[administrative][lvm] lvm 分区修改
默认安装的CentOS6.3操作系统，使用lvm分区。root挂载了50G，home挂载了1.5T。
由于需求要求，现在需要把home的1.5T全部移动到root下。
使用archiso启动，查看lvm信息如下：
root@archiso ~ # pvdisplay --- Physical volume --- PV Name /dev/sdb2 VG Name vg_t185 PV Size 931.02 GiB / not usable 4.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 238341 Free PE 0 Allocated PE 238341 PV UUID cK8ZW2-Mtcv-ry1H-7WU0-kLeD-i0M4-jipmh8
root@archiso ~ # lvdisplay --- Logical volume --- LV Path /dev/vg_t185/lv_root LV Name lv_root VG Name vg_t185 LV UUID 7IU9S2-S0cY-WG6L-7yLK-sWle-Ogtg-3bPC5y LV Write Access read/write LV Creation host, time T185, 2017-06-12 23:52:42 +0000 LV Status available # open 0 LV Size 50.00 GiB Current LE 12800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 254:0 --- Logical volume --- LV Path /dev/vg_t185/lv_home LV Name lv_home VG Name vg_t185 LV UUID RhQnwT-Ol18-ERl3-d2oD-O63V-IzWq-f1eTxB LV Write Access read/write LV Creation host, time T185, 2017-06-12 23:52:50 +0000 LV Status available # open 0 LV Size 849.51 GiB Current LE 217475 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 254:1 --- Logical volume --- LV Path /dev/vg_t185/lv_swap LV Name lv_swap VG Name vg_t185 LV UUID 5noJ0H-Sz1h-Kdo0-3elo-lhLw-HcRv-8dB8GY LV Write Access read/write LV Creation host, time T185, 2017-06-12 23:55:01 +0000 LV Status available # open 0 LV Size 31.51 GiB Current LE 8066 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 254:2
root@archiso ~ # vgdisplay --- Volume group --- VG Name vg_t185 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 931.02 GiB PE Size 4.00 MiB Total PE 238341 Alloc PE / Size 238341 / 931.02 GiB Free PE / Size 0 / 0 VG UUID DKq4iJ-p00S-PMji-zkgc-nip2-Y7gY-extOPT
当前状态是一个pv sdb2, 一个vg vg_t185, 三个lv lv_root, lv_swap, lv_home 。
思路就是： 1. 删掉lv_home. 2. 把分区添加到lv_root. 3. 在root下创建home目录。 4. 修改fstab
删除：
root@archiso ~ # lvremove vg_t185/lv_home Do you really want to remove active logical volume vg_t185/lv_home? [y/n]: y Logical volume "lv_home" successfully removed root@archiso ~ #
root@archiso ~ # lvdisplay --- Logical volume --- LV Path /dev/vg_t185/lv_root LV Name lv_root VG Name vg_t185 LV UUID 7IU9S2-S0cY-WG6L-7yLK-sWle-Ogtg-3bPC5y LV Write Access read/write LV Creation host, time T185, 2017-06-12 23:52:42 +0000 LV Status available # open 0 LV Size 50.00 GiB Current LE 12800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 254:0 --- Logical volume --- LV Path /dev/vg_t185/lv_swap LV Name lv_swap VG Name vg_t185 LV UUID 5noJ0H-Sz1h-Kdo0-3elo-lhLw-HcRv-8dB8GY LV Write Access read/write LV Creation host, time T185, 2017-06-12 23:55:01 +0000 LV Status available # open 0 LV Size 31.51 GiB Current LE 8066 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 254:2 root@archiso ~ # vgdisplay --- Volume group --- VG Name vg_t185 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 5 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 931.02 GiB PE Size 4.00 MiB Total PE 238341 Alloc PE / Size 20866 / 81.51 GiB Free PE / Size 217475 / 849.51 GiB VG UUID DKq4iJ-p00S-PMji-zkgc-nip2-Y7gY-extOPT root@archiso ~ #
扩充：
root@archiso ~ # lvextend -l +100%FREE -t /dev/vg_t185/lv_root /dev/sdb2 TEST MODE: Metadata will NOT be updated and volumes will not be (de)activated. Size of logical volume vg_t185/lv_root changed from 50.00 GiB (12800 extents) to 899.51 GiB (230275 extents). Logical volume lv_root successfully resized. root@archiso ~ # lvextend -l +100%FREE /dev/vg_t185/lv_root /dev/sdb2 Size of logical volume vg_t185/lv_root changed from 50.00 GiB (12800 extents) to 899.51 GiB (230275 extents). Logical volume lv_root successfully resized. root@archiso ~ #
root@archiso ~ # lvdisplay --- Logical volume --- LV Path /dev/vg_t185/lv_root LV Name lv_root VG Name vg_t185 LV UUID 7IU9S2-S0cY-WG6L-7yLK-sWle-Ogtg-3bPC5y LV Write Access read/write LV Creation host, time T185, 2017-06-12 23:52:42 +0000 LV Status available # open 0 LV Size 899.51 GiB Current LE 230275 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 254:0 --- Logical volume --- LV Path /dev/vg_t185/lv_swap LV Name lv_swap VG Name vg_t185 LV UUID 5noJ0H-Sz1h-Kdo0-3elo-lhLw-HcRv-8dB8GY LV Write Access read/write LV Creation host, time T185, 2017-06-12 23:55:01 +0000 LV Status available # open 0 LV Size 31.51 GiB Current LE 8066 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 254:2 root@archiso ~ #
修改fstab
1 root@archiso ~/mnt # diff etc/fstab fstab.bak 10a11 > /dev/mapper/vg_t185-lv_home /home ext4 defaults 1 2 1 root@archiso ~/mnt #
reboot
二， 新增一块硬盘来扩充。
为硬盘创建分区：
parted /dev/vdb mklabel gpt mkpart primary 1MiB 100%
创建物理卷
pvcreate /dev/vdb1
将新卷加入卷组
vgextend vg_t209 /dev/vdb1
逻辑卷扩充
lvextend -l +100%FREE -t /dev/vg_t209/lv_root /dev/vdb1
lvextend -l +100%FREE /dev/vg_t209/lv_root /dev/vdb1
这是，在文件系统里是看不见大小变化的。
我用的是ext4文件系统，然后还应该resize ext4, 使用如下方法：
https://pubmem.wordpress.com/2010/09/16/how-to-resize-lvm-logical-volumes-with-ext4-as-filesystem/
resize2fs -f /dev/mapper/vg_t209-lv_root
