mount 硬盘镜像的一般问题。

1. 要搞清楚文件是 是由整个分区来的，还是整个硬盘来的

 

也就是说，是 dd if=/dev/sda1 还是 dd if=/dev/sda

 

[root@oraclevmserver43 test_pvm_centos5.4_route]# file System.img

System.img: x86 boot sector; partition 1: ID=0x83, active, starthead 1, startsector 63, 208782 sectors; partition 2: ID=0x8e, starthead 0, startsector 208845, 16563015 sectors, code offset 0x48

 

[root@oraclevmserver43 test_pvm_centos5.4_route]# fdisk -l -u System.img
last_lba(): I don't know how to handle files with mode 81a4
You must set cylinders.
You can do this from the extra functions menu.

Disk System.img: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders, total 0 sectors
Units = sectors of 1 * 512 = 512 bytes

     Device Boot      Start         End      Blocks   Id  System
System.img1   *          63      208844      104391   83  Linux
System.img2          208845    16771859     8281507+  8e  Linux LVM
Partition 2 has different physical/logical endings:
     phys=(1023, 254, 63) logical=(1043, 254, 63)

 

2. 计算出 offset = 63*512

 

3. mount 非 lvm分区 mount -o loop,offset=32256 System.img /mnt/sda1

 

4. mount lvm 分区：

 

losetup -o 16515072 -f System.img

 

5. 激活它：

 

vgchange -a y
  2 logical volume(s) in volume group "VolGroup00" now active

 

6. 查看;

 

ls /dev/mapper/

 

7. 如何反激活？