

I want to implement a redundancy solution. I have two subnets all windows XP machines - each with their own DHCP server - joined by a bridge. Currently - all machines get DHCP leases from the one ...
7
votes
5answers
2k views

Local to Remote Webserver Failover

Short and sweet, I don't suppose you'll need more detail than this: We host our website on an in-house webserver. A catastrophe has and will happen again where communication from the web into/out ...
2
votes
5answers
756 views

Self-healing archive file format with redundancy

When I used RAR, I had an option to add some extra recovery data in order to be able to cope with a not-perfect medium (think floppy disks). It saved my day several times, specially when dealing with ...
13
votes
21answers
5k views

When is RAID worth the trouble?

In our shop we're faithfully using RAID in all our workstations, probably just because that seems to be the way it ought to be done. I'm talking about workstations for scientific simulations, using ...
2
votes
6answers
230 views

Upgrade server software without blackout period

Say I've got a web application running on a Linux VPS box. In order to apply kernel upgrades and some security fixes, I'll need to reboot the server. During this period, the server isn't reachable. ...
1
vote
2answers
486 views

Data Backup redundancy/backups

I am looking at setting up a backup solution... well including in my backup solution actually... an external harddrive on my main file server. I then use something like Microsoft SyncToy to 'sync' ...
5
votes
3answers
540 views

SQL Server clustering options

Can anyone give an high-level overview of the options available for SQL Server clustering, their pros and cons? Is it better to use Microsoft Clustering services or SQL Server native clustering? Does ...