Linux格式化分割槽報錯Could not start /dev/sda No such file or directory 解決辦法

Linux檢視已經分好的區
[root@linuxidc ~]# fdisk -l /dev/sda 

Disk /dev/sda: 21.5 GB, 21474836480 bytes 

255 heads, 63 sectors/track, 2610 cylinders 
Units = cylinders of 16065 * 512 = 8225280bytes 
Sector size (logical/physical): 512 bytes /512 bytes 
I/O size (minimum/optimal): 512 bytes / 512bytes 
Disk identifier: 0x7d57cb1f 
  
  Device Boot      Start        End      Blocks  Id  System 
/dev/sda1              1        2610  20964793+  5  Extended 
/dev/sda5              1        128    1028097  83  Linux 
/dev/sda6            129        256    1028128+  83  Linux 
/dev/sda7            257        384    1028128+  83  Linux

格式化新分割槽的時候，報錯，提示下面的錯誤，沒有這個檔案或目錄。

Could not stat /dev/sda7 --- No such fileor directory
The device apparently does not exist; didyou specify it correctly?

[root@linuxidc ~]# mke2fs -t ext4 /dev/sda7 
mke2fs 1.41.12 (17-May-2010) 
Could not stat /dev/sda7 --- No such fileor directory 
  
The device apparently does not exist; didyou specify it correctly?

解決方法：執行partprobe 命令
partprobe包含在parted的rpm軟體包中。
partprobe可以修改kernel中分割槽表，使kernel重新讀取分割槽表。 
因此，使用該命令就可以建立分割槽並且在不重新啟動機器的情況下系統能夠識別這些分割槽。
 
檢視是否安裝過該命令：
[root@linuxidc~]# rpm -q parted 
packageparted is not installed

提示沒有安裝過，則需要安裝parted
安裝命令：#yum install parted #前提是保證你的虛擬機器可以上網，要從網路下載安裝包
[root@linuxidc~]# yum install parted

 Loadedplugins: fastestmirror
1234567 Loadingmirror speeds from cached hostfile 
 * base: mirrors.skyshe.cn 
 * extras: mirrors.skyshe.cn 
 * updates: mirrors.skyshe.cn 
base                                                | 3.7 kB    00:00      
extras                                                |3.3 kB    00:00      
updates                                              | 3.4 kB    00:00

Settingup Install Process 
ResolvingDependencies 
-->Running transaction check 
--->Package parted.i686 0:2.1-25.el6 will be installed 
-->Finished Dependency Resolution 
  
DependenciesResolved 
  
============================================================================= 
 Package          Arch          Version                Repository      Size 
============================================================================= 
Installing: 
 parted          i686          2.1-25.el6            base          595 k 
  
TransactionSummary 
============================================================================= 
Install      1 Package(s) 
  
Totaldownload size: 595 k 
Installedsize: 2.1 M 
Isthis ok [y/N]: y 
DownloadingPackages: 
parted-2.1-25.el6.i686.rpm                            | 595 kB    00:16      
Runningrpm_check_debug 
RunningTransaction Test 
TransactionTest Succeeded 
RunningTransaction 
  Installing : parted-2.1-25.el6.i686                                    1/1 
  Verifying : parted-2.1-25.el6.i686                                  1/1 
  
Installed: 
  parted.i686 0:2.1-25.el6                                                  
  
Complete!

安裝完成後，再進行查詢一次，已經安裝成功。
[root@linuxidc~]# rpm -q parted 
parted-2.1-25.el6.i686

執行一下該命令：
[root@linuxidc~]# partprobe 
Warning:WARNING: the kernel failed to re-read the partition table on /dev/sda (Deviceor resource busy).  As a result, it maynot reflect all of your changes until after reboot. 
Warning:WARNING: the kernel failed to re-read the partition table on /dev/sdb (Deviceor resource busy).  As a result, it maynot reflect all of your changes until after reboot. 
Warning:Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0 has been opened read-only. 
Warning:Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0 has been opened read-only. 
Error:Invalid partition table - recursive partition on /dev/sr0.

然後執行格式化，就OK了，如果還提示出錯，重啟之後再執行格式化就可以了。
[root@linuxidc~]# mkfs -t ext4 /dev/sda7 
mke2fs1.41.12 (17-May-2010) 
Filesystemlabel= 
OStype: Linux 
Blocksize=4096 (log=2) 
Fragmentsize=4096 (log=2) 
Stride=0blocks, Stripe width=0 blocks 
64384inodes, 257032 blocks 
12851blocks (5.00%) reserved for the super user 
Firstdata block=0 
Maximumfilesystem blocks=264241152 
8block groups
32768blocks per group, 32768 fragments per group 
8048inodes per group 
Superblockbackups stored on blocks:  
    32768, 98304, 163840, 229376 
  
Writinginode tables: done                          
Creatingjournal (4096 blocks): done
Writingsuperblocks and filesystem accounting information: done
  
Thisfilesystem will be automatically checked every 35 mounts or 
180days, whichever comes first.  Use tune2fs-c or -i to override.