Qmail authentication error: Input/output error

[MRatWork]

The reason using myisam instead innodb is less memory usage.

[fossxplorer]

Ok, i understand.
Why do i see vpopmail queries in DB in sleep mode?

MariaDB [(none)]> show processlist;
+-----+----------+-----------+----------+---------+------+-------+------------------+----------+
| Id  | User     | Host      | db       | Command | Time | State | Info             | Progress |
+-----+----------+-----------+----------+---------+------+-------+------------------+----------+
|  45 | root     | localhost | NULL     | Sleep   |    0 |       | NULL             |    0.000 |
| 138 | vpopmail | localhost | vpopmail | Sleep   |  243 |       | NULL             |    0.000 |
| 178 | vpopmail | localhost | vpopmail | Sleep   |  467 |       | NULL             |    0.000 |
| 213 | vpopmail | localhost | vpopmail | Sleep   |  247 |       | NULL             |    0.000 |
| 215 | vpopmail | localhost | vpopmail | Sleep   |  241 |       | NULL             |    0.000 |
| 221 | vpopmail | localhost | vpopmail | Sleep   |  242 |       | NULL             |    0.000 |
| 227 | vpopmail | localhost | vpopmail | Sleep   |  242 |       | NULL             |    0.000 |
| 254 | root     | localhost | NULL     | Query   |    0 | init  | show processlist |    0.000 |
+-----+----------+-----------+----------+---------+------+-------+------------------+----------+
8 rows in set (0.00 sec)

MariaDB [(none)]>

[MRatWork]

MariaDB is as the same as MySQL except certain features, like aria dan tokudb storage-engine. Think MariaDB as Kloxo-MR compare to Kloxo official.