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What's the the /dev/mapper/VolGroup-lv_home, /dev/VolGroup/lv_home, and the /home?

and what's the difference between them?

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The /dev entries are (links to) the block device itself; the /home directory is the directory which serves as the mount point for this filesystem so that userspace (applications) can access the contents stored on the block device.

The two /dev entries happen to be symbolic links to the real "device manager" device, which is something like /dev/dm-2. The LVM system creates the symbolic links to that /dev/dm-2 so that it is easier to recognize what the device is. The links will look something like:

$ ls -l /dev/mapper/VolGroup-lv-home /dev/VolGroup/lv-home
lrwxrwxrwx 1 root root 7 Jan 18 12:39 /dev/mapper/VolGroup-lv-home -> ../dm-2
lrwxrwxrwx 1 root root 7 Jan 18 12:39 /dev/VolGroup/lv-home -> ../dm-2

Your output will probably be slightly different.

  • there have the /dev/VolGroup/lv-home why there still need the /dev/mapper/VolGroup-lv-home? – 244boy Jan 26 at 0:50
  • The device-mapper creates /dev/mapper/ entries and they should remain there. They're probably referred to in /etc/fstab and are created automatically. The /dev/VolGroup/ links are created for LVM volumes automatically to make life easier for people, and can also be used in fstab and other storage entries. – jsbillings Jan 26 at 12:59

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