修改atime，提高MySQL的读效率

mysql数据文件放置在/data目录

1、修改/etc/fstab

[root@pt218 /]# cat /etc/fstab

#

# /etc/fstab

# Created by anaconda on Fri May 17 16:05:37 2013

#

# Accessible filesystems, by reference, are maintained under '/dev/disk'

# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info

#

#UUID=5526c0f1-49ee-41f7-a450-dc31109e1006 /                       ext4    defaults        1 1

UUID=5526c0f1-49ee-41f7-a450-dc31109e1006 /                       ext4    noatime       1 1

UUID=50cd6d2d-7a59-4b25-bae9-af6d5b028021 /boot                   ext4    defaults        1 2

/dev/mapper/vg_data1-lv_var /var                    ext4    defaults        1 2

/dev/mapper/vg_data1-lv_swap swap                    swap    defaults        0 0

tmpfs                   /dev/shm                tmpfs   defaults        0 0

devpts                  /dev/pts                devpts  gid=5,mode=620  0 0

sysfs                   /sys                    sysfs   defaults        0 0

proc                    /proc                   proc    defaults        0 0

/dev/mapper/vg_data1-lv_app /app                    ext4    defaults        1 2

/dev/mapper/vg_data1-lv_home /home                    ext4    defaults        1 2

2、重新加载mount

mount -o remount /

3、检查是否成功修改

[root@pt218 /]# mount

/dev/mapper/ddf1_44656c6c202020201028001510281f033e632b06c3572061p2 on / type ext4 (rw,noatime)

proc on /proc type proc (rw)

sysfs on /sys type sysfs (rw)

devpts on /dev/pts type devpts (rw,gid=5,mode=620)

tmpfs on /dev/shm type tmpfs (rw)

/dev/mapper/ddf1_44656c6c202020201028001510281f033e632b06c3572061p1 on /boot type ext4 (rw)

/dev/mapper/vg_data1-lv_var on /var type ext4 (rw)

/dev/mapper/vg_data1-lv_app on /app type ext4 (rw)

/dev/mapper/vg_data1-lv_home on /home type ext4 (rw)

none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)

sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)