Ramdisk 内存系统配置
1，kernel 配置，设置ramdisk 大小
[root@localhost ~]# cat /etc/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/vda6
# initrd /initrd-[generic-]version.img
#boot=/dev/vda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.32-358.el6.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.32-358.el6.x86_64 ro root=UUID=5f60bd8c-5991-4101-a1f4-a08f3ef88832 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet ramdisk_size=102400
initrd /initramfs-2.6.32-358.el6.x86_64.img
2， 格式化RAM 分区
mke2fs /dev/ram0
3， 创建挂载目录
mkdir /ramdisk
4，挂载ramdisk 目录
mount /dev/ram0 /ramdisk
5，验证ramdisk 文件系统
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/vda6 24G 601M 22G 3% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/vda1 504M 43M 436M 9% /boot
/dev/vda3 30G 3.2G 25G 12% /usr
/dev/vda2 50G 618M 47G 2% /var
/dev/vdb1 50G 690M 47G 2% /opt
/dev/ram0 97M 1.6M 91M 2% /ramdisk
[root@localhost ramdisk]# ls
lost+found
[root@localhost ramdisk]# dd if=/dev/zero of=./a.img count=88 bs=1M
88+0 records in
88+0 records out
92274688 bytes (92 MB) copied, 0.116734 s, 790 MB/s
[root@localhost ramdisk]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/vda6 24G 601M 22G 3% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/vda1 504M 43M 436M 9% /boot
/dev/vda3 30G 3.2G 25G 12% /usr
/dev/vda2 50G 618M 47G 2% /var
/dev/vdb1 50G 690M 47G 2% /opt
/dev/ram0 97M 90M 2.0M 98% /ramdisk
6,配置完成！
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