how to mount vdi

First install lvm2, ndb and qemu-common packages:

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yum install lvm2 nbd qemu-common

Then run this to load the nbd module:

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modprobe nbd max_part=16

And connect the device:

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qemu-nbd -c /dev/nbd0 "/home/USER/VirtualBox VMs/CentOS6/CentOS6.vdi"

Load the dm-mod module:

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modprobe dm-mod

Run this command to scan for volume groups:

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vgscan

This will output something like this:

  Reading all physical volumes.  This may take a while...
  Found volume group "vg_centos" using metadata type lvm2

In the next step we want to use what is in the quotes above. Run this command but replace vg_centos with whatever shows in the quotes.

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vgchange -ay vg_centos

Then show which partitions there are:

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lvs

This will output something like this:

  LV      VG        Attr   LSize  Origin Snap%  Move Log Copy%  Convert
  lv_root vg_centos -wi-a- 18.12g
  lv_swap vg_centos -wi-a-  1.97g


In this case we want the logical volume named lv_root so run this command:

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mount /dev/vg_centos/lv_root /mnt/vdi -o ro,user

Now you should be able to find your disk in the /mnt/vdi folder. Note that you must have created the /mnt/vdi folder first but you can mount it wherever you like into an empty folder.

Some more useful tips.

You can unmount the disk:

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umount /mnt/vdi

This command will disconnect the nbd:

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qemu-nbd -d /dev/nbd0

After you disconnect the nbd you can unload the module:

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rmmod nbd   




Source: http://ryanrhode.com/news/view/ryans-blog/how-to-mount-a.htm