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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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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 (...
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Redundant Power supplies do not show up in ipmitool

I work with a server with redundant power supplies, which work as intended. When I try to retrieve information about, which power supply currently has power using the following command I found: ...
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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. ...
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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?
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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 ...
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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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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 ...
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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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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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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 ...
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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 ...
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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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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 ...
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1 vote
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 ...
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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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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 ...
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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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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 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 ...
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2 votes
1 answer
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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 ...
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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 ...
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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/...
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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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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 ...
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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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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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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 ...
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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 ...
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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 ...
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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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0 votes
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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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1 vote
2 answers
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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 ...
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1 answer
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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 [::...
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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://imgur.com/a/XI1NI As you can see the switches are not redundant each other but are ...
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9 votes
3 answers
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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 ...
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2 votes
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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)$ { ...
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2 votes
1 answer
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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 ...
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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! ...
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2 answers
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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 ...
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6 votes
4 answers
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If a RAID controller fails, does it disrupt service until it's replaced?

If I have 2 drives in a RAID 1, and the Raid Controller fails, does that mean the websites on the server will have downtime until the controller is replaced? Or does everything still carry on as ...
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How many drives can fail in an Xserve RAID in RAID 0+1? [closed]

I’m torn between what I know (or think I do) and what Apple’s documentation states. The hypothetical setup I’m considering is what is described as RAID 0+1 in Apple’s documentation for the Xserve ...
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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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Is it possible to boot from a DAS device with read-only access?

Without boring you with the details, I'd like to run two servers from the same DAS. One server would be the primary server and would have read / write access to the DAS. The other server will be the ...
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2 votes
2 answers
2k views

How to manage redundant ISPs with dynamic DNS

I'm trying to make my small business network a bit more robust by adding a fallback ISP. What I can't figure out is how to manage the DNS for inbound connections. A simplified view of my network looks ...
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3 votes
1 answer
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Openstack redundant architecture on three servers

I would like to deploy an Openstack architecture on three (super)servers in a way that if one of server is down the Openstack infrastructure is still functionning. What is the best way to deploy ...
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9 votes
4 answers
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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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2 answers
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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 ...
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