mariadbd would have been started with the following arguments:
--port=3306 --socket=/run/mysqld/mysqld.sock --thread_handling=pool-of-threads --default-storage-engine=Aria --sql_mode=NO_ENGINE_SUBSTITUTION --user=mysql --pid-file=/run/mysqld/mysqld.pid --basedir=/usr --datadir=/mnt/drbd/mysql/var/lib/mysql/ --tmpdir=/mnt/drbd/mysql/tmp --lc-messages-dir=/usr/share/mysql --bind-address=0.0.0.0 --userstat=1 --max_allowed_packet=512M --table_open_cache=2048 --tmp_table_size=128M --max_heap_table_size=128M --table_definition_cache=1000 --myisam_max_sort_file_size=64G --key_buffer_size=4G --myisam_sort_buffer_size=4G --aria_pagecache_buffer_size=2G --max_connections=2000 --concurrent_insert=ALWAYS --general_log_file=/var/log/mysql/mysql.log --general_log=0 --log_error=/var/log/mysql/error.log --slow_query_log=1 --slow_query_log_file=/var/log/mysql/mysql-slow.log --long_query_time=2 --min_examined_row_limit=0 --log-queries-not-using-indexes --max_binlog_size=100M --character-set-server=utf8mb4 --collation-server=utf8mb4_general_ci