1、拉伸逻辑卷调整容量
[root@desktop ~]# df ‐hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda1 xfs 9.8G 3.3G 6.5G 34% /
devtmpfs devtmpfs 660M 0 660M 0% /dev
tmpfs tmpfs 674M 0 674M 0% /dev/shm
tmpfs tmpfs 674M 8.9M 666M 2% /run
tmpfs tmpfs 674M 0 674M 0% /sys/fs/cgroup
/dev/mapper/vg0‐lv0 ext3 190M 1.6M 179M 1% /home <‐‐‐‐ 当前容量少于 290 MiB,所以要扩容
tmpfs tmpfs 135M 0 135M 0% /run/user/0
[root@desktop ~]# lvextend ‐L 290M /dev/vg0/lv0 <‐‐‐ 这是逻辑卷扩容的关键命令
Rounding size to boundary between physical extents: 292.00 MiB
Size of logical volume vg0/lv0 changed from 200.00 MiB (50 extents) to 292.00 MiB (73 extents).
Logical volume lv0 successfully resized.
[root@desktop ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv0 vg0 ‐wi‐ao‐‐‐‐ 292.00m <‐‐‐‐ 成功扩容了，容量一般都会有少量误差，这是正常现象
[root@desktop ~]# resize2fs /dev/vg0/lv0 <‐‐‐ 最后记得刷新文件系统的容量信息
resize2fs 1.42.9 (28‐Dec‐2013) （注意：如果文件系统是 xfs ,那么应该执行 xfs_growfs /dev/vg0/lv0 ）
Filesystem at /dev/vg0/lv0 is mounted on /home; on‐line resizing required
old_desc_blocks = 1, new_desc_blocks = 2
The filesystem on /dev/vg0/lv0 is now 299008 blocks long.
[root@desktop ~]# df ‐hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda1 xfs 9.8G 3.3G 6.5G 34% /
devtmpfs devtmpfs 660M 0 660M 0% /dev
tmpfs tmpfs 674M 0 674M 0% /dev/shm
tmpfs tmpfs 674M 8.9M 666M 2% /run
tmpfs tmpfs 674M 0 674M 0% /sys/fs/cgroup
/dev/mapper/vg0‐lv0 ext3 279M 2.1M 263M 1% /home <‐‐‐‐‐ 成功调整
tmpfs tmpfs 135M 0 135M 0% /run/user/0
2、缩小逻辑卷调整容量
[root@desktop ~]# umount /dev/vg0/lv0 <‐‐‐ 裁剪容量必须先卸载文件系统
[root@desktop ~]# e2fsck ‐f /dev/vg0/lv0 <‐‐‐ 裁剪前必须检测文件系统，以免把文件系统的错误扩大
工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/vg0/lv0: 11/75776 files (0.0% non‐contiguous), 15740/299008 blocks
[root@desktop ~]# resize2fs /dev/vg0/lv0 150M <‐‐ 必须先刷新文件系统的容量信息，这是与扩容相反的，顺序错了就会损坏
resize2fs 1.42.9 (28‐Dec‐2013)
Please run 'e2fsck ‐f /dev/vg0/lv0' first. <‐‐‐‐ 如果已经检测过，但执行多次还是这个提示，再次执行的时候添加参数 ‐f
[root@desktop ~]# resize2fs ‐f /dev/vg0/lv0 150M <‐‐‐‐ 添加参数 ‐f 强制调整
resize2fs 1.42.9 (28‐Dec‐2013)
Resizing the filesystem on /dev/vg0/lv0 to 153600 (1k) blocks.
The filesystem on /dev/vg0/lv0 is now 153600 blocks long.
[root@desktop ~]# lvreduce ‐L 150M /dev/vg0/lv0 <‐‐‐‐ 再裁剪逻辑卷设备的容量
Rounding size to boundary between physical extents: 152.00 MiB
WARNING: Reducing active logical volume to 152.00 MiB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv0? [y/n]: y <‐‐‐‐ 需要输入 y 进行确认
Size of logical volume vg0/lv0 changed from 292.00 MiB (73 extents) to 152.00 MiB (38 extents).
Logical volume lv0 successfully resized.
[root@desktop ~]# mount /dev/vg0/lv0 /home <‐‐‐ 如无意外，就能正确挂载
[root@desktop ~]# df ‐h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 9.8G 3.3G 6.5G 34% /
devtmpfs 660M 0 660M 0% /dev
tmpfs 674M 0 674M 0% /dev/shm
tmpfs 674M 8.9M 666M 2% /run
tmpfs 674M 0 674M 0% /sys/fs/cgroup
tmpfs 135M 0 135M 0% /run/user/0
/dev/mapper/vg0‐lv0 142M 1.6M 133M 2% /home