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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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 ...
Jon Bivin's user avatar
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SSD Configuration choices for a 2-Way-Mirror Software RAID

I want data redundancy for my SSDs, and so would likely be using a software RAID like Windows Storage Spaces in a simple, fully-provisioned 2-way mirror configuration. To minimize the risk of both ...
Fit Nerd's user avatar
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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 ...
VolkA's user avatar
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How to configure samba+winbind with AD redundancy?

I work for a company that offers a software solution for network management. Part of the solution is proxy authentication. An already legacy option in our software, is to configure a proxy to use NTLM ...
EdgarLemke's user avatar
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How to set up Parallel Redundancy Protocol on linux?

I'm trying to setup a PRP connection between to Linux machines (Ubuntu 20-04 LTS) following the doc from TI. The module hsr is present (modprobe hsr works), but when I tried to use iproute2, it seems ...
grep's user avatar
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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 ...
Tom L.'s user avatar
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How do I (automatically) re-attempt to deliver mail from a different Postfix server?

My network consists of two different locations and in both I have a Postfix server running for outgoing mail on each of them. Mail gets submitted to any of the two round-robin, based on having them ...
gertvdijk's user avatar
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Load balance the Load balancer

I am looking to get load balancing for my load balancer. We are looking to create a fully HA network. All of our servers are redundant, the databases are redundant, but above them is a single server ...
bulgarian-beast's user avatar
2 votes
2 answers
234 views

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 ...
Sandra1998's user avatar
4 votes
1 answer
450 views

How can i get a virtual machine in Hyper-V to carry on running in failover cluster. 2 Nodes, Server 2019

Forgive me if I am missing something obvious but I am very new to servers and failover clustering. I haven't found a question that quite answers what I am looking for yet. My goal is to make a VM run ...
Meredith's user avatar
5 votes
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How should the EFI System partition be made redundant without using hardware RAID?

What is BCP for making the EFI System partition redundant without using hardware RAID? If I create 3x EFI System partitions on different devices and then backup any changes made to the primary (...
Neil Stockbridge's user avatar
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Pacemaker/Corosync: how to emergency-shutdown all resources (VMs qemu/kvm)

Good morning everyone - Running a 6 node Pacemaker/Corosync cluster with lots of productive qemu/kvm VMs on it, we were wondering how to best do an "emergency shutdown" of the whole lot, ie. ...
Christian's user avatar
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Redundancy of Raid 10 with a hot spare?

Raid 10 has a 2N redundancy. What is the redundancy for Raid 10 with a hot spare? Am I correct in thinking it is 2N+1 redundancy?
Vincent's user avatar
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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 ...
Lunde's user avatar
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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 ...
elleciel's user avatar
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VLAN - Network Redundancy With Same 2nd Switch?

Is it possible to set up the same VLANs on two different switches with same IPs, but different MACs on dual port network cards of servers? In case switch 1 is down or needs maintenance I would like ...
lion's user avatar
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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 ...
Alai's user avatar
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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,...
Vivin Oommen's user avatar
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Mirror Linux Systems Running Game Servers And Payment Managing servers

I am building a sort of professional hosting service and want to be able to just switch machines if something goes down on one I use AMP which is a web server along with a game hosting server platform ...
Jack Schumacher's user avatar
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stp - avoid links with packet loss

We have a set of devices connected in a ring, that are using stp (using https://github.com/mstpd/mstpd at the moment) to avoid issues with the loop. What we have seen, is that while stp can adapt the ...
eglasius's user avatar
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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 ...
Bhargav's user avatar
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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/...
cvlo's user avatar
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Best way to mirror a large drive onto two smaller ones

I have an 8.0 TB Drive which will soon start filling up with videos I have two spare 4.0 TB Drives The system is running Linux Mint 19 Tara and is my desktop system (Yes it's a big system able to ...
Jesse the Wind Wanderer's user avatar
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1 answer
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DNS and failure tolerance strategies for load balancers

I'm trying to educate myself about how to build a highly available load balancing service for application servers for e.g. HTTP traffic and how they work with DNS servers. Consider the following ...
Josh's user avatar
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597 views

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 ...
Mark's user avatar
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3 votes
1 answer
248 views

Redundant L2 Uplink (OS10)

I am trying to design a redundant uplink to a service provider from a pair of Dell S4112 switches running OS10. We a getting two uplink connections from the service provider, but they cannot be ...
DEHAAS's user avatar
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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 ...
TCB13's user avatar
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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 ...
Robert Wooden's user avatar
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1 answer
860 views

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....
kuma's user avatar
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How to be a redundant with VMs on this middle infrastructure?

I need to implement for an association three virtual machines to manage the domain and two other software that will use databases. Of course they don't have a big budget but I am trying with their ...
Maxim Haag's user avatar
2 votes
1 answer
2k views

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 ...
Brian Thomas's user avatar
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3 answers
456 views

Can the Kubernetes master be geographically seperate from the nodes?

If I were to setup a kubernetes cluster, would it be possible and viable to have the kubernetes master in datacenter A, while having the nodes in datacenter B? I know there can be issues with having ...
Hedam's user avatar
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676 views

Is there a way to add another redundant DNS along with CloudFlare?

My question stems from the recent incident with CloudFlare on July 2nd deploying bad software on their systems and causing downtime to most of their clients, including us. https://blog.cloudflare.com/...
Alex Protopopescu's user avatar
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1 answer
272 views

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 ...
rjt's user avatar
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1 vote
3 answers
284 views

Redundant Server Application [closed]

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 ...
user514519's user avatar
-1 votes
2 answers
502 views

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. ...
DobriL DobriLov's user avatar
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2k views

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 ...
Josh Kirby's user avatar
1 vote
1 answer
1k views

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 ...
ananetworking's user avatar
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2 answers
2k views

Two DHCP servers giving static addresses in a network

I have a network having two servers that are occasionally booted. I wish to maintain DHCP services even during a boot of one server. One of the servers currently has a DHCP server that gives static ...
juhist's user avatar
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1 answer
339 views

Does it make sense to connect a redundant power supply to a C14 splitter?

Recently visiting a small data room, I noticed that redundant power supplies of a server are connected through a C14 splitter which, in turn, is connected to a single socket of a UPS. I told the ...
Arseni Mourzenko's user avatar
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1 answer
48 views

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 ...
Saman Hamidi's user avatar
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1k views

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 ...
Danny Beckett's user avatar
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359 views

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 ...
Luiz Fernando Marques's user avatar
1 vote
2 answers
471 views

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 ...
MidTierDeveloper's user avatar
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1 answer
239 views

Is it logical and safe to add Nginx cache expiration directive to the default conf?

This is my Nginx default conf (sites-available/default), which I use as base conf for all apps: server { # listen, root, index, server_name, locations; listen 80 default_server; listen [::...
Arcticooling's user avatar
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4 answers
98 views

enabling Spanning-Tree or not

do you think is wise or stupid keeping the rapid spanning tree enabled for just two switches in this image? https://i.stack.imgur.com/GIG0i.jpg As you can see the switches are not redundant each ...
butterfly77's user avatar
9 votes
3 answers
8k views

Is Ceph possible to handle hardware RAID arrays (LUNs) as OSD drives?

I am pretty new to Ceph and try to find out if Ceph supports hardware level raid HBAs. Sadly could not find any information. What I found is, that it is recommended to use plain disks for OSD. But ...
cilap's user avatar
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2 votes
1 answer
641 views

Upstream Nginx location blocks into site confs

I have a few websites on a Ubuntu 16.04-Nginx server environment and the Nginx conf file of each includes this set of location blocks: location ~* \.(jpg|jpeg|png|gif|ico|css|js|ttf|woff|pdf)$ { ...
Arcticooling's user avatar
3 votes
1 answer
220 views

Which distributed filesystem will actually fit my needs?

Hear me out I have seen the question asked (in different forms) here, here, and perhaps the best one I found was here, but I do not think this is a duplicate because quite some time has past since ...
Michael's user avatar
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1 vote
2 answers
177 views

DNS hosting design - should secondary server not be spread over countries, networks etc? [duplicate]

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! ...
Kjensen's user avatar
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