fdisk创建分区

1.查看分区表

[root@server8 ~]# cat /proc/partitions
major minor  #blocks  name

 252        0    8388608 vda
 252        1     512000 vda1
 252        2    7875584 vda2
 252       16    5242880 vdb
 252       17     204800 vdb1
 253        0    6856704 dm-0
 253        1    1015808 dm-1
 253        2     202752 dm-2

查看vdb

[root@server8 ~]# fdisk -cul /dev/vdb

Disk /dev/vdb: 5368 MB, 5368709120 bytes
7 heads, 6 sectors/track, 249660 cylinders, total 10485760 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 identifier: 0x748cfa01

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1            2048      411647      204800   83  Linux

 

[root@server8 ~]# fdisk -cu /dev/vdb

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 2
First sector (411648-10485759, default 411648):
Using default value 411648
Last sector, +sectors or +size{K,M,G} (411648-10485759, default 10485759): +200M

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

Calling ioctl() to re-read partition table.

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)
Syncing disks.

 

[root@server8 ~]# init 6
[root@server8 ~]# cat /proc/partitions
major minor  #blocks  name

 252        0    8388608 vda
 252        1     512000 vda1
 252        2    7875584 vda2
 252       16    5242880 vdb
 252       17     204800 vdb1
 252       18     204800 vdb2
 253        0    6856704 dm-0
 253        1    1015808 dm-1

 

mkdir /test
[root@server8 ~]# vi /etc/fstab
/dev/vdb2  /test  ext4 defaults  0 0

 [root@server8 ~]# mount -a
 OK,