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from: http://bbs.chinaunix.net/thread-3613556-1-1.html
试验环境: vmware下,centos6,64位版本,原来系统默认分区,/dev/sda3是LogVol01,挂载到/上.新添加一个30G的硬盘sdb,将新加的硬盘容量扩充到原来的/上去.
试验步骤:
1.sdb分区,只分一个sdb1 2.在sdb1上创建pv
显示下pv的情况
[root@localhost ~]# pvdisplay --- Physical volume --- PV Name /dev/sda3 VG Name VolGroup PV Size 18.80 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 4813 Free PE 0 Allocated PE 4813 PV UUID r3DcdH-tavS-z0dy-bTcg-F5fz-F8MF-dpAjW3
"/dev/sdb1" is a new physical volume of "30.00 GiB" --- NEW Physical volume --- PV Name /dev/sdb1 VG Name PV Size 30.00 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID 1Ynxmw-JblF-XAeE-ZKGD-0BSV-s7BL-SU1mql
3.查看系统现在vg的情况
[root@localhost ~]# vgdisplay --- Volume group --- VG Name VolGroup System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 3 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 1 Act PV 1 VG Size 18.80 GiB PE Size 4.00 MiB Total PE 4813 Alloc PE / Size 4813 / 18.80 GiB Free PE / Size 0 / 0 VG UUID Xdh5kq-vKjk-nroE-Dssd-mi1h-SQGK-R07tOn
4.扩容vg
正常会提示:Volume group "VolGroup" successfully extended
5.检查下扩容后vg的情况
[root@localhost ~]# vgdisplay --- Volume group --- VG Name VolGroup System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 2 Act PV 2 VG Size 48.80 GiB PE Size 4.00 MiB Total PE 12492 Alloc PE / Size 4813 / 18.80 GiB Free PE / Size 7679 / 30.00 GiB VG UUID Xdh5kq-vKjk-nroE-Dssd-mi1h-SQGK-R07tOn
6.查看下系统lv的情况
[root@localhost ~]# lvdisplay --- Logical volume --- LV Name /dev/VolGroup/LogVol01 VG Name VolGroup LV UUID IUVeUw-2bmN-mm3H-Gh16-fKaR-choS-IfSosr LV Write Access read/write LV Status available # open 1 LV Size 16.80 GiB Current LE 4301 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0
--- Logical volume --- LV Name /dev/VolGroup/LogVol00 VG Name VolGroup LV UUID U9WYdb-xAdg-tCe1-FPxo-UyVe-v5Gp-a8UlZR LV Write Access read/write LV Status available # open 1 LV Size 2.00 GiB Current LE 512 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1
7.扩容lv
[root@localhost ~]# lvextend /dev/VolGroup/LogVol01 /dev/sdb1 Extending logical volume LogVol01 to 46.80 GiB Logical volume LogVol01 successfully resized
8.检查下扩容后的lv
[root@localhost ~]# lvdisplay --- Logical volume --- LV Name /dev/VolGroup/LogVol01 VG Name VolGroup LV UUID IUVeUw-2bmN-mm3H-Gh16-fKaR-choS-IfSosr LV Write Access read/write LV Status available # open 1 LV Size 46.80 GiB Current LE 11980 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0
--- Logical volume --- LV Name /dev/VolGroup/LogVol00 VG Name VolGroup LV UUID U9WYdb-xAdg-tCe1-FPxo-UyVe-v5Gp-a8UlZR LV Write Access read/write LV Status available # open 1 LV Size 2.00 GiB Current LE 512 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1
9.现在系统的分区情况如下,/没有扩容
[root@localhost ~]# df -h 文件系统 容量 已用 可用 已用%% 挂载点 /dev/mapper/VolGroup-LogVol01 17G 8.3G 7.5G 53% / tmpfs 499M 0 499M 0% /dev/shm /dev/sda1 194M 25M 159M 14% /boot
10.将/扩容
[root@localhost ~]# resize2fs /dev/mapper/VolGroup-LogVol01 resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/mapper/VolGroup-LogVol01 is mounted on /; on-line resizing required old desc_blocks = 2, new_desc_blocks = 3 Performing an on-line resize of /dev/mapper/VolGroup-LogVol01 to 12267520 (4k) blocks. The filesystem on /dev/mapper/VolGroup-LogVol01 is now 12267520 blocks long.
11.扩容后分区的情况
[root@localhost ~]# df -h 文件系统 容量 已用 可用 已用%% 挂载点 /dev/mapper/VolGroup-LogVol01 47G 8.3G 36G 19% / tmpfs 499M 0 499M 0% /dev/shm /dev/sda1 194M 25M 159M 14% /boot
可以看到 /分区已经成功的从18G+,扩充到了47G
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原文地址：http://www.cnblogs.com/chenghuili/p/5287035.html
