RHEL6 File system shrink
#take back-up
umount /opt
e2fsck -f /dev/mapper/VolGroup00-optvol
resize2fs /dev/mapper/VolGroup00-optvol 150G
lvchange -an /dev/mapper/VolGroup00-optvol
lvreduce -L 150G /dev/mapper/VolGroup00-optvol
lvchange -ay /dev/mapper/VolGroup00-optvol
e2fsck -f /dev/mapper/VolGroup00-optvol
RHEL6 File system extent on-line root fs
lvextend VolGroup00/rootvol -L +230G
resize2fs /dev/mapper/VolGroup00-rootvol 271G
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