I have tested this in RHEL 4.7 AS and RHEL 5.3
In RHEL AS 4 you must:
- extend LV with lvextend -L<size> /dev/vg01/lv01
- then ext2online /dev/vg01/lv01
In RHEL 5:
- extend LV with lvextend -L<size> /dev/vg01/lv01
- then resize2fs /dev/vg01/lv01 <size>
There is no need to unmount the FS.
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