MariaDB on ZFS

ZFS parameters

<syntaxhighlight lang=bash> zfs set atime=off MYSQL-DATA zfs set compression=lz4 MYSQL-DATA

zfs set atime=off MYSQL-LOG zfs set compression=lz4 MYSQL-LOG

zfs set recordsize=8k MYSQL-DATA/data

zfs set recordsize=16k MYSQL-DATA/InnoDB zfs set primarycache=metadata MYSQL-DATA/InnoDB

zfs set primarycache=metadata MYSQL-LOG/ib_log </source>

<syntaxhighlight lang=bash>

1. zfs list -o recordsize,primarycache,compression,compressratio,atime,name -r MYSQL-DATA -r MYSQL-LOG

RECSIZE PRIMARYCACHE COMPRESS RATIO ATIME NAME

  128K           all       lz4  1.06x    off  MYSQL-DATA
   16K      metadata       lz4  2.81x    off  MYSQL-DATA/InnoDB
    8K           all       lz4  1.05x    off  MYSQL-DATA/data
  128K           all       lz4  2.15x    off  MYSQL-LOG
  128K           all       lz4  1.00x    off  MYSQL-LOG/binlog
  128K      metadata       lz4  2.17x    off  MYSQL-LOG/ib_log

</source>

If you have innodb_file_per_table=on

<syntaxhighlight lang=bash>

1. mysql -e 'show variables like "innodb_file_per_table";'

+-----------------------+-------+ | Variable_name | Value | +-----------------------+-------+ | innodb_file_per_table | ON | +-----------------------+-------+ </source>

• If you have only InnoDB-Tables or the only productive ones are InnoDB then consider setting the blocksize of MYSQL-DATA/data to 16k because all Innodb-Datafiles (*.ibd) will be written there :-\.*
• consider setting the initial innodb_data_file_path to smaller value like ibdata1:100M:autoextend

Database parameters for ZFS

<syntaxhighlight lang=mysql> datadir = /MYSQL-DATA/data/mysql innodb_data_home_dir = /MYSQL-DATA/InnoDB innodb_data_file_path = ibdata1:2000M:autoextend innodb_log_group_home_dir = /MYSQL-LOG/ib_log

1. innodb_flush_method = O_DIRECT

innodb_flush_log_at_trx_commit = 2 innodb_file_per_table = off skip-innodb_doublewrite </source>

<syntaxhighlight lang=bash>

1. /usr/sbin/mysqld --print-defaults

/usr/sbin/mysqld would have been started with the following arguments: --server_id=42 --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306 --basedir=/usr --datadir=/MYSQL-DATA/data/mysql --innodb_data_home_dir=/MYSQL-DATA/InnoDB --innodb_data_file_path=ibdata1:100M:autoextend --innodb_log_group_home_dir=/MYSQL-LOG/ib_log --innodb_flush_method=O_DIRECT --innodb_flush_log_at_trx_commit=2 --skip-innodb_doublewrite --tmpdir=/tmp </source>

On Linux do not forget to add new directories to apparmor!