Description of problem:
RHEL6.0-20100729.1 installation fails on host.

Version-Release number of selected component (if applicable):
RHEL6.0-20100729.1

How reproducible:
5/5

Steps to Reproduce:
1.Download files 'initdr.img' and 'vmlinuz'to local host '/boot'. 
(URL:"http://download.englab.nay.redhat.com/pub/rhel/rel-eng/RHEL6.0-20100729.1/6.0/Server/x86_64/os/images/pxeboot/")

2.Add this lines to file'/boot/grub/grub.conf':
 title Install 
        root (hd0,0)
        kernel /boot/vmlinuz
        initrd /boot/initrd.img

3.Restart host OS and select 'Install' menu item.

4.Click 'ok' untill installation method page ,then select 'url' and click 'ok'

5.Disable IPV6 support and click 'ok'.

6.At the url setup page input url "http://download.englab.nay.redhat.com/pub/rhel/rel-eng/RHEL6.0-20100729.1/6.0/Server/x86_64/os" and then click 'ok' to continue.

7.Click next button untill to create storage page.

8.Select "Create custom layout" option and click next button.

9.Then create a valid storage and click next button to countinue install. 
 
10.Error dialog pop-up, details please refer to attachment"anaconda-tb-nODzBQ9E_2_u.xml"

Actual results:
Error dialog pop-up, install failed

Expected results:
No error dialog pop-up,install successfully.