CentOS调整LVM分区
0x00 前言
打算把/dev/mapper/VolGroup00-LogVol03逻辑卷的2.5T空间重新分配给/dev/mapper/VolGroup00-LogVol00。
0x01 查看磁盘空间
$ df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 99G 96G 0 100% /
devtmpfs 63G 0 63G 0% /dev
tmpfs 63G 0 63G 0% /dev/shm
tmpfs 63G 25M 63G 1% /run
tmpfs 63G 0 63G 0% /sys/fs/cgroup
/dev/sda1 240M 86M 138M 39% /boot
/dev/mapper/VolGroup00-LogVol01 40G 365M 37G 1% /var
/dev/mapper/VolGroup00-LogVol02 976M 19M 891M 2% /tmp
/dev/mapper/VolGroup00-LogVol03 2.6T 89M 2.5T 1% /da1
tmpfs 13G 0 13G 0% /run/user/448376178
可以看到根目录已经没有可用空间了，而/da1这个目录还有2.5T可用。
0x02 卸载要缩减的目录/da1
umount /da
如果提示target is busy. 可以用fuser命令解除占用
0x04 调整分区大小
resize2fs -p /dev/mapper/VolGroup00-LogVol03 90M
输出
resize2fs 1.42.9 (28-Dec-2013)
Please run 'e2fsck -f /dev/mapper/VolGroup00-LogVol03' first.
按照提示运行
e2fsck -f /dev/mapper/VolGroup00-LogVol03
输出
e2fsck 1.42.9 (28-Dec-2013)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
/lost+found not found. Create<y>? yes
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/mapper/VolGroup00-LogVol03: ***** FILE SYSTEM WAS MODIFIED *****
/dev/mapper/VolGroup00-LogVol03: 11/173842432 files (0.0% non-contiguous), 10970219/695369728 blocks
再执行一遍分区命令
resize2fs -p /dev/mapper/VolGroup00-LogVol03 90M
输出
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: New size smaller than minimum (1434844)
0x05 挂载目录/da1
mount /da1/
查看磁盘大小
df -lh
输出
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 99G 96G 0 100% /
devtmpfs 63G 0 63G 0% /dev
tmpfs 63G 0 63G 0% /dev/shm
tmpfs 63G 25M 63G 1% /run
tmpfs 63G 0 63G 0% /sys/fs/cgroup
/dev/sda1 240M 86M 138M 39% /boot
/dev/mapper/VolGroup00-LogVol01 40G 365M 37G 1% /var
/dev/mapper/VolGroup00-LogVol02 976M 19M 891M 2% /tmp
tmpfs 13G 0 13G 0% /run/user/448376178
/dev/mapper/VolGroup00-LogVol03 2.6T 89M 2.5T 1% /da1
没有看到变化
0x06 释放留出来的空间
lvreduce -L 90M /dev/mapper/VolGroup00-LogVol03
输出
Rounding size to boundary between physical extents: 96.00 MiB
WARNING: Reducing active and open logical volume to 96.00 MiB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce LogVol03? [y/n]: y
Size of logical volume VolGroup00/LogVol03 changed from 2.59 TiB (84884 extents) to 96.00 MiB (3 extents).
Logical volume LogVol03 successfully resized.
看下逻辑卷信息
vgdisplay
输出
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 4
Max PV 0
Cur PV 1
Act PV 1
VG Size 2.73 TiB
PE Size 32.00 MiB
Total PE 89416
Alloc PE / Size 4515 / 141.09 GiB
Free PE / Size 84901 / 2.59 TiB
VG UUID olDTte-CLOQ-leom-Efev-UiGF-PLOI-gdIeSI
free的部分已经变成了2.59T
0x07 扩展新空间
lvextend -L +2.5T /dev/mapper/VolGroup00-LogVol00
输出
Size of logical volume VolGroup00/LogVol00 changed from 100.00 GiB (3200 extents) to 2.60 TiB (85120 extents).
Logical volume LogVol00 successfully resized.
更新文件系统
resize2fs -p /dev/mapper/VolGroup00-LogVol00
输出
resize2fs 1.42.9 (28-Dec-2013)
Filesystem at /dev/mapper/VolGroup00-LogVol00 is mounted on /; on-line resizing required
old_desc_blocks = 13, new_desc_blocks = 333
The filesystem on /dev/mapper/VolGroup00-LogVol00 is now 697303040 blocks long.
0x08 查看磁盘空间
df -lh
输出
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 2.6T 96G 2.4T 4% /
devtmpfs 63G 0 63G 0% /dev
tmpfs 63G 0 63G 0% /dev/shm
tmpfs 63G 25M 63G 1% /run
tmpfs 63G 0 63G 0% /sys/fs/cgroup
/dev/sda1 240M 86M 138M 39% /boot
/dev/mapper/VolGroup00-LogVol01 40G 365M 37G 1% /var
/dev/mapper/VolGroup00-LogVol02 976M 19M 891M 2% /tmp
tmpfs 13G 0 13G 0% /run/user/448376178
/dev/mapper/VolGroup00-LogVol03 2.6T 89M 2.5T 1% /da1
可以看到/dev/mapper/VolGroup00-LogVol00 已经变成2.4T了。
这里有个问题，/dev/mapper/VolGroup00-LogVol03居然还是2.5T,磁盘信息没有更新，实际上只有100M。
0x09 小结
LVM的磁盘灵活性比较高，可以方便的调整分区大小，方便docker使用。
0x10 参考文献
https://yq.aliyun.com/articles/140963