As root Copy the filesystem in another one e.g.
cd /usr; find. -print| cpio -dpuml /<backup-copy-filesystem>
Ah but you did an extendfs...
So when you say you have plenty of space on another filesytem do you mean you have no more free PE ?
Which case you will have to do the above to where you have room:
cd /;
find usr -depth|cpio -xdump /<where you can spare the space>
umount /dev/vg00/lvol7;
I imagine now you have not much choice:
rmdir /usr
ln -s /<where you copied usr> /usr
And now test!!
If all is fine and works
You will have to remove the logical volume and recreate it then do the copy the other way round by mounting lvol7 on lets say /usr2 in order to do the transfer then remove the link and mount lvol7 on /usr (dont forget the mkdir...)
vbe,
You mean that we run this command in single user mode or multimode? One more thing. From the commands that you give, is this possible to aplly for lvreduce also?