Linux 执行partprobe命令时遇到Unable to open /dev/sr0 read-write (Read-only file system)

在使用fdisk创建分区时，我们会使用partprobe命令可以使kernel重新读取分区信息，从而避免重启系统，但是有时候会遇到下面错误信息“Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only.”，如下所示：

[root@getlnx14test scsi_device]# fdisk /dev/sde

The number of cylinders for this disk is set to 19581.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): p

Disk /dev/sde: 161.0 GB, 161061273600 bytes
255 heads, 63 sectors/track, 19581 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sde1               1       15665   125829081    5  Extended
/dev/sde2           15666       17231    12578895   83  Linux
/dev/sde5               1       15665   125829049+  83  Linux

Command (m for help): n
Command action
   l   logical (5 or over)
   p   primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (17232-19581, default 17232): 17232
Last cylinder or +size or +sizeM or +sizeK (17232-19581, default 19581):
Using default value 19581

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.

[root@getlnx14test scsi_device]# partprobe
Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0 has been opened read-only.
[root@getlnx14test scsi_device]#

其实不要担心和紧张， /dev/sr0是你的光驱（CD Drive），因为你运行partprobe时没有指定设备，所以它会检查所有的块设备（block devices），由于光驱是read-only，所以报上述告警信息，其实避免这个错误也很简单，你只需要使用partprobe检查、扫描指定设备即可。如下所示

[root@getlnx14test scsi_device]# partprobe /dev/sde
[root@getlnx14test scsi_device]#