I have a CentOS machine with 1 hard drive and partition as follow:[root@localhost var]# fdisk -lDisk /dev/sda: 214.7 GB, 214748364800 bytes255 heads, 63 sectors/track, 26108 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes   Device Boot      Start         End      Blocks   Id  System/dev/sda1   *           1          19      152586   83  Linux/dev/sda2              20         280     2096482+  82  Linux swap / Solaris/dev/sda3             281        2610    18715725   8e  Linux LVM[root@localhost var]# vgs  VG      #PV #LV #SN Attr   VSize  VFree  vg_root   1   3   0 wz--n- 17.84G    0[root@localhost var]# pvs  PV         VG      Fmt  Attr PSize  PFree  /dev/sda3  vg_root lvm2 a--  17.84G    0[root@localhost var]# lvdisplay  --- Logical volume ---  LV Name                /dev/vg_root/lv_root  VG Name                vg_root  LV UUID                YFfzh2-03mH-zrHa-INJn-iqxZ-vYpo-XDyimP  LV Write Access        read/write  LV Status              available  # open                 1  LV Size                8.91 GB  Current LE             285  Segments               2  Allocation             inherit  Read ahead sectors     auto  - currently set to     256  Block device           253:0  --- Logical volume ---  LV Name                /dev/vg_root/lv_var_lib_mysql  VG Name                vg_root  LV UUID                xdoJuc-21WP-99ZW-5aOE-bINc-fgYF-qP50vw  LV Write Access        read/write  LV Status              available  # open                 1  LV Size                5.94 GB  Current LE             190  Segments               1  Allocation             inherit  Read ahead sectors     auto  - currently set to     256  Block device           253:1  --- Logical volume ---  LV Name                /dev/vg_root/lv_zenoss_perf  VG Name                vg_root  LV UUID                ByUzF7-wYab-R9q5-3h4o-S3AI-L0HH-2Kn07p  LV Write Access        read/write  LV Status              available  # open                 1  LV Size                3.00 GB  Current LE             96  Segments               1  Allocation             inherit  Read ahead sectors     auto  - currently set to     256  Block device           253:2The /dev/sda is showing the total size of 214.7GB.How can I extend the size for each logical volume by 20GB?Thank you,
Extend partition
partition