[rhel6.5]在线根分区卷组扩展

你的名字 2022-05-31 11:41 188阅读 0赞

*  **实验环境**
    
    > 操作系统类型 `rhel6.5`  
    > `KVM`类型的虚拟机
 *  **必须要注意的一点是,根分区必须是使用可扩展的LVM卷组的方式进行挂载的**
 *  使用命令`df -h`进行查看

[root@server6 ~]# df -h
    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root 18G 9.4G 7.1G 57% /
    tmpfs                         487M     0  487M   0% /dev/shm
    /dev/vda1                     485M   33M  427M   8% /boot

![这里写图片描述][70]

*  首先需要添加一块硬盘  
    ![这里写图片描述][70 1]

![这里写图片描述][70 2]

*  使用命令查看新增加的硬盘,大小为`8G`;

[root@server6 ~]# fdisk -l

![这里写图片描述][70 3]

*  **重点内容**
 *  执行划分分区的命令,需要调整类型为**8e**

[root@server6 ~]# fdisk -cu /dev/vdc 
    Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
    Building a new DOS disklabel with disk identifier 0xadcf4a9d.
    Changes will remain in memory only, until you decide to write them.
    After that, of course, the previous content won't be recoverable.
    
    Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
    
    Command (m for help): n
    Command action
       e   extended
       p   primary partition (1-4)
    p
    Partition number (1-4): 1
    First sector (2048-16777215, default 2048): 
    Using default value 2048
    Last sector, +sectors or +size{K,M,G} (2048-16777215, default 16777215): 
    Using default value 16777215
    
    Command (m for help): t
    Selected partition 1
    Hex code (type L to list codes): 8e
    Changed system type of partition 1 to 8e (Linux LVM)
    
    Command (m for help): w
    The partition table has been altered!
    
    Calling ioctl() to re-read partition table.
    Syncing disks.

*  通知内核重新读取分区表

[root@server6 ~]# partx /dev/vdc
    # 1: 2048- 16777215 ( 16775168 sectors, 8588 MB)
    # 2: 0- -1 ( 0 sectors, 0 MB)
    # 3: 0- -1 ( 0 sectors, 0 MB)
    # 4: 0- -1 ( 0 sectors, 0 MB)

*  首先制作’Physical Volume’

[root@server6 ~]# pvcreate /dev/vdc1 
      Physical volume "/dev/vdc1" successfully created

*  使用命令`pvs`进行查看  
    ![这里写图片描述][70 4]
 *  将制作好的加入到卷组里面

[root@server6 ~]# vgextend VolGroup /dev/vdc1 
      Volume group "VolGroup" successfully extended

*  通过命令`vgs`查看卷组的大小改变  
    ![这里写图片描述][70 5]
 *  扩展逻辑卷组边界

[root@server6 ~]# lvextend -L +8G /dev/VolGroup/lv_root 
      Extending logical volume lv_root to 25.61 GiB
      Insufficient free space: 2048 extents needed, but only 2047 available
    [root@server6 ~]# lvextend -l +2047 /dev/VolGroup/lv_root 
      Extending logical volume lv_root to 25.60 GiB
      Logical volume lv_root successfully resized

*  执行逻辑卷组的边界扩展

[root@server6 ~]# resize2fs /dev/VolGroup/lv_root
    resize2fs 1.41.12 (17-May-2010)
    Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required
    old desc_blocks = 2, new_desc_blocks = 2
    Performing an on-line resize of /dev/VolGroup/lv_root to 6711296 (4k) blocks.
    The filesystem on /dev/VolGroup/lv_root is now 6711296 blocks long.

*  通过`df -h`来查看最后结果的改变

[root@server6 ~]# df -h
    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root 26G 9.4G 15G 40% /
    tmpfs                         487M     0  487M   0% /dev/shm
    /dev/vda1                     485M   33M  427M   8% /boot

*  前后大小进行对比的截图  
    ![这里写图片描述][70 6]

[70]: /images/20220531/fcf9e5cef1b54075b43909832e81c6a9.png
[70 1]: /images/20220531/1ed282b5ce26415d992735fe6e58ff6a.png
[70 2]: /images/20220531/95862886169d4bc5b514a13f149c1eff.png
[70 3]: /images/20220531/038bd860886340889ad6b88c75e1d549.png
[70 4]: /images/20220531/11632fcafe7149cdbc4a4798f4e88b5a.png
[70 5]: /images/20220531/fb99bf67c7ed4e6c88ea45aacd3462c5.png
[70 6]: /images/20220531/774e8dd001674a7da9e3efd0da354c29.png