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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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hardware failover server configuration

need to achieve redundancy for offline local small business Document managing system server and need to know which configuration is better considering zero down time and automated switching in failure situation without losing any data and…
Sandra1998
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Redundant network connections (using switches without link aggregation support)

I need to connect two Windows 10 PCs together via Ethernet. They will be connected in series through two managed switches (Microchip KSZ9897). Each PC has two Intel NICs. I need the links to be redundant so that communication between the two PCs are…
Lunde
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Single disk partial redundancy

I have a single external HDD that I'd like to use as storage for data that's not read/written very often. I'd like to make this storage resilient against faults that might occur. ZFS apparently supports copies=2, where each bit of information is…
Mark
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How does zfs raidz-2 recover from 3 drives down?

Im wondering what happened, how ZFS was able to recover completely, or if my data is still truly in tact. When i came in last-night i saw this to my dismay, then confusion. zpool status pool: san state: DEGRADED status: One or more devices has…
Brian Thomas
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Redundant Server Application

I have two identical servers, they run linux and they have a data base and a piece of software that is constantly recieving inputs. What is the right term that I should search for to be able to configure one as a redundant server - I mean when one…
user514519
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Network bonding active-backup mode with two switches

This below is a sample of my network. I have two interfaces on one machine eth0: 192.168.150.2 and eth1: 192.168.150.3 and I want make my network redundant using mode=1 which is active-backup, so if one switch fails I want to still have traffic to…
ananetworking
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Best approach to achieve high availability and disaster recovery?

We are deploying SQL servers at two geographically distant sites. The bandwidth between two sites is 10Mbps. The requirement is to have both sites writable/readable. Both sites have redundancy requirement within site and at the same time they sync…
MidTierDeveloper
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DNS hosting design - should secondary server not be spread over countries, networks etc?

My DNS registrar and DNS provider recently had a long outage, rendering all my domains unusable (email, own+client websites etc). They have 3 DNS server, who are all in the same co-hosting facility! I know just enough about networking to make my…
Kjensen
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Can't access ZFS formatted drives (redundant setup)

I keep my important data on 2 drives that are mirrored (I think that is the correct terminology) in a machine running Ubuntu 12.04 LTS. Today, I was unable to access any of the data and 'sudo zpool status -x' returns: pool: data state:…
Damon Sisk
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Methodology to find a "stable" IP addres within some ISP's AS network

Some definition(s)/meaning(s): Stable IP address - a host within Internet Service Provider (ISP) Autonomous system (AS) network, replaying to ICMP type 8 echo request. Genesis: My routers monitor Internet connectivity by requesting ICMP echo request…
Michal Sokolowski
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Server Network Redundancy and Availability

If I have one server with RAID 50 or 10, then data is distributed among hard drives in case one fails. Can the same be done across multiple servers. Can data be distributed among multiple servers, so that if one server fails, data would not be lost.…
SJ Johnson
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How to safely store data and DBs on Kubernetes (or similar) on DigitalOcean

It boils down to setting up a private cloud on something like Digital Oceans versus another hosting solution like GCE or AWS. The latter have redundant data stores that can be safely used as volumes, while the former provides a bigger per-instance…
Sarke
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Host using Linux bond mode 1 (active/backup) connected to 2 x independent switches

I have a host using Linux bond mode 1 (active/backup) connected to 2 x independent switches. Please can someone confirm if this is possible for successful failover between NICS or do I have to interconnect the two switches? If this is already…
adamjth
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RAID5 and persistent write-intent bitmaps

I have a Ubuntu 8.10 software RAID5 setup that uses 4 active disks and 1 spare. The spare disk has three partitions, one of which is devoted to the spare function. I am using a second partition on the spare disk to be a home to the write-intent…
Robert Rolnik
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Setting up a small network with a redundant WAN setup

Asked on the network stack but referred here, partly because lower grade equipment. Small office and we are trying to piece together a network with our two wans (diff ISPs) a switch and a few routers, the goal is to have redundant connectivity.…
TrustNoOne
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