Previous bug 233391 against test:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=233391



Description of problem:
yum miscalculates disk requirements when disk space is low:
[snip]
Transaction Summary
=============================================================================
Install      0 Package(s)
Update      52 Package(s)
Remove       0 Package(s)

Total download size: 76 M
[snip]

Error Summary
-------------
Disk Requirements:
  At least 5732MB needed on the /usr filesystem.

[root] xm-fc7-001 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
[snip]
/dev/mapper/rootvg-usr_lv
                      1.9G  1.7G  119M  94% /usr


Version-Release number of selected component (if applicable):
yum-3.1.4-1.fc7

How reproducible:
Run "yum update" with less space than required for updates.


Steps to Reproduce:
1. Run yum update with less space than needed for proper installation

Actual results:
yum reports that Disk Requirements are close to 6Gig whereas the proper number
is about 50M extra needed.

Expected results:

yum disk space number should be correct
Additional info:

Possibly related to bug id=209980