LVM 逻辑卷管理器-增大LV的容量
步骤：
（1）新增一个8e systemID的分区；
（2）用pvcreate命令构建PV；
（3）用vgextend命令将PV加入vg_1；
（4）用lvresize命令将新加入的PV内的PE加入lv_1中；
（5）通过resize2fs命令将LV的容量扩充到整个文件系统；
（1）新增一个8e systemID的分区；由于前面创建的是4个主分区，如果想要再创建一个新分区，则需要把/dev/sdb4删除，创建一个扩展分区，然后在扩展分区下新增8e systemID的分区，步骤如下：
[root@centos6 ~]# df -h #查看lvm挂载情况
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 16G 1.5G 14G 11% /
tmpfs 112M 0 112M 0% /dev/shm
/dev/sda1 194M 29M 155M 16% /boot
/dev/mapper/vg_1-lv_1 20G 172M 19G 1% /mnt/lvm
[root@centos6 ~]# umount /mnt/lvm/ #卸载lvm
[root@centos6 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 16G 1.5G 14G 11% /
tmpfs 112M 0 112M 0% /dev/shm
/dev/sda1 194M 29M 155M 16% /boot
[root@centos6 ~]# lvremove /dev/vg_1/lv_1 #删除lv_1
Do you really want to remove active logical volume lv_1? [y/n]: y
Logical volume "lv_1" successfully removed
[root@centos6 ~]# lvs
[root@centos6 ~]# vgreduce vg_1 /dev/sdb4 #将/dev/sdb4从vg_1中移除
Removed "/dev/sdb4" from volume group "vg_1"
[root@centos6 ~]# pvremove /dev/sdb4 #将/dev/sdb4从pv中移除
Labels on physical volume "/dev/sdb4" successfully wiped
[root@centos6 ~]# pvs #查看pv的情况
PV VG Fmt Attr PSize PFree
/dev/sdb1 vg_1 lvm2 a-- 5.00g 5.00g
/dev/sdb2 vg_1 lvm2 a-- 5.00g 5.00g
/dev/sdb3 vg_1 lvm2 a-- 5.00g 5.00g
[root@centos6 ~]# fdisk /dev/sdb #进入/dev/sdb磁盘中划分分区
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): p
Disk /dev/sdb: 85.9 GB, 85899345920 bytes
255 heads, 63 sectors/track, 10443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x60710230
Device Boot Start End Blocks Id System
/dev/sdb1 1 654 5253223+ 8e Linux LVM
/dev/sdb2 655 1308 5253255 8e Linux LVM
/dev/sdb3 1309 1962 5253255 8e Linux LVM
/dev/sdb4 1963 2616 5253255 8e Linux LVM
Command (m for help): d #删除/dev/sdb4分区
Partition number (1-4): 4
Command (m for help): p
Disk /dev/sdb: 85.9 GB, 85899345920 bytes
255 heads, 63 sectors/track, 10443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x60710230
Device Boot Start End Blocks Id System
/dev/sdb1 1 654 5253223+ 8e Linux LVM
/dev/sdb2 655 1308 5253255 8e Linux LVM
/dev/sdb3 1309 1962 5253255 8e Linux LVM
Command (m for help): n
Command action
e extended
p primary partition (1-4)
e
Selected partition 4 #创建一个扩展分区
First cylinder (1963-10443, default 1963):
Using default value 1963
Last cylinder, +cylinders or +size{K,M,G} (1963-10443, default 10443): +10G
Command (m for help): p
Disk /dev/sdb: 85.9 GB, 85899345920 bytes
255 heads, 63 sectors/track, 10443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x60710230
Device Boot Start End Blocks Id System
/dev/sdb1 1 654 5253223+ 8e Linux LVM
/dev/sdb2 655 1308 5253255 8e Linux LVM
/dev/sdb3 1309 1962 5253255 8e Linux LVM
/dev/sdb4 1963 3268 10490445 5 Extended
Command (m for help): n #创建一个新的分区
First cylinder (1963-3268, default 1963):
Using default value 1963
Last cylinder, +cylinders or +size{K,M,G} (1963-3268, default 3268): +5G
Command (m for help): p
Disk /dev/sdb: 85.9 GB, 85899345920 bytes
255 heads, 63 sectors/track, 10443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x60710230
Device Boot Start End Blocks Id System
/dev/sdb1 1 654 5253223+ 8e Linux LVM
/dev/sdb2 655 1308 5253255 8e Linux LVM
/dev/sdb3 1309 1962 5253255 8e Linux LVM
/dev/sdb4 1963 3268 10490445 5 Extended
/dev/sdb5 1963 2616 5253223+ 83 Linux
Command (m for help): t
Partition number (1-5): 5
Hex code (type L to list codes): 8e #将/dev/sdb5分区的systemID改成8e
Changed system type of partition 5 to 8e (Linux LVM)
Command (m for help): p
Disk /dev/sdb: 85.9 GB, 85899345920 bytes
255 heads, 63 sectors/track, 10443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x60710230
Device Boot Start End Blocks Id System
/dev/sdb1 1 654 5253223+ 8e Linux LVM
/dev/sdb2 655 1308 5253255 8e Linux LVM
/dev/sdb3 1309 1962 5253255 8e Linux LVM
/dev/sdb4 1963 3268 10490445 5 Extended
/dev/sdb5 1963 2616 5253223+ 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@centos6 ~]# partprobe
创建lv，并挂载；
[root@centos6 ~]# lvcreate -L 15G -n lv_1 vg_1 Logical volume "lv_1" created [root@centos6 ~]# lvs LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert lv_1 vg_1 -wi-a----- 15.00g [root@centos6 ~]# mkfs -t ext4 /dev/vg_1/lv_1 [root@centos6 ~]# mount /dev/vg_1/lv_1 /mnt/lvm [root@centos6 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 16G 1.5G 14G 11% / tmpfs 112M 0 112M 0% /dev/shm /dev/sda1 194M 29M 155M 16% /boot /dev/mapper/vg_1-lv_1 15G 166M 14G 2% /mnt/lvm
（2）新建新的PV；
[root@centos6 ~]# pvcreate /dev/sdb5 Physical volume "/dev/sdb5" successfully created [root@centos6 ~]# pvs PV VG Fmt Attr PSize PFree /dev/sdb1 vg_1 lvm2 a-- 5.00g 0 /dev/sdb2 vg_1 lvm2 a-- 5.00g 0 /dev/sdb3 vg_1 lvm2 a-- 5.00g 0 /dev/sdb5 lvm2 a-- 5.01g 5.01g
（3）用vgextend命令将PV加入vg_1；
[root@centos6 ~]# vgextend vg_1 /dev/sdb5 Volume group "vg_1" successfully extended [root@centos6 ~]# vgs VG #PV #LV #SN Attr VSize VFree vg_1 4 1 0 wz--n- 20.00g 5.00g [root@centos6 ~]# vgdisplay --- Volume group --- VG Name vg_1 System ID Format lvm2 Metadata Areas 4 Metadata Sequence No 15 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 1 Max PV 0 Cur PV 4 Act PV 4 VG Size 20.00 GiB PE Size 16.00 MiB Total PE 1280 Alloc PE / Size 960 / 15.00 GiB Free PE / Size 320 / 5.00 GiB #剩余320个PE，容量为5G VG UUID NpO8m2-s4rx-WOIA-SbCt-yqQV-MU1w-wru4cS
（4）用lvresize命令将新加入的PV内的PE加入lv_1中；
[root@centos6 ~]# lvresize -l +320 /dev/vg_1/lv_1 Extending logical volume lv_1 to 20.00 GiB Logical volume lv_1 successfully resized [root@centos6 ~]# lvdisplay --- Logical volume --- LV Path /dev/vg_1/lv_1 LV Name lv_1 VG Name vg_1 LV UUID n2bChT-rimu-eRDs-5onU-mgUF-ukuh-NqO7me LV Write Access read/write LV Creation host, time centos6.5, 2016-09-09 19:04:37 +0800 LV Status available # open 1 LV Size 20.00 GiB #查看LV的容量已经变成了20G Current LE 1280 Segments 4 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 [root@centos6 ~]# df -h /mnt/lvm/ Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_1-lv_1 15G 166M 14G 2% /mnt/lvm #查看/mnt/lvm目录的容量还是15G，没有变化 [root@centos6 ~]# dumpe2fs /dev/vg_1/lv_1
（5）通过resize2fs命令将LV的容量扩充到整个文件系统；
[root@centos6 ~]# resize2fs /dev/vg_1/lv_1 resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/vg_1/lv_1 is mounted on /mnt/lvm; on-line resizing required old desc_blocks = 1, new_desc_blocks = 2 Performing an on-line resize of /dev/vg_1/lv_1 to 5242880 (4k) blocks. The filesystem on /dev/vg_1/lv_1 is now 5242880 blocks long. [root@centos6 ~]# df -h /mnt/lvm/ Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_1-lv_1 20G 170M 19G 1% /mnt/lvm #/mnt/lvm目录的容量已经变成了20G
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