How to make a ram disk
How to make a ram disk
version 1.1, 23 Feb 2001
If your root file system is on a device for which your kernel has no
compiled-in driver, you will need to use lilo to load
that driver as a module very early in the boot cycle.
There are only two steps:
make a ram disk image with mkinitrd
modify lilo.conf to point to the image
First, I cd over to /boot:
System.map
module-info-2.2.16-3ext3
System.map-2.2.16-3
initrd-2.2.16-3.img
vmlinux-2.2.16-3
System.map-2.2.16-3ext3
vmlinux-2.2.16-3ext3
vmlinuz-2.2.16-3
module-info
vmlinuz-2.2.16-3ext3
module-info-2.2.16-3
Here you can see that I have a 2.2.16-3 kernel and I have added a
second kernel with ext3 support
(vmlinuz-2.2.16-3ext3). There is already a ram disk image
for my first kernel (initrd-2.2.16-3.img)
To make a new image for the second kernel, I type the following (stuff
I type is in bold):
/boot# mkinitrd initrd-2.2.16-3ext3.img 2.2.16-3ext3
mkinitrd is a shellscript that looks at the modules needed by my
kernel, then makes an ext2 filesystem containing them.
If we look inside the image we see this is the case:
/boot# cat initrd-2.2.16-3ext3.img | gunzip > /tmp/myimage
/boot# file /tmp/myimage
/tmp/myimage: Linux/i386 ext2 filesystem
You do not have to look inside your image. Only making the image and
modifying lilo.conf are necessary steps. However, discussion of the
ramdisk image is provided for pedagogic purposes.
In order to look inside, I need to mount the image as though it
were a filesystem:
/boot# mount /tmp/myimage /mnt/tmp -t ext2 -o loop=/dev/loop3
/boot# ls /mnt/tmp
/boot# find /mnt/tmp
/mnt/tmp/lib
/mnt/tmp/lib/aic7xxx.o
/mnt/tmp/bin
/mnt/tmp/bin/sh
/mnt/tmp/bin/insmod
/mnt/tmp/etc
/mnt/tmp/dev
/mnt/tmp/dev/console
/mnt/tmp/dev/null
/mnt/tmp/dev/ram
/mnt/tmp/dev/systty
/mnt/tmp/dev/tty1
/mnt/tmp/dev/tty2
/mnt/tmp/dev/tty3
/mnt/tmp/dev/tty4
/mnt/tmp/linuxrc
The most important part of this ram disk image is
aic7xxx.o, which is my scsi module.
Finally, I move on to the last step, modifying
/etc/lilo.conf:
Here is my entry in lilo.conf that
corresponds to the kernel and image I just created:
image=/boot/vmlinuz-2.2.16-3ext3
label=linux.ext3
initrd=/boot/initrd-2.2.16-3ext3.img
root=/dev/hdb3
That's it. Run lilo as root and reboot.
If you have problems, check out the kernel HOWTO. There are a couple things you need to have
covered: you need your kernel modules compiled and living in
/lib/modules and you need to have an entry for each
module in /etc/conf.modules.
Making a generic ram disk
Make sure ram disk support is compiled in your kernel. If you
don't have it, see the miniroot
HOWTO for mounting via loopback.
Create a ramdisk device if one does not already exist in /dev:
/home/tony# mknod -m 660 /dev/ram b 1 1
/home/tony# chown root.disk /dev/ram
Zero out the space you need on the ramdisk device:
/home/tony# dd if=/dev/zero of=/dev/ram bs=1k count=4k
4096+0 records in
4096+0 records out
Make a file system on the ram disk, specifying the size:
/home/tony# /sbin/mkfs -t ext2 -m 0 /dev/ram 4096
mke2fs 1.18, 11-Nov-1999 for EXT2 FS 0.5b, 95/08/09
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
1024 inodes, 4096 blocks
204 blocks (4.98%) reserved for the super user
First data block=1
1 block group
8192 blocks per group, 8192 fragments per group
1024 inodes per group
Writing inode tables: done
Writing superblocks and filesystem accounting information: done
Mount the ram disk as you would a regular device:
/home/tony# mount -t ext2 /dev/ram /mnt/disk在GHOST11中Partition From Lmage是什么意思_百度知道
在GHOST11中Partition From Lmage是什么意思
选择之后浏览到你之前的镜像文件扩展名为.GHO，大概是这个意思，Partition From Image整句话的意思就是从镜像中加载分区文件不是Lmage 是Image也就是镜像的意思，这个选项是在系统恢复时使用的
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其他3条回答
partition 就是分区的意思.image就是镜像的意思.partition from image 整体意思就是使用ghost镜像还原分区,区别与disk from image
鄙人觉的大概是
Lmage 从分区
恢复系统时用到的命令，意思是恢复分区时要选择（或者是来自）哪个镜像文件。如果有多个镜像文件，可以在下一步进行选择。
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