MySQL启用SSD存储_MySQL
MySQL启用SSD存储
有时OS读写慢会降低MySQL服务器的性能,尤其是OS与MySQL使用同一磁盘时。故最好是让MySQL使用单独的磁盘,能使用SSD更好。要做到这一点,需要把SSD新磁盘挂载到服务器上,假定新磁盘在/dev/sdb。
1、准备新磁盘:
# fdisk /dev/sdb
按下“n”将创建一个新分区;按下“p”将创建新的主分区。接着设置分区号(从1~4),再选择分区的尺寸,按下回车键。
如果不想使用整个磁盘作为一个分区,那么还需要继续创建新分区。
按下“w”实现写改变。
2、在新分区创建文件系统
# mkfs.ext4 /dev/sdb1
3、把新分区映射到某个目录,我取名为“ssd”,在root根目录下。
# mkdir /ssd/ # mount /dev/sdb1 /ssd/
4、让此映射在服务器启动时就生效
修改配置文件/etc/fstab
/dev/sdb1 /ssd ext4 defaults 0 0
5、把MySQL移到新磁盘
先停止MySQL服务
# service mysqld stop
如果系统存在写MySQL的服务,也停止,比如
# service httpd stop # service nginx stop
复制整个MySQL目录到新磁盘
# cp /var/lib/mysql /ssd/ -Rp
复制完成后,重命名MySQL的目录
# mv /var/lib/mysql /var/lib/mysql-backup
接着创建符号链接
# ln -s /ssd/mysql /var/lib/mysql
现在可以启动MySQL服务了
# service mysqld start # service httpd start # service nginx start

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