RHEL server LUN paths goes offline during failover

Description of problem:

Client is attempting to kickstart RHEL5 to a blade system with SAN attached
storage. The customer is hitting an issue where anaconda complains with the
following message at the beginning of the install:

On virt console 1:
Warning: /dev/sda is a read-only filesystem and hit OK to continue

On virt console 3:
parted exception: Warning: Unable to open /dev/sda read-write
(Read-only file system). /dev/sda has been opened read-only

The customer has to hit OK to accept this and the installation will then
complete successfully.

There are currently two LUNs presented from the SAN to the host. /dev/sda is
indeed read-only and apparently it is a gatekeeper type device that is
exported/presented to numerous hosts hence why it's read-only. /dev/sdb is the
second LUN device that we want to install to.

I've tried using the following entries in the kickstart file:
ignoredisk --drives=sda
clearpart --all --drives=sdb
partition /boot --fstype=ext3 --size=200 --ondisk=sdb
partition pv.03 --size=1 --grow --ondisk=sdb
<and create vg and lv......>

And removing the zerombr reference but the customer is still hitting the issue.

How reproducible:
1. Install via kickstart or manual
2. Kickstart profile uses 'ignoredisk=sda' to ignore first LUN
3. Still prompted by anaconda that sda is read-only
4. Hitting Ok or Ignore will continue the installation
Version-Release number of selected component (if applicable):

Steps to Reproduce:
1. Install via kickstart or manual
2. Kickstart profile uses 'ignoredisk=sda' to ignore first LUN
3. Still prompted by anaconda that sda is read-only
4. Hitting Ok or Ignore will continue the installation

Actual results:
User prompted to hit OK when /dev/sda device is found to be read-only

Expected results:
ignoredisk directive in kickstart should indicate which devices to ignore and
not present a warning that it's read-only.

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