这里记录一些任务用到的快速命令，详细LVM管理可参考：
http://wenku.baidu.com/view/c29b8bc4bb4cf7ec4afed0ad.html
1.把home分区的磁盘空间移到/根目录
[root@localhost ~]# lvs LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert lv_home VolGroup -wi-a----- 353.23g lv_root VolGroup -wi-ao---- 50.00g lv_swap VolGroup -wi-ao---- 4.00g [root@localhost ~]# pvs PV VG Fmt Attr PSize PFree /dev/sda3 VolGroup lvm2 a-- 407.23g 0 [root@localhost ~]# lvremove /dev/VolGroup/lv_home Do you really want to remove active logical volume lv_home? [y/n]: y Logical volume "lv_home" successfully removed [root@localhost ~]# lvextend /dev/VolGroup/lv_root /dev/sda3 Extending logical volume lv_root to 403.23 GiB Logical volume lv_root successfully resized [root@localhost ~]# resize2fs /dev/VolGroup/lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required old desc_blocks = 4, new_desc_blocks = 26 Performing an on-line resize of /dev/VolGroup/lv_root to 105704448 (4k) blocks. The filesystem on /dev/VolGroup/lv_root is now 105704448 blocks long. [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 397G 2.9G 374G 1% / tmpfs 127G 224K 127G 1% /dev/shm /dev/sda2 485M 39M 421M 9% /boot /dev/sda1 200M 260K 200M 1% /boot/efi [root@localhost ~]#
最后别忘了vim /etc/fstab
把里面关于lv_home的那行删除，否则重启会出错，万一出错，使用
mount -w -o remount /
重新挂载文件系统删除相应行即可。
2. 给根目录增加空间
add a disk size 200G /dev/sdb pvcreate /dev/sdb vgextend VolGroup /dev/sdb lvextend /dev/VolGroup/lv_root /dev/sdb resize2fs /dev/VolGroup/lv_root #rhel 6 and below fdisk -l
对于RHEL7以上，因为使用XFS做为文件系统，使用resize2fs会报错，请用xfs_growfs代替：
[root@localhost ~]# xfs_growfs /dev/rhel/root
meta-data=/dev/mapper/rhel-root isize=256 agcount=4, agsize=1026816 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=4107264, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 4107264 to 17223680
[root@localhost ~]# df
3. Reduce
Sometimes when we are running out of disk space in our linux box and if partition created on LVM , then we can make some free space in the volume group by reducing the LVM using lvreduce command.In this article we will discuss the required steps to reduce the size of LVM safely .
Scenario : Suppose we want to reduce /home by 2GB which is LVM and formated as ext4.
[root@cloud ~]# df -h /home/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_cloud-LogVol00
12G 9.2G 1.9G 84% /home
Step:1 Umount the filesystem
[root@cloud ~]# umount /home/
Step:2 check the filesystem for Errors using e2fsck command .
[ root@cloud ~]# e2fsck -f /dev/mapper/vg_cloud-LogVol00
e2fsck 1.41.12 (17-May-2010)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/mapper/vg_cloud-LogVol00: 12/770640 files (0.0% non-contiguous), 2446686/3084288 blocks
Note: In the above command e2fsck , we use the option '-f' to forcefully check the filesystem , even if the filesystem is clean.
Step:3 Shrink the size of /home to desire size.
As shown in the above scenario , size of /home is 12 GB , so by reducing it by 2GB , then the size will become 10GB.
[root@cloud ~]# resize2fs /dev/mapper/vg_cloud-LogVol00 10G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/vg_cloud-LogVol00 to 2621440 (4k) blocks.
The filesystem on /dev/mapper/vg_cloud-LogVol00 is now 2621440 blocks long.
Step:4 Now reduce the size using lvreduce command.
[root@cloud ~]# lvreduce -L 10G /dev/mapper/vg_cloud-LogVol00
WARNING: Reducing active logical volume to 10.00 GiB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce LogVol00? [y/n]: y
Reducing logical volume LogVol00 to 10.00 GiB
Logical volume LogVol00 successfully resized
Step:5 ( Optional) For the safer side , now check the reduced filesystem for errors
[root@cloud ~]# e2fsck -f /dev/mapper/vg_cloud-LogVol00
e2fsck 1.41.12 (17-May-2010)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/mapper/vg_cloud-LogVol00: 12/648960 files (0.0% non-contiguous), 2438425/2621440 blocks
Step:6 Mount the file system and verify the size.
[root@cloud ~]# mount /home/
[root@cloud ~]# df -h /home/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_cloud-LogVol00
9.9G 9.2G 208M 98% /home
从LVM 添加和移除硬盘
add disk to vm pvcreate /dev/sdb vgextend vg00 /dev/sdb lvcreate --size 1g -name sas /dev/vg00/sas mkdir /mnt/sas mount /dev/vg00/sas /mnt/sas remove disk from lvm umount /dev/vg00/sas lvremove /dev/vvg00/sas vgreduce vg00 /dev/sdb pvremove /dev/sdb remove disk from hardware