根据官方的磁盘扩容教程，看我怎样把主机弄挂的

不知道问题出在哪里，小白~~






Xshell 5 (Build 0556)
Copyright (c) 2002-2015 NetSarang Computer, Inc. All rights reserved.


Type `help' to learn how to use Xshell prompt.
[e:\~]$


Connecting to 121.199.9.252:1984...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.


Last login: Tue Apr 28 08:52:12 2015 from 125.120.153.219


Welcome to aliyun Elastic Compute Service!


[root@AY13052909 ~]# df -lh
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1       20G  2.9G   16G  16% /
devtmpfs        488M     0  488M   0% /dev
tmpfs           497M     0  497M   0% /dev/shm
tmpfs           497M  6.5M  490M   2% /run
tmpfs           497M     0  497M   0% /sys/fs/cgroup
/dev/xvdb1       20G  1.6G   18G   9% /idata
[root@AY13052909 ~]# /etc/init.d/nginx stop
Stopping nginx!
[root@AY13052909 ~]# /etc/init.d/mysqld stop
Shutting down MySQL..                                      [  OK  ]
[root@AY13052909 ~]# /etc/init.d/php-fpm stop
Gracefully shutting down php-fpm . done
[root@AY13052909 ~]# systemctl stop vsftpd.service
[root@AY13052909 ~]# umount /idata
[root@AY13052909 ~]# df -lh
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1       20G  2.9G   16G  16% /
devtmpfs        488M     0  488M   0% /dev
tmpfs           497M     0  497M   0% /dev/shm
tmpfs           497M  6.5M  490M   2% /run
tmpfs           497M     0  497M   0% /sys/fs/cgroup
[root@AY13052909 ~]# fdisk /dev/xvdb
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): p
Partition number (1-4, default 1): 1
First sector (2048-58720255, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-58720255, default 58720255):
Using default value 58720255
Partition 1 of type Linux and of size 28 GiB is set


Command (m for help): wq
The partition table has been altered!


Calling ioctl() to re-read partition table.
Syncing disks.
[root@AY13052909 ~]# e2fsck -f /dev/xvdb1
e2fsck 1.42.9 (28-Dec-2013)
ext2fs_open2: Bad magic number in super-block
e2fsck: Superblock invalid, trying backup blocks...
e2fsck: Bad magic number in super-block while trying to open /dev/xvdb1


The superblock could not be read or does not describe a correct ext2
filesystem.  If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>


[root@AY13052909 ~]# resize2fs /dev/xvdb1
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/xvdb1
Couldn't find valid filesystem superblock.
[root@AY13052909 ~]# df -lh
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1       20G  2.9G   16G  16% /
devtmpfs        488M     0  488M   0% /dev
tmpfs           497M     0  497M   0% /dev/shm
tmpfs           497M  6.5M  490M   2% /run
tmpfs           497M     0  497M   0% /sys/fs/cgroup
[root@AY13052909 ~]# fdisk -l


Disk /dev/xvda: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0009e68a


    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *        2048    41943039    20970496   83  Linux


Disk /dev/xvdb: 30.1 GB, 30064771072 bytes, 58720256 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x1aced61c


    Device Boot      Start         End      Blocks   Id  System
/dev/xvdb1            2048    58720255    29359104   83  Linux