GitHub user weizhouapache added a comment to the discussion: DB connection is 
interrupted with multiple management servers


> > I tested mariadb for pr #9941 on rocky8/9, it worked fine. However the pr 
> > is targeted to 4.19 so it does not use hikaricp, I will test with 
> > 4.20-snapshot.
> > Based on your suspicion, can you change some settings in db.properties to 
> > dbcp2, then restart management server ?
> > db.cloud.connectionPoolLib db.cloud_usage.connectionPoolLib 
> > db.simulator.connectionPoolLib
> > Refer to 
> > https://docs.cloudstack.apache.org/en/4.20.0.0/adminguide/tuning.html#selecting-database-connection-pool-library
> 
> Hi @weizhouapache , thanks for your contribution.
> 
> Perfect, I will test the configuration with dbcp2, I will get back to you 
> with the result soon

I run smoke tests with two OL8 management server, two OL8 hosts and mariadb 
server 11.7  (not mariadb galera cluster).

```
[root@pr10006-t12509-kvm-ol8-mgmt1 ~]# mysql -uroot -p cloud
mysql: Deprecated program name. It will be removed in a future release, use 
'/usr/bin/mariadb' instead
Enter password: 
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 4374
Server version: 11.7.2-MariaDB-log MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [cloud]> 
```


it uses default hikaricp library. The test results look good
https://github.com/apache/cloudstack/pull/10006#issuecomment-2691067265

GitHub link: 
https://github.com/apache/cloudstack/discussions/10471#discussioncomment-12354011

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