mount: /dev/sdxx already mounted or /xxxx busy解决方法

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异常现象:

技术图片

解决方法:

1.    輸入root的密碼,進入單用戶
2.    重新掛載/目錄,使其變為可讀可寫

# mount –o rw,remount /

3.    修改/etc/fstab文件,注釋掉sdb
  這個sdb是存儲直連服務器的

# vi /etc/fstab
-----------------------------------------------------------------------------------------------------------
#/dev/sdb1      /D37data01              ext4    defaults        1 2
#/dev/sdb2      /D37data02              ext4    defaults        1 2
-----------------------------------------------------------------------------------------------------------

4.    重啟服務器

# reboot

5.    進入系統,掛載文件

# mount /dev/sdb1 / D37data01

  此時,報錯如下

-----------------------------------------------------------------------------------------------------------
mount: /dev/sdb1 already mounted or /D37data01 busy
-----------------------------------------------------------------------------------------------------------

6.    執行第5步報錯是因為sdb1被其他程式佔用

# dmsetup status
-----------------------------------------------------------------------------------------------------------
執行后,顯示類似下邊的輸出。此次異常輸出沒有保存,但是顯示的是multipath程式佔用
ResultFromHadoop-ResultFromHadoop: 0 3907026944 linear
ResultFromHadoop-ResultFromHadoop: 3907026944 3907026944 linear
ResultFromHadoop-ResultFromHadoop: 7814053888 3907026944 linea
-----------------------------------------------------------------------------------------------------------
# dmsetup remove_all(此命令解除佔用)
# dmsetup status(再次查看,沒有輸出,說明已經沒有佔用)

7.    再次掛載

# mount /dev/sdb1 / D37data01
# mount /dev/sdb2 /D37data02

8.    打開數據庫
9.    卸載multipath
  配置好yum

# yum remove device-mapper-multipath
# yum remove device-mapper-multipath-libs

10.    修改/etc/fatab,取消sdb的注釋







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