Description of problem:

If disks are added during the %pre section, the drive dictionary is not updated.
When attempting to partition this disk in the kickstart file.

Anaconda will raise an exception:
"Specified nonexistent disk sdb in partition command"

I believe this can be worked around by adding         

isys.flushDriveDict() to the Partition class (in kickstart.py) before         hds = isys.hardDriveDict()

Version-Release number of selected component (if applicable):

anaconda-11.1.2.113


How reproducible:

Every time.

Steps to Reproduce:
1. Build a kickstart file that adds a disk (iscsi on the non kickstart network ) during %pre
2. Set up the disks partitioning layout in the regular section of kickstart.
3. Boot the system with the kickstart
  
Actual results:

"Specified nonexistent disk sdb in partition command"

Expected results:

Partitioning to continue.

Additional info:

This is a strange configuration as the iscsi storage is on a different network than the kickstart storage network.