The resize2fs on RHEL5 does not support ext4. Your error message is the one reported when you try to resize an ext4 filesystem with ext2/ext3 tools. You need to either install e4fsprogrs and use resize4fs (and e4fsck), or do the resize in the virtual machine you are apparently running a newer OS in.lvresize to extend an lvm ? how
also I cant create a new lvm don't have that much space and the to extend the new one and it would mean downtime . don't think it's an issue with filesystem tools , lvm has NEVER been consistent in my case .