ramdisk 内存文件系统定制-视频播放

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！