[ClusterLabs] Why my node1 couldn't back to the clustering chain?

Antony Stone Antony.Stone at ha.open.source.it
Fri Apr 9 04:25:07 EDT 2021

On Friday 09 April 2021 at 08:58:39, Jason Long wrote:

> Thank you so much for your great answers.
> As the final questions:

Really :) ?

> 1- Which commands are useful to monitoring and managing my pacemaker
> cluster?

Some people prefer https://crmsh.github.io/documentation/ and some people 
prefer https://github.com/ClusterLabs/pcs

> 2- I don't know if this is a right question or not. Consider 100 PCs that
> each of them have an Intel Core 2 Duo Processor (2 cores) with 4GB of RAM.
> How can I merge these PCs together so that I have a system with 200 CPUs
> and 400GB of RAM?

The answer to that depends on what you want to do with them.

As a general-purpose computing resource, you can't.  The CPU on machine A has 
no (reasonable) access to the RAM on machine B, so no part of the system can 
actually work with 400GBytes RAM.

For specialist purposes (generally speaking, performing the same tasks on 
small pieces of data all at the same time and then putting the results 
together at the end), you can create a very different type of "cluster" than 
the ones we talk about here with corosync and pacemaker.


A common usage for such a setup is frame rendering of computer generated films; 
give each of your 100 PCs one frame to render, put all the frames together in 
the right order at the end, and you've created your film in just over 1% of the 
time it would have taken on one computer (of the same type).



Most people have more than the average number of legs.

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