Why this article
The more I have to interact with customers asking about
MySQL/Galera, the most I have to answer over and over to the same
question about what kind of network conditions Galera can manage
One of the most frequent myths I have to cover at the start of
any conversation that involve the network is PING.
Most of the customers use PING to validate the generic network
conditions, and as direct consequence they apply that approach
also when in need to have information on more complex and heavy
use like in the Galera replication.
To have a better understanding why I consider the use of PING,
not wrong but inefficient, let us review some basic networking
At the beginning stay the physical layer, but I am going to skip
it otherwise article will be too long, what I want only to say is
that unless you are able to afford a leased line to …[Read more]