新添加硬盘在虚拟机里看不到 fdisk -l 不出现新硬盘。

[root@localhost ~]# echo "- - -" > /sys/class/scsi_host/host0/scan

注释：这个 scan 属性支持以 "-" 作为通配符，此命令可以执行让整个 scsi_host 进行重新搜索，这个功能用于调试某些对热挺拔实现不完善的 SCSI 驱动程序很有用。host0处是host1，还是host2，取决于 cat /proc/scsi/scsi 之后的 scsi 驱动器的号。

[root@localhost ~]# fdisk /dev/sdb

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): m

Command 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)

Command (m for help): n

Command action

   e   extended

   p   primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-1044, default 1):

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-1044, default 1044):

Using default value 1044

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

[root@CentOS-20121026 ~]# fdisk -l

Disk /dev/sda: 17.2 GB, 17179869184 bytes

255 heads, 63 sectors/track, 2088 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x000c8982

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1               1         256     2048000   82  Linux swap / Solaris

Partition 1 does not end on cylinder boundary.

/dev/sda2   *         256        2089    14728192   83  Linux

Disk /dev/sdb: 8589 MB, 8589934592 bytes

255 heads, 63 sectors/track, 1044 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x046126c7

   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1        1044     8385898+  83  Linux

[root@CentOS-20121026 ~]# mkfs -t ext4 -c /dev/sdb1

mke2fs 1.41.12 (17-May-2010)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

524288 inodes, 2096474 blocks

104823 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=2147483648

64 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

Checking for bad blocks (read-only test): done

Writing inode tables: done

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 27 mounts or

180 days, whichever comes first.  Use tune2fs -c or -i to override.

[root@CentOS-20121026 ~]# mkdir /new_disk

[root@CentOS-20121026 ~]# mount /dev/sdb1 /new_disk/

修改/etc/fstab文件添加如下记录使系统每次重启后都能自动加载该分区

执行命令 或 编辑 /etc/fstab

echo `blkid /dev/sdb1 | awk '{print $2}' | sed 's/\"//g'` /new_disk ext4 defaults 0 0 >> /etc/fstab

[root@CentOS-20121026 ~]# vi /etc/fstab

在文件末尾添加以下内容

/dev/sdb1               /new_disk               ext4    defaults        0 0