How to run e2fsck on partitions of internal disks?

[Zoltan Boszormenyi]

Hi,

I am using Fedora 17 and recently I got two Oopses:
https://bugzilla.redhat.com/show_bug.cgi?id=852724

I suspect there *may* be some on-disk corruption but
I can't seem to be able to run e2fsck on my /home
which is 3.6TB in size. I booted into single mode and
ran "umount /home" but e2fsck on my home partition
still reports "resource is busy". lsof doesn't tell me
what's using the partition.

How can I run fsck on /home or maybe on / for that matter?
I guess booting the Fedora 17 DVD in rescue mode can be
used. But how to do it without it? I have used yum to upgrade
from F16 (and F14 before) and don't have the DVD at hand.

Thanks in advance,
Zoltán Böszörményi