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.
Questions tagged [redundancy]
300 questions
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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 IP addresses. It gives addresses only to users with…
juhist
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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 person who was showing me the data room that in my…
Arseni Mourzenko
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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 server will be lost in the duration of the down…
Saman Hamidi
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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 got a 2nd internet connection in our main office.…
Danny Beckett
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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 Teaming policy (Route based on the originating port…
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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 [::]:80 default_server;
root /var/www/html;
…
Arcticooling
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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://i.stack.imgur.com/GIG0i.jpg
As you can see the switches are not redundant each other but are connected simply because one has…
butterfly77
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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 Euro.email.com (as opposed to just email.com. I…
Sidney
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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 backup and will have read-only access to the…
Dan Truitt
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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 servers are located. In this room we also have a…
Mivaweb
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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) something like DAS replication would be the…
PnP
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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 different racks with a different fuse and UPS. So far so…
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8 answers
External Network Drive for Backup
My problem is that I have a server class machine with mission critical data sitting in a building and I have no data redundancy outside of the building. What's the cheapest solution to backup the data so that I don't lose everything if the building…
Daniel
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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 will be installed without UPS.
I initially set out…
EnemyBagJones
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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's at least something.
Is there a better way to…
Sarke
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