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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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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. The backup folder is exposed across a network…
QFDev
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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 that get passed requests to their private…
JesseP
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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 network. Since the 3560X cannot be stacked, I…
IG83
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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 physical if it makes more sense) that host this web…
Marc
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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 supervisor is given the disk name slavedisk0 and…
user974896
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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 provide them with, e.g. smtp.mycompany.com. I…
Joshua Lim
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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 point my domain (e.g. domain.com) to both my…
Martin
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Is ntp.ubuntu.com redundant?

Does anybody know if Ubuntu's NTP servers are redundant? If I dig them, I get: ;; ANSWER SECTION: ntp.ubuntu.com. 280 IN A 91.189.94.4 vs. when I dig pool.ntp.org: ;; ANSWER SECTION: pool.ntp.org. 350 IN A …
Mike Crowe
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Adding redundancy to Hyper-V without a SAN

My organization has two identical servers, HP ProLiant DL380 G5. We do not have a SAN device. Each server has 8x 146GB HDD, and 48GB RAM. One server is currently configured as an Exchange server. The other server is configured as a virtual host,…
Mike Christiansen
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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 I'm still worried about what would happen if the…
Hari
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SQL server redundancy without failovercluster

I would like to know what the best way is failproof your SQL Server without using a failover cluster. A failover cluster requires an enterprise server which is not an option
Distracted
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Server mirroring strategy questions SQL Server replication, MySQL replication, file replication, etc

I'm working as an application developer for a company that I've been with for for some time. The business would like to mirror their existing windows server (server A) to a new server (server B) with the main aim of providing redundancy where either…
gbro3n
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Adding Redundancy to Win 2008 and SQL Server

We have an Amazon EC2 Windows Server 2008 with SQL Server running Email2Database and another SQL-based windows application. There is a lot of critical data on this box and we need to make sure that we keep this data protected and build in…
doremi
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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 an air conditioned space, one rack, A/B power and…
imthefirestartr
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Is the Blackberry "Move Server" command a reliable way to achieve redundancy?

BES supports moving more than one user in a domain to an alternate server as shown in the image below. Does this mean I could achieve some level of redundancy by moving users from one BES server to another? Is this a reliable approach with no…
makerofthings7
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