umount sda2

how to unmount sda2 and where to find it, my linux os is centos 4.2, I using samba, webmin, I also using trueimage to try and clone my linux os but I am ask to unmount sda2 and when I type
# umount /dev/sda2 it give me error of (device busy). I love for any device related to the problem. could you please help me.
Thank You
tpsbizAsked:
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m1tk4Commented:
post here the result of your

mount

command. If /dev/sda2 is the partition that contains your Linux and/or boot you can only unmount it if you boot from a cd.
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ravenplCommented:
mount | grep /dev/sda2 # will give You directory uner which this partition is mounted
Say, it's /mnt/sda2
then
lsof | grep /mnt/sda2 # will give You all processnames, who uses sny file/dir within /mnt/sda2 - shutdown them all
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