[root@oracle ~]# fdisk -lDisk /dev/sdb: 21.5 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000Disk /dev/sda: 21.5 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x0006b59c   Device Boot      Start         End      Blocks   Id  System/dev/sda1   *           1          39      307200   83  LinuxPartition 1 does not end on cylinder boundary./dev/sda2              39        2358    18631680   83  Linux/dev/sda3            2358        2611     2031616   82  Linux swap / Solaris

[root@oracle ~]# fdisk /dev/sdb Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabelBuilding a new DOS disklabel with disk identifier 0x09f38795.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): mCommand action   a   toggle a bootable flag   b   edit bsd disklabel   c   toggle the dos compatibility flag   d   delete a partition   l   list known partition types   m   print this menu   n   add a new partition   o   create a new empty DOS partition table   p   print the partition table   q   quit without saving changes   s   create a new empty Sun disklabel   t   change a partition's system id   u   change display/entry units   v   verify the partition table   w   write table to disk and exit   x   extra functionality (experts only)

  1. 输入 m 显示所有命令列示。

　　2. 输入 p 显示硬盘分割情形，打印分区表。

　　3. 输入 a 设定硬盘启动区。

　　4. 输入 n 创建新的硬盘分割区。

　　　　4.1. 输入 e 硬盘为[延伸]分割区(extend)。

　　　　4.2. 输入 p 硬盘为[主要]分割区(primary)。

　　5. 输入 t 改变硬盘分割区属性。　　　　　　　　　　

　　6. 输入 d 删除硬盘分割区属性。

　　7. 输入 q 结束不存入硬盘分割区属性。

　　8. 输入 w 结束并写入硬盘分割区属性

Command (m for help): nCommand action   e   extended                                                                   ···扩展分区   p   primary partition (1-4)                                                    ···主分区pPartition number (1-4): 1First cylinder (1-2610, default 1): Using default value 1Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): Using default value 2610

Command (m for help): pDisk /dev/sdb: 21.5 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x09f38795   Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1        2610    20964793+  83  LinuxCommand (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.Syncing disks.

[root@oracle ~]# mkfs.ext4  /dev/sdb1mkfs.ext4: invalid fragment size - /dev/sdb1

[root@oracle ~]# mount /dev/sdb1 /oracle/You have new mail in /var/spool/mail/root[root@oracle ~]# df -THFilesystem     Type   Size  Used Avail Use% Mounted on/dev/sda2      ext4    19G   11G  7.3G  60% /tmpfs          tmpfs  2.1G   74k  2.1G   1% /dev/shm/dev/sda1      ext4   297M   29M  253M  11% /boot/dev/sdb1       ext4    22G   47M   20G   1% /oracle

/dev/sdb1        /oracle          ext4   defaults,noatime        0 0