extend
1。lvextend -L+1G /dev/vg01/lv01
2。umount /mountingpoint
3。resize2fs /dev/vg01/lv01
4。mount /dev/vg01/lv01 /mountingpoint
reduce:
1。umount /mountingpoint
2。resize2fs /dev/vg01/lv01
3。lvreduce -L-1G /dev/vg01/lv01
4。mount /dev/vg01/lv01 /mountingpoint
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