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LVM 架构图

清除硬盘分区信息

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[root@localhost ~]# dd if=/dev/zero bs=512K count=1 of=/dev/sdc   #清空硬盘的分区表
[root@localhost ~]# dd if=/dev/zero bs=512K count=1 of=/dev/sdd   #清空硬盘的分区表
[root@localhost ~]# dd if=/dev/zero bs=512K count=1 of=/dev/sde   #清空硬盘的分区表
[root@localhost ~]# dd if=/dev/zero bs=512K count=1 of=/dev/sdf   #清空硬盘的分区表
[root@localhost ~]# sync                                          #将缓存的数据刷新到磁碟上
[root@localhost ~]# partprobe                                     #通知内核更新分区表

创建PV physical volume ，物理卷在逻辑卷管理系统最底层，可为整个物理硬盘或实际物理硬盘上的分区。

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[root@localhost ~]# pvcreate /dev/sdc /dev/sdd /dev/sde /dev/sdf
  Physical volume "/dev/sdc" successfully created.
  Physical volume "/dev/sdd" successfully created.
  Physical volume "/dev/sde" successfully created.
  Physical volume "/dev/sdf" successfully created.
[root@localhost ~]#

如果想撤销对某块硬盘的操作

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[root@localhost ~]# pvremove /dev/sd?    #删除物理卷

验证PV：

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其中 /dev/sdc, /dev/sdd, /dev/sde, /dev/sdf 是我刚创建的
[root@localhost ~]# pvscan
  PV /dev/sdb2   VG centos          lvm2 [<464.76 GiB / 4.00 MiB free]
  PV /dev/sdd                       lvm2 [<5.46 TiB]
  PV /dev/sde                       lvm2 [<5.46 TiB]
  PV /dev/sdf                       lvm2 [<5.46 TiB]
  PV /dev/sdc                       lvm2 [<5.46 TiB]
  Total: 5 [<22.29 TiB] / in use: 1 [<464.76 GiB] / in no VG: 4 [21.83 TiB]
[root@localhost ~]#

创建 卷组

Volume Groups

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[root@localhost ~]# vgcreate data_pool /dev/sdc /dev/sdd /dev/sde /dev/sdf   #将4个PV纳入一个存储池， 池子名字为 data_pool
  Volume group "data_pool" successfully created
[root@localhost ~]#

验证：

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[root@localhost ~]# vgs
  VG        #PV #LV #SN Attr   VSize    VFree
  centos      1   3   0 wz--n- <464.76g  4.00m
  data_pool   4   0   0 wz--n-   21.83t 21.83t
[root@localhost ~]#

如果想删除卷组

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[root@localhost ~]# vgremove data_pool # 指定卷组的名字

创建逻辑卷 logical volume

一个卷组可以分割为很多个逻辑卷， 此时我只需要一个逻辑卷， 占用卷组的全部空间

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[root@localhost ~]# lvcreate --extents 100%FREE --name LV_Data data_pool
  Logical volume "LV_Data" created.
[root@localhost ~]#

验证

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[root@localhost ~]# lvs
  LV      VG        Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home    centos    -wi-ao---- 407.00g
  root    centos    -wi-ao----  50.00g
  swap    centos    -wi-ao----   7.75g
  LV_Data data_pool -wi-a-----  21.83t         # 可以看到 逻辑卷LV_Data 隶属于data_pool卷组， 其容量为21.83TB
[root@localhost ~]#

如果创建的不够满意， 可以删除

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[root@localhost ~]# lvremove -y  /dev/data_pool/LV_Data

使用逻辑卷 LV_Data

初始化 逻辑卷 LV_Data， 将其格式化为 ext4 文件系统

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[root@localhost ~]# mkfs.ext4 /dev/data_pool/LV_Data
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
366282752 inodes, 5860519936 blocks
293025996 blocks (5.00%) reserved for the super user
First data block=0
178849 block groups
32768 blocks per group, 32768 fragments per group
2048 inodes per group
Superblock backups stored on blocks:
    32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
    4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
    102400000, 214990848, 512000000, 550731776, 644972544, 1934917632,
    2560000000, 3855122432, 5804752896

Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

[root@localhost ~]#

挂载

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[root@localhost ~]# mkdir /mnt/LV_Data
[root@localhost ~]# mount /dev/data_pool/LV_Data /mnt/LV_Data
[root@localhost ~]# df -hT
Filesystem                    Type      Size  Used Avail Use% Mounted on
/dev/mapper/centos-root       xfs        50G  2.1G   48G   5% /
devtmpfs                      devtmpfs  3.8G     0  3.8G   0% /dev
tmpfs                         tmpfs     3.8G     0  3.8G   0% /dev/shm
tmpfs                         tmpfs     3.8G   14M  3.8G   1% /run
tmpfs                         tmpfs     3.8G     0  3.8G   0% /sys/fs/cgroup
/dev/sdb1                     xfs      1014M  143M  872M  15% /boot
/dev/mapper/centos-home       xfs       407G  1.1G  406G   1% /home
tmpfs                         tmpfs     771M     0  771M   0% /run/user/1000
tmpfs                         tmpfs     771M     0  771M   0% /run/user/0
/dev/mapper/data_pool-LV_Data ext4       22T   20K   21T   1% /mnt/LV_Data
[root@localhost ~]#

开机自动挂载

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[root@localhost ~]# umount /dev/data_pool/LV_Data
[root@localhost ~]# mkdir /mnt/sas_disk/
[root@localhost hexo]# blkid /dev/SAS_pool/SAS_LVM
/dev/SAS_pool/SAS_LVM: UUID="6ead9007-eceb-4b92-af74-bf376b9baa3a" TYPE="xfs"
[root@localhost hexo]#
[root@localhost ~]# echo "UUID=6ead9007-eceb-4b92-af74-bf376b9baa3a  /mnt/sas_disk/         xfs     defaults        0 0" >> /etc/fatab
[root@localhost ~]# mount -a
[root@localhost ~]# df -h

验证

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[root@localhost ~]# reboot
[root@localhost ~]# df -h

缩小LVM

卸载已挂载的 LV

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[root@localhost ~]# umount /dev/data_pool/LV_Data

EXT4 文件系统缩小（XFS文件系统不支持缩小操作）

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[root@localhost ~]# resize2fs -f /dev/data_pool/LV_Data  15T            #速度极慢， 22T已用20K 缩小为15T 耗时10分钟， 大家可以参考一下
resize2fs 1.42.9 (28-Dec-2013)
Resizing the filesystem on /dev/data_pool/LV_Data to 4026531840 (4k) blocks.
The filesystem on /dev/data_pool/LV_Data is now 4026531840 blocks long.

调整LV大小

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[root@localhost ~]# lvresize -L 15T /dev/data_pool/LV_Data

查询操作

使用 lvs 查看 调整之后lv 大小

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[root@localhost ~]# lvs
  LV      VG       Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  SAS_LVM SAS_pool -wi-ao----  21.83t
  home    centos   -wi-ao---- 407.00g
  root    centos   -wi-ao----  50.00g
  swap    centos   -wi-ao----   7.75g
[root@localhost ~]#

使用vgs 查看存储池 剩余

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[root@localhost ~]# vgs
  VG       #PV #LV #SN Attr   VSize    VFree
  SAS_pool   4   1   0 wz--n-   21.83t    0
  centos     1   3   0 wz--n- <464.76g 4.00m
[root@localhost ~]#

使用pvs 查看参与存储池的硬盘

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[root@localhost ~]# pvs
  PV         VG       Fmt  Attr PSize    PFree
  /dev/sdb2  centos   lvm2 a--  <464.76g 4.00m
  /dev/sdc   SAS_pool lvm2 a--    <5.46t    0
  /dev/sdd   SAS_pool lvm2 a--    <5.46t    0
  /dev/sde   SAS_pool lvm2 a--    <5.46t    0
  /dev/sdf   SAS_pool lvm2 a--    <5.46t    0
[root@localhost ~]#