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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 redundant IPSec connections using OpenSwan

I have a linux (netkey) instance with openswan installed, the instance has two connection to the same IPSec peer that needs to act as redundant connections. both connections' properties are the same (except for the peer's IP addresses and the right…
Amir
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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 route becomes unreachable. Any idea how to achieve…
Henry-Nicolas Tourneur
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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 so This Must Not Happen Again. All the crucial…
Michael restore Monica Cellio
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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 a Master/slave mysql setup? This is what I have…
user204910
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Simple redundancy setup using two servers in two different datacenters?

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 and should therefore not be mentioned in an…
Yeti
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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 -- FastEthernet 0/1.1 -- vlan 11 -- 192.168.11.2 Gateway 2 --…
JCM
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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 clustered via VSS, active-active. When they perform an…
shank
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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 connection with the IP in the MX record goes down,…
Mark
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Configure a backup Win 2008 R2 Server

Scenario is a small network with a Server 2008 R2 running AD, DHCP, DNS, Print & File Sharing. We'd like to build a backup server to continue operations uninterrupted should the main server go down. Configuring DHCP, DNS and AD is easy. The question…
Dom
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Mirroring an entire machine

What's the most appropriate way to constantly mirror all the settings and data from one Linux machine to another? I have a critical server, which I'd like to have a "hot spare" available for in case any component failure takes it offline. I have…
Cerin
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Disk Redundancy across different server

I have 3 servers, all with the same specs: Intel CPU 8 GB RAM Linux or BSD Single 2TB desktop SATA with more than 10K Hours of operation, with only less than 300 GB Used My provider cannot install a second hard drive, but can guarantee me that the…
Mascarpone
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SSD redundancy via HDD

Is there a way to guarantee redundancy to an SSD using an HDD? Raid 1 is the best choice to guarantee redundancy in HDDs, but SSDs are too expensive to guarantee redundancy via RAID. If I was to couple an SSD with an HDD, could I guarantee…
Mascarpone
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Redundancy for WordPress sites

For static websites I'm using HAProxy (one master, several nodes with static HTML files on them). What services in addition would you recommend to allow WordPress sites to be hosted in the same way in terms of MySQL and files across the nodes…
David Maitland
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Redundant NFS Setup?

Is it possible to create a fault tolerant, redundant NFS server (e.g. master/slave)? Several of my web servers mount their WEBroot directories from a single NFS server (which is regularly backed up). Just trying to remove any SPOFs.
Trent Scott
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Mac Server (Snow Leopard) NIC Redundancy on Separate Switches

I have a Mac Snow Leopard Server with 2 NIC's. Each NIC is plugged into a separate physical switch. Currently each NIC has it's own IP, but I would like to setup redundancy so that they communicate with one combined IP. I am unsure how to do this…
Cathi
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