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My question was to determine if there is an precise definition of how much availability constitutes High Availability There is no official definition of how much availability constitues "high availability". Thus, there are several more or less established definitions around the world. I don't want to be more precise as I don't really know if there is ...


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Highly Available means (in just few words) you have some redundancy to continue you service operative in the event of a failure of some component. The formula you wrote is to calculate the % of availability of a service. Most providers sign a SLA with clients, in order to penalize billing if this SLA is not accomplished.


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There is an article on wikipedia that describes high availability term. It is considered as one characteristic of a system. Also, you can find there already calculated percentages. For example, availability percentage of five nines (99.999%) means max down time of 5.26 minutes per year.


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I found the issue. It was a very elusive typo in /etc/zabbix/web/zabbix.conf.php I got one character wrong in server name!


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The V7000 will upgrade and reboot the nodes one at a time with a 30 minute pause enforced between one half of the nodes in the cluster and their respective partners. This means that your host will see half of the paths dissapear from the fabric and return, then a after half an hour, the other paths will do the same. As long as your DM Multipathing ...


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Answering my own question, as I finally figured it out. I added this to applicationHost.config under configuration/system.applicationHost: <webLimits connectionTimeout="00:10:00" minBytesPerSecond="0" /> But even after saving and pressing Restart under Manage Server in IIS Manager, it still responded with 502 after two minutes. However, today when ...


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You have two possible approach : 1. A single VIP for both farms : In this case, your VIP will be your NGinx server single ip address. http { upstream web.example.com { least_conn; server mywebserver1.loc; server mywebserver2.loc; server mywebserver3.loc; } upstream api.example.com { least_conn; server myapiserver1.loc; ...


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You don't mention, but I assume that you are after a multi-master setup. This rules out master-slave database setups. I believe which technology to use for security will be the least of your worries. 1. Datababase Keeping a multi-master database setup is sync is tricky. You can go with multi-master (active/active) database setups like MariaDB w/Galera ...


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You don't need paid TLS certificates for your own private communication. You can set up your own CA (with very long lasting certs, in case of compromise you just throw away the entire CA) and make your servers trust it, then you can issue as many certs as you want for different services. Paid certificates are only needed when you can't reliably make the ...


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rsync is a great tool for keeping files in sync. I would use it in combination with SSH (and public keys), like this: rsync -az -e ssh --delete /var/www otherserver:/var/www For multiple servers multiple uses of rsync might be the best option. Another option is pdcp -r, but that requires copying all the files every time instead of doing delta-transfers. ...


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Each error message translates disparate meaning here For MySQL server has gone away Mostly happens because the server timed out and connection is closed. Increase max_allowed_packet in my.cnf to a larger value, restart MySQL and check [mysqld] max_allowed_packet = 32M For Deadlock Mostly happens because multiple transactions together hold and ...



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