阿里云磁盘的分区，挂载

系统故障，刚好有个阿里云的磁盘。  

  1.格式化分区，挂载

  2.将重要文件备份到数据盘。

  3. 卸载数据盘

  4. 重做系统盘

   5. 再挂载数据盘。 备份文件依然存在。

格式化分区+挂载 :

[root@testserver ~]# fdisk -l


Disk /dev/xvda: 42.9 GB, 42949672960 bytes, 83886080 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    83884031    41940992   83  Linux


Disk /dev/xvdb: 536.9 GB, 536870912000 bytes, 1048576000 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: 0xa3bf84e1


    Device Boot      Start         End      Blocks   Id  System
/dev/xvdb1            2048  1048575999   524286976   83  Linux


[root@testserver ~]# mkfs
mkfs         mkfs.btrfs   mkfs.cramfs  mkfs.ext2    mkfs.ext3    mkfs.ext4    mkfs.fat     mkfs.minix   mkfs.msdos   mkfs.vfat    mkfs.xfs
[root@testserver ~]# mkfs
mkfs         mkfs.btrfs   mkfs.cramfs  mkfs.ext2    mkfs.ext3    mkfs.ext4    mkfs.fat     mkfs.minix   mkfs.msdos   mkfs.vfat    mkfs.xfs
[root@testserver ~]# mkfs /dev/xvdb1
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
32768000 inodes, 131071744 blocks
6553587 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
4000 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, 71663616, 78675968,
        102400000


Allocating group tables: done
Writing inode tables: done
Writing superblocks and filesystem accounting information: done


[root@testserver ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1       40G   17G   21G  45% /
devtmpfs        3.9G     0  3.9G   0% /dev
tmpfs           3.7G     0  3.7G   0% /dev/shm
tmpfs           3.7G  8.4M  3.7G   1% /run
tmpfs           3.7G     0  3.7G   0% /sys/fs/cgroup


[root@testserver ~]# mount /dev/xvdb1 /tmp/xdb1/
[root@testserver ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1       40G   17G   21G  45% /
devtmpfs        3.9G     0  3.9G   0% /dev
tmpfs           3.7G     0  3.7G   0% /dev/shm
tmpfs           3.7G  8.4M  3.7G   1% /run
tmpfs           3.7G     0  3.7G   0% /sys/fs/cgroup
/dev/xvdb1      493G   70M  468G   1% /tmp/xdb1
[root@testserver ~]#

卸载：  

umount  /dev/xvdb1