LVM逻辑卷

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部署逻辑卷

1.添加两块硬盘，建立物理卷

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[root@localhost ~]# pvcreate /dev/sdb /dev/sdc
  Physical volume "/dev/sdb" successfully created
  Physical volume "/dev/sdc" successfully created

2.创建卷组 storage ，并将sdb，sdc加入到卷组stroage

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[root@localhost ~]# vgcreate storage /dev/sdb /dev/sdc
  Volume group "storage" successfully created

3.查看卷组状态

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[root@localhost ~]# vgdisplay 
  --- Volume group ---
  VG Name               storage
  System ID             
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               39.99 GiB
  PE Size               4.00 MiB
  Total PE              10238
  Alloc PE / Size       0 / 0   
  Free  PE / Size       10238 / 39.99 GiB
  VG UUID               Z9dr3u-7oni-yBLE-rfS9-xJ9g-p2aQ-s1VCUk

4.切割一个约为150MB的逻辑卷设备

#对逻辑卷切割有两种计量单位。
使用-L参数 -L 150M 生成150 MB 使用-l参数 -l 37 生成37*4=148MB（每个单元大小默认为4MB，按单元为计量单位）

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[root@localhost ~]# lvcreate -n vo -L 150M storage

5.格式化逻辑卷，并挂载

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[root@localhost ~]# mkfs.ext4 /dev/storage/vo
[root@localhost ~]# mkdir /LVM
[root@localhost ~]# mount /dev/storage/vo /LVM/

6.查看挂载状态，并写入配置文件，使其永久生效

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[root@localhost ~]# df -h
Filesystem              Size  Used Avail Use% Mounted on
/dev/sda3                18G  1.3G   17G   7% /
devtmpfs                904M     0  904M   0% /dev
tmpfs                   913M     0  913M   0% /dev/shm
tmpfs                   913M  8.7M  904M   1% /run
tmpfs                   913M     0  913M   0% /sys/fs/cgroup
/dev/sda1               297M  113M  185M  38% /boot
tmpfs                   183M     0  183M   0% /run/user/0
/dev/mapper/storage-vo  144M  1.6M  132M   2% /LVM
[root@localhost ~]# echo "/dev/storage/vo /LVM/ ext4 defaults 0 0" >> /etc/fstab

扩容逻辑卷

1.取消挂载

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[root@localhost ~]# umount /LVM/

2.扩展逻辑卷vo至290MB

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[root@localhost ~]# lvextend -L 290M /dev/storage/vo 
  Rounding size to boundary between physical extents: 292.00 MiB
  Size of logical volume storage/vo changed from 152.00 MiB (38 extents) to 292.00 MiB (73 extents).
  Logical volume vo successfully resized.

3.检查硬盘完整性，并重置硬盘容量

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[root@localhost ~]# e2fsck -f /dev/storage/vo 
e2fsck 1.42.9 (28-Dec-2013)
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/storage/vo: 11/38912 files (0.0% non-contiguous), 10567/155648 blocks


[root@localhost ~]# resize2fs /dev/storage/vo 
resize2fs 1.42.9 (28-Dec-2013)
Resizing the filesystem on /dev/storage/vo to 299008 (1k) blocks.
The filesystem on /dev/storage/vo is now 299008 blocks long.

4.重新挂载，并查看挂载状态

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[root@localhost ~]# mount /dev/storage/vo /LVM/
[root@localhost ~]# df -h
Filesystem              Size  Used Avail Use% Mounted on
/dev/sda3                18G  1.3G   17G   7% /
devtmpfs                904M     0  904M   0% /dev
tmpfs                   913M  8.7M  904M   1% /run
tmpfs                   913M     0  913M   0% /sys/fs/cgroup
/dev/mapper/storage-vo  279M  2.1M  259M   1% /LVM

缩小逻辑卷

1.取消挂载

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[root@localhost ~]# umount /LVM/

2.检查文件系统完整性

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[root@localhost ~]# e2fsck -f /dev/storage/vo 
e2fsck 1.42.9 (28-Dec-2013)
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/storage/vo: 11/75776 files (0.0% non-contiguous), 15729/299008 blocks

3.把逻辑卷vo容量减小 到 120MB

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[root@localhost ~]# resize2fs /dev/storage/vo 120M
resize2fs 1.42.9 (28-Dec-2013)
Resizing the filesystem on /dev/storage/vo to 122880 (1k) blocks.
The filesystem on /dev/storage/vo is now 122880 blocks long.

[root@localhost ~]# lvreduce -L 120M /dev/storage/vo 
  WARNING: Reducing active logical volume to 120.00 MiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce vo? [y/n]: y
  Size of logical volume storage/vo changed from 292.00 MiB (73 extents) to 120.00 MiB (30 extents).
  Logical volume vo successfully resized.

4.重新挂载文件系统并查看系统状态

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[root@localhost ~]# mount /dev/storage/vo /LVM/
[root@localhost ~]# df -h
Filesystem              Size  Used Avail Use% Mounted on
/dev/sda3                18G  1.3G   17G   7% /
devtmpfs                904M     0  904M   0% /dev
tmpfs                   913M  8.7M  904M   1% /run
tmpfs                   913M     0  913M   0% /sys/fs/cgroup
/dev/mapper/storage-vo  113M  1.6M  103M   2% /LVM

逻辑卷快照

#快照卷容量必须等于逻辑卷的已使用容量

#快照卷仅一次有效，一旦执行还原操作后会被立即删除
1.查看卷组信息，查看Alloc PE / Size 已使用容量

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vgdisplay

后面再写吧