mysql delegated dataset settings.pp

    # Enable LZ4 on the root delegated dataset, so incoming zfs send | recv
    # operations inherit it.
    zfs { $delegated_root: compression => 'lz4' }

    zfs { $mysql_dataset:
      atime        => 'off',      # disable atime (it probably is for the entire pool, but lets be sure!)
      compression  => 'lz4',     # http://don.blogs.smugmug.com/2008/10/13/zfs-mysqlinnodb-compression-update/
      primarycache => 'metadata', # ZFS ARC is just doubling the InnoDB buffer pool in memory, so leave it to do it's thing.
      devices      => 'off',
      exec         => 'off',
      logbias      => 'latency',
      mountpoint   => $mysql::server::config::mysql_data_root,
      recordsize   => "16K"     # https://blogs.oracle.com/realneel/entry/mysql_innodb_zfs_best_practices
    }

    zfs { $mysql_log_dataset:
      atime       => 'off',   # disable atime (it probably is for the entire pool, but lets be sure!)
      compression => 'lz4',  # http://don.blogs.smugmug.com/2008/10/13/zfs-mysqlinnodb-compression-update/
      devices     => 'off',
      exec        => 'off',
      logbias     => 'latency',
      recordsize  => "128K",   # https://blogs.oracle.com/realneel/entry/mysql_innodb_zfs_best_practices
      mountpoint => $mysql_log_root
    }