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最新推荐文章于 2025-03-04 21:30:59 发布

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#linux #centos #lvm #运维

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本文详细介绍了在Linux系统中如何扩展磁盘分区，创建物理卷，将其添加到卷组，并扩展逻辑卷。通过使用fdisk、pvcreate、vgextend、lvextend和resize2fs等命令，成功将新磁盘空间整合到根目录的文件系统中，解决了磁盘空间不足的问题。在过程中遇到了resize2fs的错误，通过确认文件系统类型为xfs并使用xfs_growfs命令解决了问题。

新加一块磁盘，我的是sdb

# fdisk /dev/sdb

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel

Building a new DOS disklabel with disk identifier 0xce359e4e.

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) 

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

         switch off the mode (command 'c') and change display units to

         sectors (command 'u'). 

Command (m for help): n

Command action

   e   extended

   p   primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-261, default 1): （回车，默认将所有空间分配给第一个主分区）

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-261, default 261): 

Using default value 261

Command (m for help): t（修改磁盘格式为LVM）

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.

将新创建的主分区创建为物理卷

# pvcreate /dev/sdb1

Writing physical volume data to disk "/dev/sdb1"
Physical volume "/dev/sdb1" successfully created

查看根目录所属的卷组和逻辑卷

#df -h

文件系统                   容量  已用   可用    已用%    挂载点
/dev/mapper/centos-root   14G  1.8G   12G     13%      /

将刚创建的物理卷/dev/sdb1添加到卷组中

# vgextend centos /dev/sdb1
Volume group "centos" successfully extended

将卷组的50GB扩展给根所在的逻辑卷

# lvextend -L +50G /dev/mapper/centos-root

Logical volume lv_root successfully resized

激活修改的配置

# resize2fs /dev/mapper/centos-root

查看磁盘状态

# df -h

Linux resize2fs: Bad magic number in super-block错误的解决方法

执行resize2fs报错

# resize2fs /dev/mapper/centos-root
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block 当尝试打开 /dev/mapper/centos-home 时
找不到有效的文件系统超级块

确认文件系统是xfs