扩容数据盘_Linux[通俗易懂]

umount /dev/vdb1

[root@lcoalhost /]# umount /dev/sdc1
umount: /data1: target is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

[root@localhost /]# fuser -m /dev/sdc1
-bash: fuser: command not found

yum install -y psmisc

[root@localhost /]# fuser -m /dev/sdc1
/dev/sdc1:           12766c
[root@localhost /]# ps aux | grep 12766
root     10246  0.0  0.0 116460  3212 pts/0    Ss+  Oct19   0:00 -bash

kill -9 12766

df -h

1，fdisk -l
2，fdisk 【‘数据盘设备名’】
输入d		--删除原来的分区
输入n		--开始创建新的分区
输入p		--开始创建新的分区。		
输入1		--创建主分区。
输入第一个可用的扇区编号：为了保证数据的一致性，First sector需要与原来的分区保持一致。在本示例中，按回车键采用默认值。
输入最后一个扇区编号：因为这里仅创建一个分区，所以按回车键采用默认值。
输入wq并按回车键，开始分区。

--------------------------------demo---------------------------
fdisk /dev/vdb
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): d
Selected partition 1
Partition 1 is deleted
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-62914559, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-62914559, default 62914559):
Using default value 62914559
Partition 1 of type Linux and of size 30 GiB is set
Command (m for help): wq
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)

[root@localhost ~]# partprobe
-d：不更新内核；
-s：显示摘要和分区；
-h：显示帮助信息；
-v：显示版本信息。

Error: Error informing the kernel about modifications to partition /dev/vdb1 
-- Device or resource busy.  
This means Linux won't know about any changes you made to /dev/vdb1 until you reboot
 -- so you shouldn't mount it or use it in any way before rebooting.
Error: Failed to add partition 1 (Device or resource busy)
错误：通知内核修改分区/DEV/VBD1的错误-设备或资源忙。
这意味着在重新启动之前，Linux不会知道对/dev/vdb1所做的任何更改——因此在重新启动之前，不应该以任何方式挂载或使用它。
错误：添加分区1失败（设备或资源忙）

df -h 查看是否挂载    如果挂载，执行umount /dev/vdb1

e2fsck -f /dev/vdb1 # 检查文件系统
resize2fs /dev/vdb1 # 变更文件系统大小

使用 e2fsck 时，由于系统需要检查并订正文件系统元数据，所以速度较慢、耗时较长，请耐心等待。
正确使用 e2fsck 和 resize2fs 指令，不会造成原有数据丢失。

root@iXXXXXX ~]# e2fsck -f /dev/vdb1
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/vdb1: 11/1835008 files (0.0% non-contiguous), 159218/7339776 blocks
[root@iXXXXXX ~]# resize2fs /dev/vdb1
resize2fs 1.42.9 (28-Dec-2013)
Resizing the filesystem on /dev/vdb1 to 7864064 (4k) blocks.
The filesystem on /dev/vdb1 is now 7864064 blocks long.

mount /dev/vdb1 /kdata