-bash-4.2# systemctl status mariadb -l

● mariadb.service - MariaDB 10.3.27 database server

   Loaded: loaded (/usr/lib/systemd/system/mariadb.service; disabled; vendor preset: disabled)

  Drop-In: /etc/systemd/system/mariadb.service.d

           └─mariadb-alt.conf, migrated-from-my.cnf-settings.conf

   Active: failed (Result: exit-code) since Fri 2021-10-22 18:08:17 UTC; 3s ago

     Docs: man:mysqld(8)

           https://mariadb.com/kb/en/library/systemd/

  Process: 3891 ExecStart=/usr/sbin/mysqld $MYSQLD_OPTS $_WSREP_NEW_CLUSTER $_WSREP_START_POSITION (code=exited, status=1/FAILURE)

  Process: 3695 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= ||   VAR=`cd /usr/bin/..; /usr/bin/galera_recovery`; [ $? -eq 0 ]   && systemctl set-environment _WSREP_START_POSITION=$VAR || exit 1 (code=exited, status=0/SUCCESS)

  Process: 3692 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)

 Main PID: 3891 (code=exited, status=1/FAILURE)

   Status: "MariaDB server is down"

Oct 22 18:08:16 btc-mdb-01 systemd[1]: Starting MariaDB 10.3.27 database server...

Oct 22 18:08:17 btc-mdb-01 mysqld[3891]: 2021-10-22 18:08:17 0 [Note] /usr/sbin/mysqld (mysqld 10.3.27-MariaDB-log) starting as process 3891 ...

Oct 22 18:08:17 btc-mdb-01 mysqld[3891]: 2021-10-22 18:08:17 0 [Warning] Can't create test file /data/mdb_data/btc-mdb-01.lower-test

Oct 22 18:08:17 btc-mdb-01 mysqld[3891]: [90B blob data]

Oct 22 18:08:17 btc-mdb-01 mysqld[3891]: 2021-10-22 18:08:17 0 [ERROR] Aborting

Oct 22 18:08:17 btc-mdb-01 systemd[1]: mariadb.service: main process exited, code=exited, status=1/FAILURE

Oct 22 18:08:17 btc-mdb-01 systemd[1]: Failed to start MariaDB 10.3.27 database server.

Oct 22 18:08:17 btc-mdb-01 systemd[1]: Unit mariadb.service entered failed state.

Oct 22 18:08:17 btc-mdb-01 systemd[1]: mariadb.service failed.

-bash-4.2#