Linux - lvm逻辑卷的操作

执行 lsblk如下所示：

[root@idc-poc-60 ~]# lsblk
NAME                           MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sr0                             11:0    1   3.7G  0 rom
sdb                              8:16   0   200G  0 disk
sda                              8:0    0   600G  0 disk
├─sda1                           8:1    0   500M  0 part /boot
└─sda2                           8:2    0 599.5G  0 part
  ├─vg_idcpoc60-lv_root (dm-0) 253:0    0    50G  0 lvm  /
  ├─vg_idcpoc60-lv_swap (dm-1) 253:1    0  23.1G  0 lvm  [SWAP]
  └─vg_idcpoc60-lv_home (dm-2) 253:2    0 526.4G  0 lvm  /home
sdc                              8:32   0   200G  0 disk
sdd                              8:48   0   200G  0 disk
[root@idc-poc-60 ~]#

/dev/sda 的分区 /dev/sda2 有逻辑卷 vg_idcpoc60-lv_root、vg_idcpoc60-lv_swap、vg_idcpoc60-lv_home

现有需求：将 home 的526.4G 拿出300G出来，给根目录200G，100G给/var/log，操作如下：

1、执行blkid可以获取到逻辑卷vg_idcpoc60-lv_home对应的目录

[root@idc-poc-60 ~]# blkid
/dev/mapper/vg_idcpoc60-lv_root: UUID="5cfa9083-7e14-4d36-8603-899223b22656" TYPE="ext4"
/dev/sda1: UUID="44dfc256-4543-4751-afe0-357e21a049b0" TYPE="ext4"
/dev/sda2: UUID="mlr7WF-xkV7-f4Z3-lq0X-X1YT-A9yj-cOKTzH" TYPE="LVM2_member"
/dev/mapper/vg_idcpoc60-lv_swap: UUID="19180ea2-aaca-410c-9309-f8ffe397e8ee" TYPE="swap"
/dev/mapper/vg_idcpoc60-lv_home: UUID="e8a17152-4694-4d39-addc-9462f0888d7d" TYPE="ext4"
/dev/sdb1: UUID="1e9ae322-1c6a-44ad-8467-6ccbd1a7de6f" TYPE="ext4"
/dev/sdd1: UUID="c40b32c6-7842-4eee-886f-3db86f4641bc" TYPE="ext4"
/dev/sdc1: UUID="46eac5ad-61e4-4900-8a06-c8c618eb4da6" TYPE="ext4"
[root@idc-poc-60 ~]#

2、将home的526.4G拿出300G

[root@idc-poc-60 ~]# lvresize -L -300G /dev/mapper/vg_idcpoc60-lv_home
  WARNING: Reducing active and open logical volume to 226.43 GiB.
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce vg_idcpoc60/lv_home? [y/n]: y
  Size of logical volume vg_idcpoc60/lv_home changed from 526.43 GiB (134766 extents) to 226.43 GiB (57966 extents).
  Logical volume lv_home successfully resized.

3、给根目录分200G

[root@idc-poc-60 ~]# lvresize -L +200G /dev/mapper/vg_idcpoc60-lv_root
  Size of logical volume vg_idcpoc60/lv_root changed from 50.00 GiB (12800 extents) to 250.00 GiB (64000 extents).
  Logical volume lv_root successfully resized.

4、 创建逻辑卷vg_idcpoc60-lv_varlog，并给100G空间

[root@idc-poc-60 ~]# lvcreate -L 100G -n lv_varlog /dev/mapper/vg_idcpoc60
  Logical volume "lv_varlog" created.

5、调整之后，lsblk结果如下

[root@idc-poc-60 ~]# lsblk
NAME                             MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sr0                               11:0    1   3.7G  0 rom
sdb                                8:16   0   200G  0 disk
sda                                8:0    0   600G  0 disk
├─sda1                             8:1    0   500M  0 part /boot
└─sda2                             8:2    0 599.5G  0 part
  ├─vg_idcpoc60-lv_root (dm-0)   253:0    0   250G  0 lvm  /
  ├─vg_idcpoc60-lv_swap (dm-1)   253:1    0  23.1G  0 lvm  [SWAP]
  ├─vg_idcpoc60-lv_home (dm-2)   253:2    0 226.4G  0 lvm  /home
  └─vg_idcpoc60-lv_varlog (dm-3) 253:3    0   100G  0 lvm
sdc                                8:32   0   200G  0 disk
sdd                                8:48   0   200G  0 disk

6、但是执行df -h发现根目录还是50G、home目录是526.4G，根目录执行以下命令

[root@idc-poc-60 home]# resize2fs /dev/mapper/vg_idcpoc60-lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/vg_idcpoc60-lv_root is mounted on /; on-line resizing required
old desc_blocks = 4, new_desc_blocks = 16
Performing an on-line resize of /dev/mapper/vg_idcpoc60-lv_root to 65536000 (4k) blocks.

7、home目录是缩容，需要先卸载（umount），然后需要格式化，再挂载

[root@idc-poc-60 ~]# umount /dev/mapper/vg_idcpoc60-lv_home
[root@idc-poc-60 ~]# mkfs.ext4 /dev/mapper/vg_idcpoc60-lv_home
...
[root@idc-poc-60 ~]# mount /dev/mapper/vg_idcpoc60-lv_home /home

8、varlog逻辑卷需要格式化后挂载

[root@idc-poc-60 transwarp]# mkfs.ext4 /dev/mapper/vg_idcpoc60-lv_varlog
mke2fs 1.41.12 (17-May-2010)
Discarding device blocks: done
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
6553600 inodes, 26214400 blocks
1310720 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
800 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872

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

This filesystem will be automatically checked every 26 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
[root@idc-poc-60 transwarp]#

9、可以执行blkid，使用uuid在/etc/fstab中进行配置，然后执行mount -a可以自动挂载

10、最终结果如下

[root@idc-poc-60 transwarp]# lsblk
NAME                             MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sr0                               11:0    1   3.7G  0 rom
sda                                8:0    0   600G  0 disk
├─sda1                             8:1    0   500M  0 part /boot
└─sda2                             8:2    0 599.5G  0 part
  ├─vg_idcpoc60-lv_root (dm-0)   253:0    0   250G  0 lvm  /
  ├─vg_idcpoc60-lv_swap (dm-1)   253:1    0  23.1G  0 lvm  [SWAP]
  ├─vg_idcpoc60-lv_home (dm-2)   253:2    0 226.4G  0 lvm  /home
  └─vg_idcpoc60-lv_varlog (dm-3) 253:3    0   100G  0 lvm  /var/log
sdb                                8:16   0   200G  0 disk
└─sdb1                             8:17   0   200G  0 part /mnt/disk1
sdd                                8:48   0   200G  0 disk
└─sdd1                             8:49   0   200G  0 part /mnt/disk2
sdc                                8:32   0   200G  0 disk
└─sdc1                             8:33   0   200G  0 part /mnt/disk3
[root@idc-poc-60 transwarp]#

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