Description of problem:
The customer got the following messages when they install RHEL with raid5 44TiB disk.

~~~
Not enough space in file systems for the current software selection.An additional 1998.98 MiB is needed.
Please make your choice from above ['q' to quit | 'b' to begin installation | 'r' to refresh]
~~~


Version-Release number of selected component (if applicable):
anaconda-19.31.123-1.el7


How reproducible:
100%


Steps to Reproduce:
The customer used the following configuration for kickstart with raid5 44TiB disk.

~~~
bootloader --location=mbr --boot-drive=sda
zerombr
clearpart --all --initlabel --drives=sda
part biosboot --fstype="biosboot" --ondisk=sda --size=1 --label=biosboot
part /boot --fstype="xfs" --ondisk=sda --size=1024 --fsoptions="defaults,noatime" --label=boot
part swap --fstype="swap" --ondisk=sda --recommended --label=swap
part / --fstype="xfs" --grow --ondisk=sda --size=10240 --fsoptions="defaults,noatime" --label=root
~~~


Actual results:
Not enough space in file systems for the current software selection.An additional 1998.98 MiB is needed.
Please make your choice from above ['q' to quit | 'b' to begin installation | 'r' to refresh]


Expected results:
Space is available and installable


Additional info:
The customer tried to test the following Fedora rawhide with raid5 44TiB disk.

~~~
https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Server/x86_64/os/images/
~~~

And they could install Fedora rawhide.