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Created attachment 1116586 [details]
Screenshot zip file

Description of problem:
I have install two RHEL7.2 on one server .The grub has already contain two RHEL7.2 OS (first install the rhel72-1 OS then install the rhel72-2 OS).But when trying to boot from the rhel72-1 OS it will failed to boot up.

Version-Release number of selected component (if applicable):
rhel-server-7.2-x86_64-dvd.iso

How reproducible:
Every time

Steps to Reproduce:
1.Use a bare machine to install the RHEL7.2 OS with below partation:
   sda1   500M xfs /boot
   sda2   7G   lvm   rhel-root xfs /
          2G   lvm   rhel-swap swap
2.then use the same machine to install the second RHEL7.2 OS as below partation:
   sda3   500M  xfs /boot
   sda4   1k
   sda5   7G  lvm rhel00-root xfs /
3.waiting for the installation finished
4.select first install RHEL7.2 OS to boot

Actual results:
boot failed

Expected results:
boot success

Additional info:
The solution is fix the grub list manual :
When see the grub high light the first RHEL7.2 OS then press "e" to edit it find the “root=/dev/dm-2”entry and then fix it  into "root=/dev/mapper/rhel-root" then press "Ctrl+x" the first RHEL7.2 OS could boot normal.

I just wondering why the default grub doesn't work.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2351.html