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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32 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 ...
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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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56 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....
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How to configure a fail safe ceph Journal?

I am assuming a redundant 2x 10GbE network with a realistic 2GB/s network bandwidth for this question (details here Ceph sizing for 2x 10GbE network with SSDs?) Means if we can achieve that a bunch ...
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39 views

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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Dual Raid Controller on Linux Server

I want to add hardware raid controller fault tolerance to my 8 HDD setup with a second hardware raid controller. Right now I have one MegaRAID SAS 9361-8i card and I'm ready to buy more. Is there a ...
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1answer
115 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 ...
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38 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 ...
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194 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/...
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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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548 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 ...
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1answer
370 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 ...
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606 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 ...
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1answer
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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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23 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 ...
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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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275 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 ...
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2answers
113 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 ...
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1answer
179 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 [::...
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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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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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445 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)$ { ...
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1answer
135 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 ...
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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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2answers
51 views

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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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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1answer
100 views

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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2answers
1k 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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1answer
216 views

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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4answers
265 views

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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2answers
221 views

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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1answer
92 views

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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3answers
387 views

Increase reliability by partitioning disks of different size?

I understand ZFS would prefer all disks carrying the same size. However, in the case that I have two disks with different size (1TB and 1.5TB), I'd like to have certain redundancy, but not mirroring. ...
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3answers
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Is it possible to have multiple storage servers in a failover cluster?

I'm familiar with setting up RAID arrays and am running a few in my home environment. I was wondering if it's possible to have multiple storage servers in a failover configuration. What I hope to ...
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5answers
221 views

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 ...
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1answer
219 views

Best approach for redundant storage DAS/SAN

We've always used DAS storage (which as per Dell standards) have multiple controllers for redundancy, multiple PSUs etc. However, in the event of full hardware failure (which may or may not be likely) ...
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1answer
672 views

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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1answer
302 views

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, ...
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0answers
202 views

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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1answer
75 views

Backup DNS servers for a domain name - optimal configuration and troublehooting

Let's say we have these name servers for 1 domain. ns.1.com ns.2.com ns.3.com ns.4.com backup-ns.1.com backup-ns.2.com How can I know which NS responded to this specific query, for example using dig?...
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Is it possible to have a secondary managed DNS provider to quickly delegate to when DDOS attack on our *primary* external DNS provider happens?

So our DNS provider, every so often, experiences DDOS attacks on their systems that causes our front-facing web sites to go down. What are some options in terms of reducing dependency on a SINGLE ...
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2answers
107 views

Fallback between datacenters

What is the best way to do a fallback between datacenters. We have a dedicated server in one of the data centers and as our traffic increased i wanted to add more then backup i wanted redundancy and ...
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1answer
114 views

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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2answers
2k views

VM migration and IP address

When a VM offering a service is migrated to a different server is it an important requirement from the client applications point of view to retain the same IP the VM had before ? For long lived TCP ...
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1answer
673 views

How to setup redundant ejabberd servers?

I currently have an ejabberd server running at domain A. It has a bunch of users with accounts like xyz@A. I want to setup alternative servers so that if A is down, clients can transparently use ...

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