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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Redundant Power Supply Sloshing (If sloshing is the right word)
I have a Supermicro Redundant Power Supply with two units in it. I also have two UPS units, one for each of the Power Supplys. I was watching the LCD on the UPSs for the watt usage. The total watts ...
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"Hot data" and erasure coding: how to know if it is efficiently handled?
It is well known that erasure coding adds extra complexity because of encoding and decoding operations. Due to this drawback, most of cloud services recommend to use data replication for hot data and ...
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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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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 ...
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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 (...
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AWS Multi Zone Redundancy - Load Balancer vs Global Accelerator vs Elastic IP what to use?
I am a bit confused with the Options for load balancing between different AZs for redundancy. I have an application which requires network load balancing and should optimally not depend on DNS to do ...
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Using (dual) ATS for dual PSU server?
There's two parts to my question:
Does it make sense to hook up a dual PSU server to an ATS to speed up failover to the secondary circuit?
If yes, does it make sense to use two separate ATSes to ...
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"Dezentral" job management with redundancy/load balancing
I search a job management solution for local processes. Usually they run for some weeks.
At the moment I use a jenkins, but there the server is not restartable (security updates) and there is no ...
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Postfix: Using sender dependent transport maps for redundancy and load balancing
I have a Postfix server and I'm trying to use two different IPs in two different connections / ISPs to send email.
The address 89.xxx.xxx.2 is the default system gateway at eth0 AND 188.xxx.xxx.2 is ...
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Newbie to Supermicro redundant PSU
Until recently I have never had a redundant PSU or a rack server for that matter. So, I think maybe I did this wrong? I have a Supermicro FatTwin 6026TT-HDTRF (CSE-827HD-R1400B case) that comes with a ...
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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 ...
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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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Redundant serving of web application without loadbalancer?
I want to run a web application inside a mobile app using WebView. The web application uses IndexedDB for saving various important values. I like to make the web application very available (redundant)....
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FreeBSD ZFS raidz1 Started a (da59) drive replacement. During resilver, second drive (da60) failed
Our system started slowing down... Found a couple of drives in the same raid that looked scary.
Replaced the drive that S.M.A.R.T. marked as failure eminent. (da59)
Then da60 started to error.
Finally ...
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Finding network topology issues
I am trying to check a network with redundant links for possible issues with switching (STP?) and/or routing. I have a feeling that the issues are intermittent but I'm struggling to find a method how ...
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How to set-up a secondary/redundancy LTE internet connection?
We're a small-medium office in Vancouver Canada, and we're looking to set-up a secondary/redundancy LTE internet connection. We're looking at purchasing the Unifi Dream Machine Pro to solve this issue,...
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Single isp dual failover links
I'm having a problem trying to configure my cisco 3945 router to use a dual hand-off wan links.
Lets say the ISP has provided the below ip addresses where they are doing hsrp at their end
ISP EDGE 1 ...
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Auto rebooting down servers
Currently have a web server VPS in Germany with Hetzner. They are offering free load balancer service. Thinking about cloning my VPS in their Finland site (meaning adding another VPS with cloned setup/...
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Redundancy for a device with 2 NICs on same subnet reaching other networks
I have a Linux based device with two NICs:
NIC1 eth0: 192.168.1.100/24; Gateway: 192.168.1.1
NIC2 eth1: 192.168.1.101/24; Gateway not set
This device communicates with an Application Server (IP: 10....
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How to disable redundant path warning for a d2600 with 12 HP SATA drives?
Have a HP p822 RAID controller with FirmWare 8.32 cabled to a HPE d2600 with 12 x 4TB SATA drives in RAID60. These are not dual-port SAS drives, but 4TB SATA drives so there is only one pathway to ...
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Failover Nginx reverse proxy
I am looking to setup my Nginx reverse proxy to handle a server failure or Nginx failing for some reason or another. I know how to configure nginx to work as a load balancer/ reverse proxy for other ...
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Implementing an automated mail backup/forwarding service?
I have a senario in mind but I'm not sure how it should be implemented:
I have a mail service with an mx record and an IP address. This mail server could be down sometimes. The incoming mails to this ...
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How to have multiple routes to the same remote VPN in pfSense?
We have a pfSense server in two offices. Our main office has a VPN server configured, and our satellite office has a VPN client configured, using the IP 123.156.88.253 (just an example).
We have just ...
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ESXI NIC Teaming Policy x 2 physical swith x Shaper\BGP router
I have a BPG/Shaper with 2 interfaces configured in Bond0 (Loadbalance-RoundRobin)then connect one to each switch (one in Red one in Blue).
ESXI is the same thing, 2 interfaces in one vSwitch NIC ...
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How do region based services with a single backing database work to improve redundancy or load balancing?
I've used services where there are multiple application servers spread out throughout US, at least I have to assume because I could explicitly use urls like EastUS.email.Com or WestUS.email.Com or ...
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Connect switches using SFP connectors or uplink
In our environment we have 2 server rooms. One is our primary server room where internet is comming in and where our main servers are located.
Then we have a secundary server room where our backup ...
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OpenStack Redundant Ceph/Cinder Storage Architecture
Hello Serverfault community,
I'm currently designing an OpenStack cluster. The part where I'm currently stuck is the Storage Architecture.
I thought of building two redundant Ceph clusters in ...
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Best Reliability for Linux OS: FakeRAID, SoftRAID, or No RAID
I'm tasked with building a highly-reliable, unmanned industrial PC that will withstand unplanned power outages. A UPS will be used where possible, but realistically we know that many of these units ...
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Is it feasible to switch DNS A records to point to a backup provider in case of failure?
Is it feasible to switch DNS A records to point to a backup provider in case of failure?
Instead of relying on one provider/datacenter.
I know there is a lag due to ISPs caching the records, but it'...
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Speed up EIP reassignment
I have a real-time application running on an Amazon EC2 instance. I'd like to implement master/slave redundancy with a VPC, a second instance and keepalived.
So far it's working reliably, but in the ...
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several domain controller logon
I've got two domain controllers. The master is DC01 and slave Fil01. I got that problem, that some computers logon over the slave dc and not the master. How can I set the order or prevent them on ...
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Layer 3 switch redundancy solution (with vlan's, stp)
So basicly I have a setup which I want to get to work but i'm unable to.
It's possible I am overseeing a lot of things but let's get to it anyways.
The current situation is a network with 4 switches ...
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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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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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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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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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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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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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High Available service - IP/DNS single point of failure
I'm looking for High Available solution for websites and already find
Kubernates , Docker Swarm ... but all these things should balance only webserver , db and other running service in the cluster. ...
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Need some clarification on a NIC functionality on a Dell Poweredge r610
Quick question. I'm trying to understand the NIC functionality of this server. NIC specs from manual:
My question is, do the two broadcom controller chips provide fail-over redundancy? For example, ...
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