RHEL5 创建裸设备RAW

2019年10月3日14:09:12
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1. 创建分区

[root@ www.linuxidc.com ~]# fdisk /dev/sda
Command (m for help): p

Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        3916    31455238+  83  Linux
/dev/sda2            3917        4438     4192965   82  Linux swap / Solaris
/dev/sda3            4439        4960     4192965   83  Linux

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)

p

First cylinder (4961-5221, default 4961): 

Last cylinder or +size or +sizeM or +sizeK (4961-5221, default 5221): +20m      

Command (m for help): p

Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        3916    31455238+  83  Linux
/dev/sda2            3917        4438     4192965   82  Linux swap / Solaris
/dev/sda3            4439        4960     4192965   83  Linux
/dev/sda4            4961        4963       24097+  83  Linux

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.
Syncing disks.

partprobe 
Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0 has been opened read-only.
Segmentation fault

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